fix(runtime): use pass for protocol stubs

UploadsMiddleware defines only the sync `before_agent` hook. LangChain wires a
sync-only hook as `RunnableCallable(before_agent, None)`, and LangGraph's
`ainvoke` runs it directly on the event loop when `afunc is None` — so the
per-message uploads-directory scan (`exists`/`iterdir`/`stat` plus reading
sibling `.md` outlines) blocks the asyncio event loop on every message that has
an uploads directory.

Add `abefore_agent` that offloads the scan to a worker thread via
`run_in_executor`; it copies the current context, preserving the `user_id`
contextvar read by `get_effective_user_id()`.

Add a runtime anchor under `tests/blocking_io/` that drives the real
`create_agent` graph via `ainvoke` under the strict Blockbuster gate, so a
regression back onto the event loop fails CI. Update blocking-IO docs.

.agent/skills/smoke-test/SKILL.md

@@ -59,7 +59,7 @@ smoke-test/
 2. **Check pnpm** - Package manager
 3. **Check uv** - Python package manager
 4. **Check nginx** - Reverse proxy
-5. **Check required ports** - Confirm that ports 2026, 3000, 8001, and 2024 are not occupied
+5. **Check required ports** - Confirm that ports 2026, 3000, and 8001 are not occupied
 
 **Docker mode environment check** (if Docker is selected):
 1. **Check whether Docker is installed** - Run `docker --version`
@@ -93,17 +93,17 @@ smoke-test/
 ### Phase 5: Service Health Check
 
 **Local mode health check**:
-1. **Check process status** - Confirm that LangGraph, Gateway, Frontend, and Nginx processes are all running
+1. **Check process status** - Confirm that Gateway, Frontend, and Nginx processes are all running
 2. **Check frontend service** - Visit `http://localhost:2026` and verify that the page loads
 3. **Check API Gateway** - Verify the `http://localhost:2026/health` endpoint
-4. **Check LangGraph service** - Verify the availability of relevant endpoints
+4. **Check LangGraph-compatible API** - Verify the `/api/langgraph/*` route exposed by Gateway
 5. **Frontend route smoke check** - Run `bash .agent/skills/smoke-test/scripts/frontend_check.sh` to verify key routes under `/workspace`
 
 **Docker mode health check** (when using Docker):
 1. **Check container status** - Run `docker ps` and confirm that all containers are running
 2. **Check frontend service** - Visit `http://localhost:2026` and verify that the page loads
 3. **Check API Gateway** - Verify the `http://localhost:2026/health` endpoint
-4. **Check LangGraph service** - Verify the availability of relevant endpoints
+4. **Check LangGraph-compatible API** - Verify the `/api/langgraph/*` route exposed by Gateway
 5. **Frontend route smoke check** - Run `bash .agent/skills/smoke-test/scripts/frontend_check.sh` to verify key routes under `/workspace`
 
 ### Optional Functional Verification
@@ -135,7 +135,7 @@ smoke-test/
 
 The following warnings can appear during smoke testing and do not block a successful result:
 - Feishu/Lark SSL errors in Gateway logs (certificate verification failure) can be ignored if that channel is not enabled
-- Warnings in LangGraph logs about missing methods in the custom checkpointer, such as `adelete_for_runs` or `aprune`, do not affect the core functionality
+- Warnings in Gateway logs about missing methods in the custom checkpointer, such as `adelete_for_runs` or `aprune`, do not affect the core functionality
 
 ## Key Tools
 

.agent/skills/smoke-test/references/SOP.md

@@ -138,7 +138,6 @@ This document describes the detailed operating steps for each phase of the DeerF
    lsof -i :2026  # Main port
    lsof -i :3000  # Frontend
    lsof -i :8001  # Gateway
-   lsof -i :2024  # LangGraph
    ```
 
 **Success Criteria**: All ports are free, or they are occupied only by DeerFlow-related processes.
@@ -258,7 +257,7 @@ This document describes the detailed operating steps for each phase of the DeerF
 **Steps**:
 1. Run `make dev-daemon` (background mode)
 
-**Description**: This command starts all services (LangGraph, Gateway, Frontend, Nginx).
+**Description**: This command starts all services (Gateway embedded runtime, Frontend, Nginx).
 
 **Notes**:
 - `make dev` runs in the foreground and stops with Ctrl+C
@@ -272,7 +271,6 @@ This document describes the detailed operating steps for each phase of the DeerF
 **Steps**:
 1. Wait 90-120 seconds for all services to start completely
 2. You can monitor startup progress by checking these log files:
-   - `logs/langgraph.log`
    - `logs/gateway.log`
    - `logs/frontend.log`
    - `logs/nginx.log`
@@ -316,11 +314,10 @@ This document describes the detailed operating steps for each phase of the DeerF
 **Steps**:
 1. Run the following command to check processes:
    ```bash
-   ps aux | grep -E "(langgraph|uvicorn|next|nginx)" | grep -v grep
+   ps aux | grep -E "(uvicorn|next|nginx)" | grep -v grep
    ```
 
 **Success Criteria**: Confirm that the following processes are running:
-- LangGraph (`langgraph dev`)
 - Gateway (`uvicorn app.gateway.app:app`)
 - Frontend (`next dev` or `next start`)
 - Nginx (`nginx`)
@@ -356,10 +353,11 @@ curl http://localhost:2026/health
 
 ---
 
-#### 5.1.4 Check LangGraph Service
+#### 5.1.4 Check LangGraph-compatible API
 
 **Steps**:
-1. Visit relevant LangGraph endpoints to verify availability
+1. Visit `http://localhost:2026/api/langgraph/assistants/lead_agent` to verify Gateway's LangGraph-compatible API route is reachable.
+2. A `401` response is acceptable when authentication is enabled and no session cookie is provided.
 
 ---
 
@@ -373,7 +371,6 @@ curl http://localhost:2026/health
    - `deer-flow-nginx`
    - `deer-flow-frontend`
    - `deer-flow-gateway`
-   - `deer-flow-langgraph` (if not in gateway mode)
 
 ---
 
@@ -406,10 +403,11 @@ curl http://localhost:2026/health
 
 ---
 
-#### 5.2.4 Check LangGraph Service
+#### 5.2.4 Check LangGraph-compatible API
 
 **Steps**:
-1. Visit relevant LangGraph endpoints to verify availability
+1. Visit `http://localhost:2026/api/langgraph/assistants/lead_agent` to verify Gateway's LangGraph-compatible API route is reachable.
+2. A `401` response is acceptable when authentication is enabled and no session cookie is provided.
 
 ---
 

.agent/skills/smoke-test/references/troubleshooting.md

@@ -254,7 +254,6 @@ Processes exit quickly after running `make dev-daemon`.
 **Solutions**:
 1. Check log files:
    ```bash
-   tail -f logs/langgraph.log
    tail -f logs/gateway.log
    tail -f logs/frontend.log
    tail -f logs/nginx.log
@@ -367,24 +366,7 @@ Errors appear in `gateway.log`.
    uv sync
    ```
 
-4. Confirm that the LangGraph service is running normally (if not in gateway mode)
+4. Confirm that the Gateway process is running normally.
-
----
-
-### Issue: LangGraph Fails to Start
-
-**Symptoms**:
-Errors appear in `langgraph.log`.
-
-**Solutions**:
-1. Check LangGraph logs:
-   ```bash
-   tail -f logs/langgraph.log
-   ```
-
-2. Check config.yaml
-3. Check whether Python dependencies are complete
-4. Confirm that port 2024 is not occupied
 
 ---
 
@@ -519,7 +501,7 @@ Accessing `/health` returns an error or times out.
 
 2. Confirm that config.yaml exists and has valid formatting
 3. Check whether Python dependencies are complete
-4. Confirm that the LangGraph service is running normally
+4. Confirm that the Gateway process is running normally.
 
 **Solutions** (Docker mode):
 1. Check gateway container logs:
@@ -529,7 +511,7 @@ Accessing `/health` returns an error or times out.
 
 2. Confirm that config.yaml is mounted correctly
 3. Check whether Python dependencies are complete
-4. Confirm that the LangGraph service is running normally
+4. Confirm that the Gateway process is running normally.
 
 ---
 
@@ -539,7 +521,7 @@ Accessing `/health` returns an error or times out.
 
 #### View All Service Processes
 ```bash
-ps aux | grep -E "(langgraph|uvicorn|next|nginx)" | grep -v grep
+ps aux | grep -E "(uvicorn|next|nginx)" | grep -v grep
 ```
 
 #### View Service Logs
@@ -548,7 +530,6 @@ ps aux | grep -E "(langgraph|uvicorn|next|nginx)" | grep -v grep
 tail -f logs/*.log
 
 # View specific service logs
-tail -f logs/langgraph.log
 tail -f logs/gateway.log
 tail -f logs/frontend.log
 tail -f logs/nginx.log

.agent/skills/smoke-test/scripts/check_local_env.sh

@@ -65,7 +65,7 @@ if ! command -v lsof >/dev/null 2>&1; then
     echo "  Install lsof and rerun this check"
     all_passed=false
 else
-    for port in 2026 3000 8001 2024; do
+    for port in 2026 3000 8001; do
         if lsof -i :$port >/dev/null 2>&1; then
             echo "⚠  Port $port is already in use:"
             lsof -i :$port | head -2

.agent/skills/smoke-test/scripts/deploy_local.sh

@@ -54,7 +54,6 @@ echo "=========================================="
 echo ""
 echo "🌐 Access URL: http://localhost:2026"
 echo "📋 View logs:"
-echo "   - logs/langgraph.log"
 echo "   - logs/gateway.log"
 echo "   - logs/frontend.log"
 echo "   - logs/nginx.log"

.agent/skills/smoke-test/scripts/health_check.sh

@@ -76,12 +76,11 @@ if [ "$mode" = "docker" ]; then
         all_passed=false
     fi
 else
-    summary_hint="logs/{langgraph,gateway,frontend,nginx}.log"
+    summary_hint="logs/{gateway,frontend,nginx}.log"
     print_step "1. Checking local service ports..."
     check_listen_port "Nginx" 2026
     check_listen_port "Frontend" 3000
     check_listen_port "Gateway" 8001
-    check_listen_port "LangGraph" 2024
 fi
 echo ""
 
@@ -104,8 +103,8 @@ else
 fi
 echo ""
 
-echo "5. Checking LangGraph service..."
+echo "5. Checking LangGraph-compatible Gateway API..."
-check_http_status "LangGraph service" "http://localhost:2024/" "200|301|302|307|308|404"
+check_http_status "LangGraph-compatible Gateway API" "http://localhost:2026/api/langgraph/assistants/lead_agent" "200|401"
 echo ""
 
 echo "=========================================="

.agent/skills/smoke-test/templates/report.docker.template.md

@@ -78,7 +78,7 @@
 - [x] Container status - {{status_containers}}
 - [x] Frontend service - {{status_frontend}}
 - [x] API Gateway - {{status_api_gateway}}
-- [x] LangGraph service - {{status_langgraph}}
+- [x] LangGraph-compatible Gateway API - {{status_langgraph}}
 
 **Phase Status**: {{stage5_status}}
 
@@ -147,7 +147,6 @@ Commit Message: {{git_commit_message}}
 | deer-flow-nginx | {{nginx_status}} | {{nginx_uptime}} |
 | deer-flow-frontend | {{frontend_status}} | {{frontend_uptime}} |
 | deer-flow-gateway | {{gateway_status}} | {{gateway_uptime}} |
-| deer-flow-langgraph | {{langgraph_status}} | {{langgraph_uptime}} |
 
 ---
 

.agent/skills/smoke-test/templates/report.local.template.md

@@ -80,7 +80,7 @@
 - [x] Process status - {{status_processes}}
 - [x] Frontend service - {{status_frontend}}
 - [x] API Gateway - {{status_api_gateway}}
-- [x] LangGraph service - {{status_langgraph}}
+- [x] LangGraph-compatible Gateway API - {{status_langgraph}}
 
 **Phase Status**: {{stage5_status}}
 
@@ -152,7 +152,7 @@ Commit Message: {{git_commit_message}}
 | Nginx | {{nginx_status}} | {{nginx_endpoint}} |
 | Frontend | {{frontend_status}} | {{frontend_endpoint}} |
 | Gateway | {{gateway_status}} | {{gateway_endpoint}} |
-| LangGraph | {{langgraph_status}} | {{langgraph_endpoint}} |
+| Gateway LangGraph API | {{langgraph_status}} | {{langgraph_endpoint}} |
 
 ---
 
@@ -166,7 +166,7 @@ Commit Message: {{git_commit_message}}
 
 ### If the Test Fails
 1. [ ] Review references/troubleshooting.md for common solutions
-2. [ ] Check local logs: `logs/{langgraph,gateway,frontend,nginx}.log`
+2. [ ] Check local logs: `logs/{gateway,frontend,nginx}.log`
 3. [ ] Verify configuration file format and content
 4. [ ] If needed, fully reset the environment: `make stop && make clean && make install && make dev-daemon`
 

.env.example

@@ -50,6 +50,11 @@ INFOQUEST_API_KEY=your-infoquest-api-key
 # Set to "false" to disable Swagger UI, ReDoc, and OpenAPI schema in production
 # GATEWAY_ENABLE_DOCS=false
 
+# Shared internal Gateway auth token for multi-worker deployments.
+# `make up` generates and persists this automatically; set it manually only
+# when you run Gateway workers outside the bundled deploy script.
+# DEER_FLOW_INTERNAL_AUTH_TOKEN=your-shared-internal-token
+
 # ── Frontend SSR → Gateway wiring ─────────────────────────────────────────────
 # The Next.js server uses these to reach the Gateway during SSR (auth checks,
 # /api/* rewrites). They default to localhost values that match `make dev` and

.github/pull_request_template.md

@@ -0,0 +1,61 @@
+<!-- Reference a related issue with #123. Use Fixes / Closes / Resolves to
+     auto-close it on merge. Delete this line if the PR doesn't reference an issue. -->
+Fixes #
+
+## Why
+
+<!-- Why are you opening this PR? Cover two things:
+       - The trigger — what made you write this? A bug you hit, a feature you need,
+         tech debt, or a prod issue?
+       - The pain being addressed — user-facing problem, or what it unblocks.
+     For non-trivial features, please open an issue/discussion first to align on
+     scope before writing code. -->
+
+
+## What changed
+
+<!-- Describe the change from a user's / caller's perspective, not as a code diff. e.g.:
+       - "Settings now has a 'Custom endpoint' field, off by default"
+       - "Backend /api/chat gains a `stream` flag, defaults to false"
+       - "Default model changed from X to Y — existing users notice on first run" -->
+
+
+## Surface area
+
+<!-- Check every box that applies. Reviewers use this to scope the review. -->
+
+- [ ] **Frontend UI** — page / component / setting / interaction under `frontend/`
+- [ ] **Backend API** — endpoint / SSE event / request-response shape under `backend/app`
+- [ ] **Agents / LangGraph** — agent node, graph wiring, `langgraph.json`, or prompt change
+- [ ] **Sandbox** — `docker/` or sandboxed execution
+- [ ] **Skills** — change under `skills/`
+- [ ] **Dependencies** — new/upgraded entry in `backend/pyproject.toml` or `frontend/package.json` (say what it buys us)
+- [ ] **Default behavior change** — changes existing behavior without the user opting in (default model, default setting, data shape)
+- [ ] **Docs / tests / CI only** — no runtime behavior change
+
+
+## Screenshots / Recording
+
+<!-- If you checked "Frontend UI", attach screenshots showing the entry point —
+     where users discover the change — not just the feature in isolation.
+     Before/after is best for behavior changes. Short GIFs welcome. -->
+
+
+## Bug fix verification
+
+<!-- Skip (delete) this section if this PR is not a bug fix.
+
+     Bugs should be encoded as a failing test that goes red before the fix.
+     Confirm:
+       - Test path that reproduces the bug:
+       - Did it go red on `main` and green on this branch? (yes / no)
+       - If a red test wasn't cheap to write, explain why and what you did instead. -->
+
+
+## Validation
+
+<!-- What you actually ran. Run at least the checks for the area you changed:
+       Backend:   cd backend  && make lint && make test
+       Frontend:  cd frontend && pnpm format && pnpm lint && pnpm typecheck && BETTER_AUTH_SECRET=local-dev-secret pnpm build && make test
+       Frontend E2E (if you touched frontend/): cd frontend && make test-e2e -->
+

.github/workflows/backend-blocking-io-tests.yml

@@ -0,0 +1,46 @@
+name: Backend Blocking IO
+
+on:
+  push:
+    branches: ["main"]
+    paths:
+      - "backend/**"
+      - ".github/workflows/backend-blocking-io-tests.yml"
+  pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
+    paths:
+      - "backend/**"
+      - ".github/workflows/backend-blocking-io-tests.yml"
+
+concurrency:
+  group: blocking-io-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  backend-blocking-io:
+    if: github.event_name != 'pull_request' || github.event.pull_request.draft == false
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v3
+
+      - name: Install backend dependencies
+        working-directory: backend
+        run: uv sync --group dev
+
+      - name: Run blocking IO regression tests
+        working-directory: backend
+        run: make test-blocking-io

Makefile

@@ -1,6 +1,6 @@
 # DeerFlow - Unified Development Environment
 
-.PHONY: help config config-upgrade check install setup doctor dev dev-daemon start start-daemon stop up down clean docker-init docker-start docker-stop docker-logs docker-logs-frontend docker-logs-gateway
+.PHONY: help config config-upgrade check install setup doctor detect-thread-boundaries detect-blocking-io dev dev-daemon start start-daemon stop up down clean docker-init docker-start docker-stop docker-logs docker-logs-frontend docker-logs-gateway
 
 BASH ?= bash
 BACKEND_UV_RUN = cd backend && uv run
@@ -23,6 +23,8 @@ help:
 	@echo "  make config          - Generate local config files (aborts if config already exists)"
 	@echo "  make config-upgrade  - Merge new fields from config.example.yaml into config.yaml"
 	@echo "  make check           - Check if all required tools are installed"
+	@echo "  make detect-thread-boundaries - Inventory async/thread boundary points"
+	@echo "  make detect-blocking-io        - Inventory blocking IO that may block the backend event loop"
 	@echo "  make install         - Install all dependencies (frontend + backend + pre-commit hooks)"
 	@echo "  make setup-sandbox   - Pre-pull sandbox container image (recommended)"
 	@echo "  make dev             - Start all services in development mode (with hot-reloading)"
@@ -51,6 +53,12 @@ setup:
 doctor:
 	@$(BACKEND_UV_RUN) python ../scripts/doctor.py
 
+detect-thread-boundaries:
+	@$(PYTHON) ./scripts/detect_thread_boundaries.py
+
+detect-blocking-io:
+	@$(MAKE) -C backend detect-blocking-io
+
 config:
 	@$(PYTHON) ./scripts/configure.py
 

README.md

@@ -546,6 +546,15 @@ LANGFUSE_BASE_URL=https://cloud.langfuse.com
 
 If you are using a self-hosted Langfuse instance, set `LANGFUSE_BASE_URL` to your deployment URL.
 
+**Trace correlation fields.** Every agent run is annotated with Langfuse's reserved trace attributes so the Sessions and Users pages light up automatically:
+
+- `session_id` = LangGraph `thread_id` — groups every trace of the same conversation
+- `user_id` = effective user from `get_effective_user_id()` (falls back to `default` in no-auth mode)
+- `trace_name` = assistant id (defaults to `lead-agent`)
+- `tags` = `[env:<DEER_FLOW_ENV>, model:<model_name>]` (omitted when not set)
+
+These are injected into `RunnableConfig.metadata` at the graph invocation root for both the gateway path (`runtime/runs/worker.py::run_agent`) and the embedded path (`client.py::DeerFlowClient.stream`), so any LangChain-compatible callback can read them. Set `DEER_FLOW_ENV` (or `ENVIRONMENT`) to tag traces by deployment environment.
+
 #### Using Both Providers
 
 If both LangSmith and Langfuse are enabled, DeerFlow attaches both tracing callbacks and reports the same model activity to both systems.
@@ -731,6 +740,12 @@ DeerFlow has key high-privilege capabilities including **system command executio
 We welcome contributions! Please see [CONTRIBUTING.md](CONTRIBUTING.md) for development setup, workflow, and guidelines.
 
 Regression coverage includes Docker sandbox mode detection and provisioner kubeconfig-path handling tests in `backend/tests/`.
+Backend blocking-IO diagnostics are available from the repository root with
+`make detect-blocking-io`: it statically scans backend business code for
+blocking IO that may run on the backend event loop, prints a concise summary,
+and writes complete JSON findings to `.deer-flow/blocking-io-findings.json`.
+The JSON includes compact review records with `priority`, `location`,
+`blocking_call`, `event_loop_exposure`, `reason`, and `code`.
 Gateway artifact serving now forces active web content types (`text/html`, `application/xhtml+xml`, `image/svg+xml`) to download as attachments instead of inline rendering, reducing XSS risk for generated artifacts.
 
 ## License

backend/CLAUDE.md

@@ -88,18 +88,57 @@ make stop       # Stop all services
 
 **Backend directory** (for backend development only):
 ```bash
-make install    # Install backend dependencies
+make install            # Install backend dependencies
-make dev        # Run Gateway API with reload (port 8001)
+make dev                # Run Gateway API with reload (port 8001)
-make gateway    # Run Gateway API only (port 8001)
+make gateway            # Run Gateway API only (port 8001)
-make test       # Run all backend tests
+make test               # Run all backend tests
-make lint       # Lint with ruff
+make test-blocking-io   # Run strict Blockbuster runtime gate on tests/blocking_io/
-make format     # Format code with ruff
+make lint               # Lint with ruff
+make format             # Format code with ruff
 ```
 
+The `detect-blocking-io` target parses `app/`, `packages/harness/deerflow/`,
+and `scripts/` with AST. By default it reports only blocking IO candidates that
+are inside async code, reachable from async code in the same file, or reachable
+from sync-only `AgentMiddleware` before/after hooks that LangGraph can execute
+on the async graph path. It prints a concise summary and writes complete JSON
+findings to `.deer-flow/blocking-io-findings.json` at the repository root
+(both `make detect-blocking-io` from the repo root and `cd backend && make
+detect-blocking-io` resolve to the same repo-root path). JSON findings include
+`priority`, `location`, `blocking_call`, `event_loop_exposure`, `reason`, and
+`code` for model-assisted or manual review. `priority` is a deterministic
+review ordering from operation type, not proof of a bug. Bare-name same-file
+calls are resolved by function name, so duplicate helper names in one file can
+conservatively over-report async reachability. It is intentionally
+informational and is not run from CI in this round.
+
 Regression tests related to Docker/provisioner behavior:
 - `tests/test_docker_sandbox_mode_detection.py` (mode detection from `config.yaml`)
 - `tests/test_provisioner_kubeconfig.py` (kubeconfig file/directory handling)
 
+Blocking-IO runtime gate (`tests/blocking_io/`):
+- Wraps every item under `tests/blocking_io/` with a strict Blockbuster
+  context scoped to `app.*` and `deerflow.*` (see
+  `tests/support/detectors/blocking_io_runtime.py`). Any sync blocking IO
+  call whose stack passes through DeerFlow business code while running on
+  the asyncio event loop raises `BlockingError` and fails the test.
+- Regression anchors live there: `test_skills_load.py` (locks the
+  `asyncio.to_thread` offload around `LocalSkillStorage.load_skills`, fix
+  for #1917); `test_sqlite_lifespan.py` (locks the offload around
+  SQLite path resolution plus `ensure_sqlite_parent_dir`, fix for #1912);
+  `test_jsonl_run_event_store.py` (locks `JsonlRunEventStore`'s async
+  API offloading its file IO via `asyncio.to_thread`, fix #3084); and
+  `test_uploads_middleware.py` (locks `UploadsMiddleware.abefore_agent`
+  offloading the uploads-directory scan off the event loop).
+- `test_gate_smoke.py` is a meta-test asserting the gate actually catches
+  unoffloaded blocking IO and that the `@pytest.mark.allow_blocking_io`
+  opt-out works.
+- Coverage boundary: the gate only sees code that test execution actually
+  touches. Static AST coverage is a separate concern (out of scope for
+  this PR).
+- CI: runs on every PR via `.github/workflows/backend-blocking-io-tests.yml`,
+  hard-fail.
+
 Boundary check (harness → app import firewall):
 - `tests/test_harness_boundary.py` — ensures `packages/harness/deerflow/` never imports from `app.*`
 
@@ -184,6 +223,18 @@ Setup: Copy `config.example.yaml` to `config.yaml` in the **project root** direc
 
 **Config Caching**: `get_app_config()` caches the parsed config, but automatically reloads it when the resolved config path changes or the file's mtime increases. This keeps Gateway and LangGraph reads aligned with `config.yaml` edits without requiring a manual process restart.
 
+**Config Hot-Reload Boundary**: Gateway dependencies route through `get_app_config()` on every request, so per-run fields like `models[*].max_tokens`, `summarization.*`, `title.*`, `memory.*`, `subagents.*`, `tools[*]`, and the agent system prompt pick up `config.yaml` edits on the next message. `AppConfig` is intentionally **not** cached on `app.state` — `lifespan()` keeps a local `startup_config` variable for one-shot bootstrap work (logging level, channels, `langgraph_runtime` engines) and passes it explicitly to `langgraph_runtime(app, startup_config)`. Infrastructure fields are **restart-required**:
+
+| Field | Why a restart is required |
+|---|---|
+| `database.*` | `init_engine_from_config()` runs once during `langgraph_runtime()` startup; the SQLAlchemy engine holds the connection pool. |
+| `checkpointer.*` (including SQLite WAL/journal settings) | `make_checkpointer()` binds the persistent checkpointer once at startup. |
+| `run_events.*` | `make_run_event_store()` selects memory- vs. SQL-backed implementation at startup. |
+| `stream_bridge.*` | `make_stream_bridge()` constructs the bridge object once. |
+| `sandbox.use` | `get_sandbox_provider()` caches the provider singleton (`_default_sandbox_provider`); a new class path takes effect only on next process start. |
+| `log_level` | `apply_logging_level()` is called only in `app.py` startup; it mutates the root logger's level, and `get_app_config()` returning a fresh `AppConfig` does not retrigger it. |
+| `channels.*` IM platform credentials | `start_channel_service()` is invoked once during startup; live channels are not rebuilt on config change. |
+
 Configuration priority:
 1. Explicit `config_path` argument
 2. `DEER_FLOW_CONFIG_PATH` environment variable
@@ -225,21 +276,28 @@ CORS is same-origin by default when requests enter through nginx on port 2026. S
 | **Feedback** (`/api/threads/{id}/runs/{rid}/feedback`) | `PUT /` - upsert feedback; `DELETE /` - delete user feedback; `POST /` - create feedback; `GET /` - list feedback; `GET /stats` - aggregate stats; `DELETE /{fid}` - delete specific |
 | **Runs** (`/api/runs`) | `POST /stream` - stateless run + SSE; `POST /wait` - stateless run + block; `GET /{rid}/messages` - paginated messages by run_id `{data, has_more}` (cursor: `after_seq`/`before_seq`); `GET /{rid}/feedback` - list feedback by run_id |
 
+**RunManager / RunStore contract**:
+- `RunManager.get()` is async; direct callers must `await` it.
+- When a persistent `RunStore` is configured, `get()` and `list_by_thread()` hydrate historical runs from the store. In-memory records win for the same `run_id` so task, abort, and stream-control state stays attached to active local runs.
+- `cancel()` and `create_or_reject(..., multitask_strategy="interrupt"|"rollback")` persist interrupted status through `RunStore.update_status()`, matching normal `set_status()` transitions.
+- Store-only hydrated runs are readable history. If the current worker has no in-memory task/control state for that run, cancellation APIs can return 409 because this worker cannot stop the task.
+- `POST /wait` (both thread-scoped and `/api/runs/wait`) drains the stream bridge via `wait_for_run_completion()` instead of bare `await record.task`, so it honours the run's `on_disconnect` setting and cancels the background run on real client disconnect rather than returning a stale checkpoint (issue #3265).
+
 Proxied through nginx: `/api/langgraph/*` → Gateway LangGraph-compatible runtime, all other `/api/*` → Gateway REST APIs.
 
 ### Sandbox System (`packages/harness/deerflow/sandbox/`)
 
 **Interface**: Abstract `Sandbox` with `execute_command`, `read_file`, `write_file`, `list_dir`
-**Provider Pattern**: `SandboxProvider` with `acquire`, `get`, `release` lifecycle
+**Provider Pattern**: `SandboxProvider` with `acquire`, `acquire_async`, `get`, `release` lifecycle. Async agent/tool paths call async sandbox lifecycle hooks so Docker sandbox creation, discovery, cross-process locking, readiness polling, and release stay off the event loop.
 **Implementations**:
-- `LocalSandboxProvider` - Singleton local filesystem execution with path mappings
+- `LocalSandboxProvider` - Local filesystem execution. `acquire(thread_id)` returns a per-thread `LocalSandbox` (id `local:{thread_id}`) whose `path_mappings` resolve `/mnt/user-data/{workspace,uploads,outputs}` and `/mnt/acp-workspace` to that thread's host directories, so the public `Sandbox` API honours the `/mnt/user-data` contract uniformly with AIO. `acquire()` / `acquire(None)` keeps the legacy generic singleton (id `local`) for callers without a thread context. Per-thread sandboxes are held in an LRU cache (default 256 entries) guarded by a `threading.Lock`.
 - `AioSandboxProvider` (`packages/harness/deerflow/community/`) - Docker-based isolation
 
 **Virtual Path System**:
 - Agent sees: `/mnt/user-data/{workspace,uploads,outputs}`, `/mnt/skills`
 - Physical: `backend/.deer-flow/users/{user_id}/threads/{thread_id}/user-data/...`, `deer-flow/skills/`
-- Translation: `replace_virtual_path()` / `replace_virtual_paths_in_command()`
+- Translation: `LocalSandboxProvider` builds per-thread `PathMapping`s for the user-data prefixes at acquire time; `tools.py` keeps `replace_virtual_path()` / `replace_virtual_paths_in_command()` as a defense-in-depth layer (and for path validation). AIO has the directories volume-mounted at the same virtual paths inside its container, so both implementations accept `/mnt/user-data/...` natively.
-- Detection: `is_local_sandbox()` checks `sandbox_id == "local"`
+- Detection: `is_local_sandbox()` accepts both `sandbox_id == "local"` (legacy / no-thread) and `sandbox_id.startswith("local:")` (per-thread)
 
 **Sandbox Tools** (in `packages/harness/deerflow/sandbox/tools.py`):
 - `bash` - Execute commands with path translation and error handling
@@ -289,7 +347,7 @@ Proxied through nginx: `/api/langgraph/*` → Gateway LangGraph-compatible runti
 - **Cache invalidation**: Detects config file changes via mtime comparison
 - **Transports**: stdio (command-based), SSE, HTTP
 - **OAuth (HTTP/SSE)**: Supports token endpoint flows (`client_credentials`, `refresh_token`) with automatic token refresh + Authorization header injection
-- **Runtime updates**: Gateway API saves to extensions_config.json; LangGraph detects via mtime
+- **Runtime updates**: Gateway API saves to extensions_config.json; the Gateway-embedded runtime detects changes via mtime
 
 ### Skills System (`packages/harness/deerflow/skills/`)
 
@@ -316,7 +374,7 @@ Proxied through nginx: `/api/langgraph/*` → Gateway LangGraph-compatible runti
 
 ### IM Channels System (`app/channels/`)
 
-Bridges external messaging platforms (Feishu, Slack, Telegram, DingTalk) to the DeerFlow agent via the LangGraph Server.
+Bridges external messaging platforms (Feishu, Slack, Telegram, DingTalk) to the DeerFlow agent via Gateway's LangGraph-compatible API.
 
 
 **Architecture**: Channels communicate with Gateway through the `langgraph-sdk` HTTP client (same as the frontend), ensuring threads are created and managed server-side. The internal SDK client injects process-local internal auth plus a matching CSRF cookie/header pair so Gateway accepts state-changing thread/run requests from channel workers without relying on browser session cookies.
@@ -391,6 +449,24 @@ Focused regression coverage for the updater lives in `backend/tests/test_memory_
 - `resolve_variable(path)` - Import module and return variable (e.g., `module.path:variable_name`)
 - `resolve_class(path, base_class)` - Import and validate class against base class
 
+### Tracing System (`packages/harness/deerflow/tracing/`)
+
+LangSmith and Langfuse are both supported. The wiring lives in two layers:
+
+- `factory.py::build_tracing_callbacks()` — returns the LangChain `CallbackHandler` list for the providers currently enabled via env vars (`LANGSMITH_TRACING`, `LANGFUSE_TRACING`, etc.). The handlers are attached at the **graph invocation root** for in-graph runs (`make_lead_agent` and `DeerFlowClient.stream` both append them to `config["callbacks"]` before invoking the graph) so a single run produces one trace with all node / LLM / tool calls as child spans. Standalone callers — anything that invokes a model outside such a graph (e.g. `MemoryUpdater`) — keep `create_chat_model`'s default `attach_tracing=True`, which falls back to model-level callback attachment.
+- `metadata.py::build_langfuse_trace_metadata()` — builds the Langfuse-reserved trace attributes for `RunnableConfig.metadata`. The Langfuse v4 `langchain.CallbackHandler` lifts these onto the root trace (see its `_parse_langfuse_trace_attributes`), but only when it sees `on_chain_start(parent_run_id=None)` — which is why the callbacks have to live at the graph root, not the model.
+
+**Trace-attribute injection points**: both `runtime/runs/worker.py::run_agent` (gateway path) and `client.py::DeerFlowClient.stream` (embedded path) merge the metadata into `config["metadata"]` right before constructing the graph. Caller-supplied keys win via `setdefault`, so an external `session_id` override is preserved. Field mapping:
+
+| Langfuse field         | Source                                       |
+|-----------------------|----------------------------------------------|
+| `langfuse_session_id` | LangGraph `thread_id`                         |
+| `langfuse_user_id`    | `get_effective_user_id()` (`default` in no-auth) |
+| `langfuse_trace_name` | `RunRecord.assistant_id` / client `agent_name` (defaults to `lead-agent`) |
+| `langfuse_tags`       | `env:<DEER_FLOW_ENV>` + `model:<model_name>`  |
+
+Returns `{}` when Langfuse is not in the enabled providers — LangSmith-only deployments are unaffected. Set `DEER_FLOW_ENV` (or `ENVIRONMENT`) to tag traces by deployment environment. Tests live in `tests/test_tracing_factory.py`, `tests/test_tracing_metadata.py`, `tests/test_worker_langfuse_metadata.py`, and `tests/test_client_langfuse_metadata.py`.
+
 ### Config Schema
 
 **`config.yaml`** key sections:

backend/Makefile

@@ -2,13 +2,16 @@ install:
 	uv sync
 
 dev:
-	PYTHONPATH=. uv run uvicorn app.gateway.app:app --host 0.0.0.0 --port 8001 --reload
+	PYTHONPATH=. PYTHONIOENCODING=utf-8 PYTHONUTF8=1 uv run uvicorn app.gateway.app:app --host 0.0.0.0 --port 8001 --reload
 
 gateway:
-	PYTHONPATH=. uv run uvicorn app.gateway.app:app --host 0.0.0.0 --port 8001
+	PYTHONPATH=. PYTHONIOENCODING=utf-8 PYTHONUTF8=1 uv run uvicorn app.gateway.app:app --host 0.0.0.0 --port 8001
 
 test:
-	PYTHONPATH=. uv run pytest tests/ -v
+	PYTHONPATH=. PYTHONIOENCODING=utf-8 PYTHONUTF8=1 uv run pytest tests/ -v
+
+test-blocking-io:
+	PYTHONPATH=. PYTHONIOENCODING=utf-8 PYTHONUTF8=1 uv run pytest tests/blocking_io -q --tb=short
 
 lint:
 	uvx ruff check .
@@ -16,3 +19,6 @@ lint:
 
 format:
 	uvx ruff check . --fix && uvx ruff format .
+
+detect-blocking-io:
+	@PYTHONPATH=. PYTHONIOENCODING=utf-8 PYTHONUTF8=1 uv run python ../scripts/detect_blocking_io_static.py --output ../.deer-flow/blocking-io-findings.json

backend/README.md

@@ -69,7 +69,7 @@ Middlewares execute in strict order, each handling a specific concern:
 Per-thread isolated execution with virtual path translation:
 
 - **Abstract interface**: `execute_command`, `read_file`, `write_file`, `list_dir`
-- **Providers**: `LocalSandboxProvider` (filesystem) and `AioSandboxProvider` (Docker, in community/)
+- **Providers**: `LocalSandboxProvider` (filesystem) and `AioSandboxProvider` (Docker, in community/). Async runtime paths use async sandbox lifecycle hooks so startup, readiness polling, and release do not block the event loop.
 - **Virtual paths**: `/mnt/user-data/{workspace,uploads,outputs}` → thread-specific physical directories
 - **Skills path**: `/mnt/skills` → `deer-flow/skills/` directory
 - **Skills loading**: Recursively discovers nested `SKILL.md` files under `skills/{public,custom}` and preserves nested container paths
@@ -362,6 +362,7 @@ make dev        # Run Gateway API + embedded agent runtime (port 8001)
 make gateway    # Run Gateway API without reload (port 8001)
 make lint       # Run linter (ruff)
 make format     # Format code (ruff)
+make detect-blocking-io  # Inventory blocking IO that may block the backend event loop
 ```
 
 ### Code Style
@@ -378,6 +379,18 @@ make format     # Format code (ruff)
 uv run pytest
 ```
 
+`make detect-blocking-io` statically scans backend business code for blocking
+IO that may run on the backend event loop and is not test-coverage-bound. It
+prints a concise summary for human review and writes complete JSON findings to
+`.deer-flow/blocking-io-findings.json` at the repository root (regardless of
+whether the target is invoked from the repo root or from `backend/`). JSON
+findings include both broad IO category and review-oriented fields such as
+`priority`, `location`, `blocking_call`, `event_loop_exposure`, `reason`, and
+`code`. `priority` is a deterministic review ordering from the operation type,
+not proof of a bug. Bare-name same-file calls are resolved by function name,
+so duplicate helper names in one file can conservatively over-report async
+reachability.
+
 ---
 
 ## Technology Stack

backend/app/channels/manager.py

@@ -146,13 +146,6 @@ def _normalize_custom_agent_name(raw_value: str) -> str:
     return normalized
 
 
-def _strip_loop_warning_text(text: str) -> str:
-    """Remove middleware-authored loop warning lines from display text."""
-    if "[LOOP DETECTED]" not in text:
-        return text
-    return "\n".join(line for line in text.splitlines() if "[LOOP DETECTED]" not in line).strip()
-
-
 def _extract_response_text(result: dict | list) -> str:
     """Extract the last AI message text from a LangGraph runs.wait result.
 
@@ -162,7 +155,6 @@ def _extract_response_text(result: dict | list) -> str:
     Handles special cases:
     - Regular AI text responses
     - Clarification interrupts (``ask_clarification`` tool messages)
-    - Strips loop-detection warnings attached to tool-call AI messages
     """
     if isinstance(result, list):
         messages = result
@@ -181,6 +173,8 @@ def _extract_response_text(result: dict | list) -> str:
 
         # Stop at the last human message — anything before it is a previous turn
         if msg_type == "human":
+            if _is_hidden_human_control_message(msg):
+                continue
             break
 
         # Check for tool messages from ask_clarification (interrupt case)
@@ -192,12 +186,7 @@ def _extract_response_text(result: dict | list) -> str:
         # Regular AI message with text content
         if msg_type == "ai":
             content = msg.get("content", "")
-            has_tool_calls = bool(msg.get("tool_calls"))
             if isinstance(content, str) and content:
-                if has_tool_calls:
-                    content = _strip_loop_warning_text(content)
-                    if not content:
-                        continue
                 return content
             # content can be a list of content blocks
             if isinstance(content, list):
@@ -208,8 +197,6 @@ def _extract_response_text(result: dict | list) -> str:
                     elif isinstance(block, str):
                         parts.append(block)
                 text = "".join(parts)
-                if has_tool_calls:
-                    text = _strip_loop_warning_text(text)
                 if text:
                     return text
     return ""
@@ -328,6 +315,8 @@ def _extract_artifacts(result: dict | list) -> list[str]:
             continue
         # Stop at the last human message — anything before it is a previous turn
         if msg.get("type") == "human":
+            if _is_hidden_human_control_message(msg):
+                continue
             break
         # Look for AI messages with present_files tool calls
         if msg.get("type") == "ai":
@@ -340,6 +329,18 @@ def _extract_artifacts(result: dict | list) -> list[str]:
     return artifacts
 
 
+def _is_hidden_human_control_message(msg: Mapping[str, Any]) -> bool:
+    """Return whether a human message is an internal control message hidden from UI."""
+    if msg.get("type") != "human":
+        return False
+
+    additional_kwargs = msg.get("additional_kwargs")
+    if not isinstance(additional_kwargs, Mapping):
+        return False
+
+    return additional_kwargs.get("hide_from_ui") is True
+
+
 def _format_artifact_text(artifacts: list[str]) -> str:
     """Format artifact paths into a human-readable text block listing filenames."""
     import posixpath

backend/app/gateway/app.py

@@ -161,10 +161,16 @@ async def _migrate_orphaned_threads(store, admin_user_id: str) -> int:
 async def lifespan(app: FastAPI) -> AsyncGenerator[None, None]:
     """Application lifespan handler."""
 
-    # Load config and check necessary environment variables at startup
+    # Load config and check necessary environment variables at startup.
+    # `startup_config` is a local snapshot used only for one-shot bootstrap
+    # work (logging level, langgraph_runtime engines, channels). Request-time
+    # config resolution always routes through `get_app_config()` in
+    # `app/gateway/deps.py::get_config()` so `config.yaml` edits become
+    # visible without a process restart. We deliberately do NOT cache this
+    # snapshot on `app.state` to keep that contract enforceable.
     try:
-        app.state.config = get_app_config()
+        startup_config = get_app_config()
-        apply_logging_level(app.state.config.log_level)
+        apply_logging_level(startup_config.log_level)
         logger.info("Configuration loaded successfully")
     except Exception as e:
         error_msg = f"Failed to load configuration during gateway startup: {e}"
@@ -174,7 +180,7 @@ async def lifespan(app: FastAPI) -> AsyncGenerator[None, None]:
     logger.info(f"Starting API Gateway on {config.host}:{config.port}")
 
     # Initialize LangGraph runtime components (StreamBridge, RunManager, checkpointer, store)
-    async with langgraph_runtime(app):
+    async with langgraph_runtime(app, startup_config):
         logger.info("LangGraph runtime initialised")
 
         # Check admin bootstrap state and migrate orphan threads after admin exists.
@@ -185,7 +191,7 @@ async def lifespan(app: FastAPI) -> AsyncGenerator[None, None]:
         try:
             from app.channels.service import start_channel_service
 
-            channel_service = await start_channel_service(app.state.config)
+            channel_service = await start_channel_service(startup_config)
             logger.info("Channel service started: %s", channel_service.get_status())
         except Exception:
             logger.exception("No IM channels configured or channel service failed to start")

backend/app/gateway/deps.py

@@ -3,11 +3,21 @@
 **Getters** (used by routers): raise 503 when a required dependency is
 missing, except ``get_store`` which returns ``None``.
 
+``AppConfig`` is intentionally *not* cached on ``app.state``. Routers and the
+run path resolve it through :func:`deerflow.config.app_config.get_app_config`,
+which performs mtime-based hot reload, so edits to ``config.yaml`` take
+effect on the next request without a process restart. The engines created in
+:func:`langgraph_runtime` (stream bridge, persistence, checkpointer, store,
+run-event store) accept a ``startup_config`` snapshot — they are
+restart-required by design and stay bound to that snapshot to keep the live
+process consistent with itself.
+
 Initialization is handled directly in ``app.py`` via :class:`AsyncExitStack`.
 """
 
 from __future__ import annotations
 
+import logging
 from collections.abc import AsyncGenerator, Callable
 from contextlib import AsyncExitStack, asynccontextmanager
 from typing import TYPE_CHECKING, TypeVar, cast
@@ -15,36 +25,97 @@ from typing import TYPE_CHECKING, TypeVar, cast
 from fastapi import FastAPI, HTTPException, Request
 from langgraph.types import Checkpointer
 
-from deerflow.config.app_config import AppConfig
+from deerflow.config.app_config import AppConfig, get_app_config
 from deerflow.persistence.feedback import FeedbackRepository
 from deerflow.runtime import RunContext, RunManager, StreamBridge
 from deerflow.runtime.events.store.base import RunEventStore
 from deerflow.runtime.runs.store.base import RunStore
 
+logger = logging.getLogger(__name__)
+
 if TYPE_CHECKING:
     from app.gateway.auth.local_provider import LocalAuthProvider
     from app.gateway.auth.repositories.sqlite import SQLiteUserRepository
     from deerflow.persistence.thread_meta.base import ThreadMetaStore
+    from deerflow.runtime import RunRecord
 
 
 T = TypeVar("T")
 
 
-def get_config(request: Request) -> AppConfig:
+async def _mark_latest_recovered_threads_error(
-    """Return the app-scoped ``AppConfig`` stored on ``app.state``."""
+    run_manager: RunManager,
-    config = getattr(request.app.state, "config", None)
+    thread_store: ThreadMetaStore,
-    if config is None:
+    recovered_runs: list[RunRecord],
-        raise HTTPException(status_code=503, detail="Configuration not available")
+) -> None:
-    return config
+    """Mark thread status as error only when its newest run was recovered."""
+    recovered_by_thread: dict[str, set[str]] = {}
+    for record in recovered_runs:
+        recovered_by_thread.setdefault(record.thread_id, set()).add(record.run_id)
+
+    for thread_id, recovered_run_ids in recovered_by_thread.items():
+        try:
+            latest_runs = await run_manager.list_by_thread(thread_id, user_id=None, limit=1)
+        except Exception:
+            logger.warning("Failed to find latest run for thread %s during run reconciliation", thread_id, exc_info=True)
+            continue
+        if not latest_runs or latest_runs[0].run_id not in recovered_run_ids:
+            continue
+        try:
+            await thread_store.update_status(thread_id, "error", user_id=None)
+        except Exception:
+            logger.warning("Failed to mark thread %s as error during run reconciliation", thread_id, exc_info=True)
+
+
+def get_config() -> AppConfig:
+    """Return the freshest ``AppConfig`` for the current request.
+
+    Routes through :func:`deerflow.config.app_config.get_app_config`, which
+    honours runtime ``ContextVar`` overrides and reloads ``config.yaml`` from
+    disk when its mtime changes. ``AppConfig`` is not cached on ``app.state``
+    at all — the only startup-time snapshot lives as a local
+    ``startup_config`` variable inside ``lifespan()`` and is passed
+    explicitly into :func:`langgraph_runtime` for the engines that are
+    restart-required by design. Routing every request through
+    :func:`get_app_config` closes the bytedance/deer-flow issue #3107 BUG-001
+    split-brain where the worker / lead-agent thread saw a stale startup
+    snapshot.
+
+    Any failure to materialise the config (missing file, permission denied,
+    YAML parse error, validation error) is reported as 503 — semantically
+    "the gateway cannot serve requests without a usable configuration" — and
+    logged with the original exception so operators have something to debug.
+    """
+    try:
+        return get_app_config()
+    except Exception as exc:  # noqa: BLE001 - request boundary: log and degrade gracefully
+        logger.exception("Failed to load AppConfig at request time")
+        raise HTTPException(status_code=503, detail="Configuration not available") from exc
 
 
 @asynccontextmanager
-async def langgraph_runtime(app: FastAPI) -> AsyncGenerator[None, None]:
+async def langgraph_runtime(app: FastAPI, startup_config: AppConfig) -> AsyncGenerator[None, None]:
     """Bootstrap and tear down all LangGraph runtime singletons.
 
+    ``startup_config`` is the ``AppConfig`` snapshot taken once during
+    ``lifespan()`` for one-shot infrastructure bootstrap. The engines and
+    stores constructed here (stream bridge, persistence engine, checkpointer,
+    store, run-event store) are restart-required by design — they hold live
+    connections, file handles, or singleton providers — so they bind to this
+    snapshot and survive across `config.yaml` edits. Request-time consumers
+    must still go through :func:`get_config` for any field that should be
+    hot-reloadable. See ``backend/CLAUDE.md`` "Config Hot-Reload Boundary".
+
+    The matching ``run_events_config`` is frozen onto ``app.state`` so
+    :func:`get_run_context` pairs a freshly-loaded ``AppConfig`` with the
+    *startup-time* run-events configuration the underlying ``event_store``
+    was built from — otherwise the runtime could end up combining a live
+    new ``run_events_config`` with an event store still bound to the
+    previous backend.
+
     Usage in ``app.py``::
 
-        async with langgraph_runtime(app):
+        async with langgraph_runtime(app, startup_config):
             yield
     """
     from deerflow.persistence.engine import close_engine, get_session_factory, init_engine_from_config
@@ -53,9 +124,7 @@ async def langgraph_runtime(app: FastAPI) -> AsyncGenerator[None, None]:
     from deerflow.runtime.events.store import make_run_event_store
 
     async with AsyncExitStack() as stack:
-        config = getattr(app.state, "config", None)
+        config = startup_config
-        if config is None:
-            raise RuntimeError("langgraph_runtime() requires app.state.config to be initialized")
 
         app.state.stream_bridge = await stack.enter_async_context(make_stream_bridge(config))
 
@@ -84,12 +153,26 @@ async def langgraph_runtime(app: FastAPI) -> AsyncGenerator[None, None]:
 
         app.state.thread_store = make_thread_store(sf, app.state.store)
 
-        # Run event store (has its own factory with config-driven backend selection)
+        # Run event store. The store and the matching ``run_events_config`` are
+        # both frozen at startup so ``get_run_context`` does not combine a
+        # freshly-reloaded ``AppConfig.run_events`` with a store still bound to
+        # the previous backend.
         run_events_config = getattr(config, "run_events", None)
+        app.state.run_events_config = run_events_config
         app.state.run_event_store = make_run_event_store(run_events_config)
 
         # RunManager with store backing for persistence
         app.state.run_manager = RunManager(store=app.state.run_store)
+        if getattr(config.database, "backend", None) == "sqlite":
+            from deerflow.utils.time import now_iso
+
+            # Startup-only recovery: clean shutdowns return no active rows and
+            # the thread-status update below becomes a no-op.
+            recovered_runs = await app.state.run_manager.reconcile_orphaned_inflight_runs(
+                error="Gateway restarted before this run reached a durable final state.",
+                before=now_iso(),
+            )
+            await _mark_latest_recovered_threads_error(app.state.run_manager, app.state.thread_store, recovered_runs)
 
         try:
             yield
@@ -139,16 +222,20 @@ def get_thread_store(request: Request) -> ThreadMetaStore:
 def get_run_context(request: Request) -> RunContext:
     """Build a :class:`RunContext` from ``app.state`` singletons.
 
-    Returns a *base* context with infrastructure dependencies.
+    Returns a *base* context with infrastructure dependencies. The
+    ``app_config`` field is resolved live so per-run fields (e.g.
+    ``models[*].max_tokens``) follow ``config.yaml`` edits; the
+    ``event_store`` / ``run_events_config`` pair stays frozen to the snapshot
+    captured in :func:`langgraph_runtime` so callers never see a store bound
+    to one backend paired with a config pointing at another.
     """
-    config = get_config(request)
     return RunContext(
         checkpointer=get_checkpointer(request),
         store=get_store(request),
         event_store=get_run_event_store(request),
-        run_events_config=getattr(config, "run_events", None),
+        run_events_config=getattr(request.app.state, "run_events_config", None),
         thread_store=get_thread_store(request),
-        app_config=config,
+        app_config=get_config(),
     )
 
 

backend/app/gateway/internal_auth.py

@@ -1,23 +1,34 @@
-"""Process-local authentication for Gateway internal callers."""
+"""Authentication for trusted Gateway internal callers."""
 
 from __future__ import annotations
 
+import os
 import secrets
 from types import SimpleNamespace
 
 from deerflow.runtime.user_context import DEFAULT_USER_ID
 
 INTERNAL_AUTH_HEADER_NAME = "X-DeerFlow-Internal-Token"
-_INTERNAL_AUTH_TOKEN = secrets.token_urlsafe(32)
+INTERNAL_AUTH_ENV_VAR = "DEER_FLOW_INTERNAL_AUTH_TOKEN"
+
+
+def _load_internal_auth_token() -> str:
+    token = os.environ.get(INTERNAL_AUTH_ENV_VAR)
+    if token:
+        return token
+    return secrets.token_urlsafe(32)
+
+
+_INTERNAL_AUTH_TOKEN = _load_internal_auth_token()
 
 
 def create_internal_auth_headers() -> dict[str, str]:
-    """Return headers that authenticate same-process Gateway internal calls."""
+    """Return headers that authenticate trusted Gateway internal calls."""
     return {INTERNAL_AUTH_HEADER_NAME: _INTERNAL_AUTH_TOKEN}
 
 
 def is_valid_internal_auth_token(token: str | None) -> bool:
-    """Return True when *token* matches the process-local internal token."""
+    """Return True when *token* matches this Gateway worker's internal token."""
     return bool(token) and secrets.compare_digest(token, _INTERNAL_AUTH_TOKEN)
 
 

backend/app/gateway/routers/auth.py

@@ -1,5 +1,6 @@
 """Authentication endpoints."""
 
+import asyncio
 import logging
 import os
 import time
@@ -382,9 +383,15 @@ async def get_me(request: Request):
     return UserResponse(id=str(user.id), email=user.email, system_role=user.system_role, needs_setup=user.needs_setup)
 
 
-_SETUP_STATUS_COOLDOWN: dict[str, float] = {}
+# Per-IP cache: ip → (timestamp, result_dict).
-_SETUP_STATUS_COOLDOWN_SECONDS = 60
+# Returns the cached result within the TTL instead of 429, because
+# the answer (whether an admin exists) rarely changes and returning
+# 429 breaks multi-tab / post-restart reconnection storms.
+_SETUP_STATUS_CACHE: dict[str, tuple[float, dict]] = {}
+_SETUP_STATUS_CACHE_TTL_SECONDS = 60
 _MAX_TRACKED_SETUP_STATUS_IPS = 10000
+_SETUP_STATUS_INFLIGHT: dict[str, asyncio.Task[dict]] = {}
+_SETUP_STATUS_INFLIGHT_GUARD = asyncio.Lock()
 
 
 @router.get("/setup-status")
@@ -392,29 +399,56 @@ async def setup_status(request: Request):
     """Check if an admin account exists. Returns needs_setup=True when no admin exists."""
     client_ip = _get_client_ip(request)
     now = time.time()
-    last_check = _SETUP_STATUS_COOLDOWN.get(client_ip, 0)
+
-    elapsed = now - last_check
+    # Return cached result when within TTL — avoids 429 on multi-tab reconnection.
-    if elapsed < _SETUP_STATUS_COOLDOWN_SECONDS:
+    cached = _SETUP_STATUS_CACHE.get(client_ip)
-        retry_after = max(1, int(_SETUP_STATUS_COOLDOWN_SECONDS - elapsed))
+    if cached is not None:
-        raise HTTPException(
+        cached_time, cached_result = cached
-            status_code=status.HTTP_429_TOO_MANY_REQUESTS,
+        if now - cached_time < _SETUP_STATUS_CACHE_TTL_SECONDS:
-            detail="Setup status check is rate limited",
+            return cached_result
-            headers={"Retry-After": str(retry_after)},
+
-        )
+    async with _SETUP_STATUS_INFLIGHT_GUARD:
-    # Evict stale entries when dict grows too large to bound memory usage.
+        # Recheck cache after waiting for the inflight guard.
-    if len(_SETUP_STATUS_COOLDOWN) >= _MAX_TRACKED_SETUP_STATUS_IPS:
+        now = time.time()
-        cutoff = now - _SETUP_STATUS_COOLDOWN_SECONDS
+        cached = _SETUP_STATUS_CACHE.get(client_ip)
-        stale = [k for k, t in _SETUP_STATUS_COOLDOWN.items() if t < cutoff]
+        if cached is not None:
-        for k in stale:
+            cached_time, cached_result = cached
-            del _SETUP_STATUS_COOLDOWN[k]
+            if now - cached_time < _SETUP_STATUS_CACHE_TTL_SECONDS:
-        # If still too large after evicting expired entries, remove oldest half.
+                return cached_result
-        if len(_SETUP_STATUS_COOLDOWN) >= _MAX_TRACKED_SETUP_STATUS_IPS:
+
-            by_time = sorted(_SETUP_STATUS_COOLDOWN.items(), key=lambda kv: kv[1])
+        task = _SETUP_STATUS_INFLIGHT.get(client_ip)
-            for k, _ in by_time[: len(by_time) // 2]:
+        if task is None:
-                del _SETUP_STATUS_COOLDOWN[k]
+            # Evict stale entries when dict grows too large to bound memory usage.
-    _SETUP_STATUS_COOLDOWN[client_ip] = now
+            if len(_SETUP_STATUS_CACHE) >= _MAX_TRACKED_SETUP_STATUS_IPS:
-    admin_count = await get_local_provider().count_admin_users()
+                cutoff = now - _SETUP_STATUS_CACHE_TTL_SECONDS
-    return {"needs_setup": admin_count == 0}
+                stale = [k for k, (t, _) in _SETUP_STATUS_CACHE.items() if t < cutoff]
+                for k in stale:
+                    del _SETUP_STATUS_CACHE[k]
+                if len(_SETUP_STATUS_CACHE) >= _MAX_TRACKED_SETUP_STATUS_IPS:
+                    by_time = sorted(_SETUP_STATUS_CACHE.items(), key=lambda entry: entry[1][0])
+                    for k, _ in by_time[: len(by_time) // 2]:
+                        del _SETUP_STATUS_CACHE[k]
+
+            async def _compute_setup_status() -> dict:
+                admin_count = await get_local_provider().count_admin_users()
+                return {"needs_setup": admin_count == 0}
+
+            task = asyncio.create_task(_compute_setup_status())
+            _SETUP_STATUS_INFLIGHT[client_ip] = task
+
+    try:
+        result = await task
+    finally:
+        async with _SETUP_STATUS_INFLIGHT_GUARD:
+            if _SETUP_STATUS_INFLIGHT.get(client_ip) is task:
+                del _SETUP_STATUS_INFLIGHT[client_ip]
+
+    # Cache only the stable "initialized" result to avoid stale setup redirects.
+    if result["needs_setup"] is False:
+        _SETUP_STATUS_CACHE[client_ip] = (time.time(), result)
+    else:
+        _SETUP_STATUS_CACHE.pop(client_ip, None)
+    return result
 
 
 class InitializeAdminRequest(BaseModel):

backend/app/gateway/routers/mcp.py

@@ -63,6 +63,99 @@ class McpConfigUpdateRequest(BaseModel):
     )
 
 
+_MASKED_VALUE = "***"
+
+
+def _mask_server_config(server: McpServerConfigResponse) -> McpServerConfigResponse:
+    """Return a copy of server config with sensitive fields masked.
+
+    Masks env values, header values, and removes OAuth secrets so they
+    are not exposed through the GET API endpoint.
+    """
+    masked_env = {k: _MASKED_VALUE for k in server.env}
+    masked_headers = {k: _MASKED_VALUE for k in server.headers}
+    masked_oauth = None
+    if server.oauth is not None:
+        masked_oauth = server.oauth.model_copy(
+            update={
+                "client_secret": None,
+                "refresh_token": None,
+            }
+        )
+    return server.model_copy(
+        update={
+            "env": masked_env,
+            "headers": masked_headers,
+            "oauth": masked_oauth,
+        }
+    )
+
+
+def _merge_preserving_secrets(
+    incoming: McpServerConfigResponse,
+    existing: McpServerConfigResponse,
+) -> McpServerConfigResponse:
+    """Merge incoming config with existing, preserving secrets masked by GET.
+
+    When the frontend toggles ``enabled`` it round-trips the full config:
+    GET (masked) → modify enabled → PUT (masked values sent back).
+    This function ensures masked values (``***``) are replaced with the
+    real secrets from the current on-disk config.
+
+    ``***`` is only accepted for keys that already exist in *existing*.
+    New keys must provide a real value.
+
+    For OAuth secrets, ``None`` means "preserve the existing stored value"
+    so masked GET responses can be safely round-tripped. To explicitly clear
+    a stored secret, clients may send an empty string, which is converted
+    to ``None`` before persisting.
+    """
+    merged_env = {}
+    for k, v in incoming.env.items():
+        if v == _MASKED_VALUE:
+            if k in existing.env:
+                merged_env[k] = existing.env[k]
+            else:
+                raise HTTPException(
+                    status_code=400,
+                    detail=f"Cannot set env key '{k}' to masked value '***'; provide a real value.",
+                )
+        else:
+            merged_env[k] = v
+
+    merged_headers = {}
+    for k, v in incoming.headers.items():
+        if v == _MASKED_VALUE:
+            if k in existing.headers:
+                merged_headers[k] = existing.headers[k]
+            else:
+                raise HTTPException(
+                    status_code=400,
+                    detail=f"Cannot set header '{k}' to masked value '***'; provide a real value.",
+                )
+        else:
+            merged_headers[k] = v
+
+    merged_oauth = incoming.oauth
+    if incoming.oauth is not None and existing.oauth is not None:
+        # None = preserve (masked round-trip), "" = explicitly clear, else = new value
+        merged_client_secret = existing.oauth.client_secret if incoming.oauth.client_secret is None else (None if incoming.oauth.client_secret == "" else incoming.oauth.client_secret)
+        merged_refresh_token = existing.oauth.refresh_token if incoming.oauth.refresh_token is None else (None if incoming.oauth.refresh_token == "" else incoming.oauth.refresh_token)
+        merged_oauth = incoming.oauth.model_copy(
+            update={
+                "client_secret": merged_client_secret,
+                "refresh_token": merged_refresh_token,
+            }
+        )
+    return incoming.model_copy(
+        update={
+            "env": merged_env,
+            "headers": merged_headers,
+            "oauth": merged_oauth,
+        }
+    )
+
+
 @router.get(
     "/mcp/config",
     response_model=McpConfigResponse,
@@ -83,7 +176,7 @@ async def get_mcp_configuration() -> McpConfigResponse:
                     "enabled": true,
                     "command": "npx",
                     "args": ["-y", "@modelcontextprotocol/server-github"],
-                    "env": {"GITHUB_TOKEN": "ghp_xxx"},
+                    "env": {"GITHUB_TOKEN": "***"},
                     "description": "GitHub MCP server for repository operations"
                 }
             }
@@ -92,7 +185,8 @@ async def get_mcp_configuration() -> McpConfigResponse:
     """
     config = get_extensions_config()
 
-    return McpConfigResponse(mcp_servers={name: McpServerConfigResponse(**server.model_dump()) for name, server in config.mcp_servers.items()})
+    servers = {name: _mask_server_config(McpServerConfigResponse(**server.model_dump())) for name, server in config.mcp_servers.items()}
+    return McpConfigResponse(mcp_servers=servers)
 
 
 @router.put(
@@ -142,14 +236,39 @@ async def update_mcp_configuration(request: McpConfigUpdateRequest) -> McpConfig
             config_path = Path.cwd().parent / "extensions_config.json"
             logger.info(f"No existing extensions config found. Creating new config at: {config_path}")
 
-        # Load current config to preserve skills configuration
+        # Load current config to preserve skills
         current_config = get_extensions_config()
 
-        # Convert request to dict format for JSON serialization
+        # Load raw (un-resolved) JSON from disk to use as the merge source.
-        config_data = {
+        # This preserves $VAR placeholders in env values and top-level keys
-            "mcpServers": {name: server.model_dump() for name, server in request.mcp_servers.items()},
+        # like mcpInterceptors that would otherwise be lost.
-            "skills": {name: {"enabled": skill.enabled} for name, skill in current_config.skills.items()},
+        raw_servers: dict[str, dict] = {}
-        }
+        raw_other_keys: dict = {}
+        if config_path is not None and config_path.exists():
+            with open(config_path, encoding="utf-8") as f:
+                raw_data = json.load(f)
+            raw_servers = raw_data.get("mcpServers", {})
+            # Preserve any top-level keys beyond mcpServers/skills
+            for key, value in raw_data.items():
+                if key not in ("mcpServers", "skills"):
+                    raw_other_keys[key] = value
+
+        # Merge incoming server configs with raw on-disk secrets
+        merged_servers: dict[str, McpServerConfigResponse] = {}
+        for name, incoming in request.mcp_servers.items():
+            raw_server = raw_servers.get(name)
+            if raw_server is not None:
+                merged_servers[name] = _merge_preserving_secrets(
+                    incoming,
+                    McpServerConfigResponse(**raw_server),
+                )
+            else:
+                merged_servers[name] = incoming
+
+        # Build config data preserving all top-level keys from the original file
+        config_data = dict(raw_other_keys)
+        config_data["mcpServers"] = {name: server.model_dump() for name, server in merged_servers.items()}
+        config_data["skills"] = {name: {"enabled": skill.enabled} for name, skill in current_config.skills.items()}
 
         # Write the configuration to file
         with open(config_path, "w", encoding="utf-8") as f:
@@ -157,12 +276,12 @@ async def update_mcp_configuration(request: McpConfigUpdateRequest) -> McpConfig
 
         logger.info(f"MCP configuration updated and saved to: {config_path}")
 
-        # NOTE: No need to reload/reset cache here - LangGraph Server (separate process)
+        # Reload the Gateway configuration and update the global cache. The
-        # will detect config file changes via mtime and reinitialize MCP tools automatically
+        # agent runtime lives in Gateway, so this keeps API reads and tool
-
+        # execution aligned after extensions_config.json changes.
-        # Reload the configuration and update the global cache
         reloaded_config = reload_extensions_config()
-        return McpConfigResponse(mcp_servers={name: McpServerConfigResponse(**server.model_dump()) for name, server in reloaded_config.mcp_servers.items()})
+        servers = {name: _mask_server_config(McpServerConfigResponse(**server.model_dump())) for name, server in reloaded_config.mcp_servers.items()}
+        return McpConfigResponse(mcp_servers=servers)
 
     except Exception as e:
         logger.error(f"Failed to update MCP configuration: {e}", exc_info=True)

backend/app/gateway/routers/runs.py

@@ -7,7 +7,6 @@ is reused so that conversation history is preserved across calls.
 
 from __future__ import annotations
 
-import asyncio
 import logging
 import uuid
 
@@ -17,7 +16,7 @@ from fastapi.responses import StreamingResponse
 from app.gateway.authz import require_permission
 from app.gateway.deps import get_checkpointer, get_feedback_repo, get_run_event_store, get_run_manager, get_run_store, get_stream_bridge
 from app.gateway.routers.thread_runs import RunCreateRequest
-from app.gateway.services import sse_consumer, start_run
+from app.gateway.services import sse_consumer, start_run, wait_for_run_completion
 from deerflow.runtime import serialize_channel_values
 
 logger = logging.getLogger(__name__)
@@ -66,24 +65,25 @@ async def stateless_wait(body: RunCreateRequest, request: Request) -> dict:
     Otherwise a new temporary thread is created.
     """
     thread_id = _resolve_thread_id(body)
+    bridge = get_stream_bridge(request)
+    run_mgr = get_run_manager(request)
     record = await start_run(body, thread_id, request)
 
+    completed = True
     if record.task is not None:
-        try:
+        completed = await wait_for_run_completion(bridge, record, request, run_mgr)
-            await record.task
-        except asyncio.CancelledError:
-            pass
 
-    checkpointer = get_checkpointer(request)
+    if completed:
-    config = {"configurable": {"thread_id": thread_id}}
+        checkpointer = get_checkpointer(request)
-    try:
+        config = {"configurable": {"thread_id": thread_id}}
-        checkpoint_tuple = await checkpointer.aget_tuple(config)
+        try:
-        if checkpoint_tuple is not None:
+            checkpoint_tuple = await checkpointer.aget_tuple(config)
-            checkpoint = getattr(checkpoint_tuple, "checkpoint", {}) or {}
+            if checkpoint_tuple is not None:
-            channel_values = checkpoint.get("channel_values", {})
+                checkpoint = getattr(checkpoint_tuple, "checkpoint", {}) or {}
-            return serialize_channel_values(channel_values)
+                channel_values = checkpoint.get("channel_values", {})
-    except Exception:
+                return serialize_channel_values(channel_values)
-        logger.exception("Failed to fetch final state for run %s", record.run_id)
+        except Exception:
+            logger.exception("Failed to fetch final state for run %s", record.run_id)
 
     return {"status": record.status.value, "error": record.error}
 

backend/app/gateway/routers/thread_runs.py

@@ -21,8 +21,8 @@ from pydantic import BaseModel, Field
 
 from app.gateway.authz import require_permission
 from app.gateway.deps import get_checkpointer, get_current_user, get_feedback_repo, get_run_event_store, get_run_manager, get_run_store, get_stream_bridge
-from app.gateway.services import sse_consumer, start_run
+from app.gateway.services import sse_consumer, start_run, wait_for_run_completion
-from deerflow.runtime import RunRecord, serialize_channel_values
+from deerflow.runtime import RunRecord, RunStatus, serialize_channel_values
 
 logger = logging.getLogger(__name__)
 router = APIRouter(prefix="/api/threads", tags=["runs"])
@@ -66,6 +66,14 @@ class RunResponse(BaseModel):
     multitask_strategy: str = "reject"
     created_at: str = ""
     updated_at: str = ""
+    total_input_tokens: int = 0
+    total_output_tokens: int = 0
+    total_tokens: int = 0
+    llm_call_count: int = 0
+    lead_agent_tokens: int = 0
+    subagent_tokens: int = 0
+    middleware_tokens: int = 0
+    message_count: int = 0
 
 
 class ThreadTokenUsageModelBreakdown(BaseModel):
@@ -94,6 +102,12 @@ class ThreadTokenUsageResponse(BaseModel):
 # ---------------------------------------------------------------------------
 
 
+def _cancel_conflict_detail(run_id: str, record: RunRecord) -> str:
+    if record.status in (RunStatus.pending, RunStatus.running):
+        return f"Run {run_id} is not active on this worker and cannot be cancelled"
+    return f"Run {run_id} is not cancellable (status: {record.status.value})"
+
+
 def _record_to_response(record: RunRecord) -> RunResponse:
     return RunResponse(
         run_id=record.run_id,
@@ -105,6 +119,14 @@ def _record_to_response(record: RunRecord) -> RunResponse:
         multitask_strategy=record.multitask_strategy,
         created_at=record.created_at,
         updated_at=record.updated_at,
+        total_input_tokens=record.total_input_tokens,
+        total_output_tokens=record.total_output_tokens,
+        total_tokens=record.total_tokens,
+        llm_call_count=record.llm_call_count,
+        lead_agent_tokens=record.lead_agent_tokens,
+        subagent_tokens=record.subagent_tokens,
+        middleware_tokens=record.middleware_tokens,
+        message_count=record.message_count,
     )
 
 
@@ -153,24 +175,25 @@ async def stream_run(thread_id: str, body: RunCreateRequest, request: Request) -
 @require_permission("runs", "create", owner_check=True, require_existing=True)
 async def wait_run(thread_id: str, body: RunCreateRequest, request: Request) -> dict:
     """Create a run and block until it completes, returning the final state."""
+    bridge = get_stream_bridge(request)
+    run_mgr = get_run_manager(request)
     record = await start_run(body, thread_id, request)
 
+    completed = True
     if record.task is not None:
-        try:
+        completed = await wait_for_run_completion(bridge, record, request, run_mgr)
-            await record.task
-        except asyncio.CancelledError:
-            pass
 
-    checkpointer = get_checkpointer(request)
+    if completed:
-    config = {"configurable": {"thread_id": thread_id}}
+        checkpointer = get_checkpointer(request)
-    try:
+        config = {"configurable": {"thread_id": thread_id}}
-        checkpoint_tuple = await checkpointer.aget_tuple(config)
+        try:
-        if checkpoint_tuple is not None:
+            checkpoint_tuple = await checkpointer.aget_tuple(config)
-            checkpoint = getattr(checkpoint_tuple, "checkpoint", {}) or {}
+            if checkpoint_tuple is not None:
-            channel_values = checkpoint.get("channel_values", {})
+                checkpoint = getattr(checkpoint_tuple, "checkpoint", {}) or {}
-            return serialize_channel_values(channel_values)
+                channel_values = checkpoint.get("channel_values", {})
-    except Exception:
+                return serialize_channel_values(channel_values)
-        logger.exception("Failed to fetch final state for run %s", record.run_id)
+        except Exception:
+            logger.exception("Failed to fetch final state for run %s", record.run_id)
 
     return {"status": record.status.value, "error": record.error}
 
@@ -180,7 +203,8 @@ async def wait_run(thread_id: str, body: RunCreateRequest, request: Request) ->
 async def list_runs(thread_id: str, request: Request) -> list[RunResponse]:
     """List all runs for a thread."""
     run_mgr = get_run_manager(request)
-    records = await run_mgr.list_by_thread(thread_id)
+    user_id = await get_current_user(request)
+    records = await run_mgr.list_by_thread(thread_id, user_id=user_id)
     return [_record_to_response(r) for r in records]
 
 
@@ -189,7 +213,8 @@ async def list_runs(thread_id: str, request: Request) -> list[RunResponse]:
 async def get_run(thread_id: str, run_id: str, request: Request) -> RunResponse:
     """Get details of a specific run."""
     run_mgr = get_run_manager(request)
-    record = run_mgr.get(run_id)
+    user_id = await get_current_user(request)
+    record = await run_mgr.get(run_id, user_id=user_id)
     if record is None or record.thread_id != thread_id:
         raise HTTPException(status_code=404, detail=f"Run {run_id} not found")
     return _record_to_response(record)
@@ -212,16 +237,13 @@ async def cancel_run(
     - wait=false: Return immediately with 202
     """
     run_mgr = get_run_manager(request)
-    record = run_mgr.get(run_id)
+    record = await run_mgr.get(run_id)
     if record is None or record.thread_id != thread_id:
         raise HTTPException(status_code=404, detail=f"Run {run_id} not found")
 
     cancelled = await run_mgr.cancel(run_id, action=action)
     if not cancelled:
-        raise HTTPException(
+        raise HTTPException(status_code=409, detail=_cancel_conflict_detail(run_id, record))
-            status_code=409,
-            detail=f"Run {run_id} is not cancellable (status: {record.status.value})",
-        )
 
     if wait and record.task is not None:
         try:
@@ -237,12 +259,14 @@ async def cancel_run(
 @require_permission("runs", "read", owner_check=True)
 async def join_run(thread_id: str, run_id: str, request: Request) -> StreamingResponse:
     """Join an existing run's SSE stream."""
-    bridge = get_stream_bridge(request)
     run_mgr = get_run_manager(request)
-    record = run_mgr.get(run_id)
+    record = await run_mgr.get(run_id)
     if record is None or record.thread_id != thread_id:
         raise HTTPException(status_code=404, detail=f"Run {run_id} not found")
+    if record.store_only:
+        raise HTTPException(status_code=409, detail=f"Run {run_id} is not active on this worker and cannot be streamed")
 
+    bridge = get_stream_bridge(request)
     return StreamingResponse(
         sse_consumer(bridge, record, request, run_mgr),
         media_type="text/event-stream",
@@ -254,7 +278,12 @@ async def join_run(thread_id: str, run_id: str, request: Request) -> StreamingRe
     )
 
 
-@router.api_route("/{thread_id}/runs/{run_id}/stream", methods=["GET", "POST"], response_model=None)
+# Register GET and POST as separate routes so each method gets a unique OpenAPI
+# operationId. ``api_route(methods=["GET", "POST"])`` shares one route registration
+# across both methods, which makes FastAPI emit the same ``operationId`` twice and
+# warn about a duplicate operation id during OpenAPI generation.
+@router.get("/{thread_id}/runs/{run_id}/stream", response_model=None)
+@router.post("/{thread_id}/runs/{run_id}/stream", response_model=None)
 @require_permission("runs", "read", owner_check=True)
 async def stream_existing_run(
     thread_id: str,
@@ -271,14 +300,18 @@ async def stream_existing_run(
     remaining buffered events so the client observes a clean shutdown.
     """
     run_mgr = get_run_manager(request)
-    record = run_mgr.get(run_id)
+    record = await run_mgr.get(run_id)
     if record is None or record.thread_id != thread_id:
         raise HTTPException(status_code=404, detail=f"Run {run_id} not found")
+    if record.store_only and action is None:
+        raise HTTPException(status_code=409, detail=f"Run {run_id} is not active on this worker and cannot be streamed")
 
     # Cancel if an action was requested (stop-button / interrupt flow)
     if action is not None:
         cancelled = await run_mgr.cancel(run_id, action=action)
-        if cancelled and wait and record.task is not None:
+        if not cancelled:
+            raise HTTPException(status_code=409, detail=_cancel_conflict_detail(run_id, record))
+        if wait and record.task is not None:
             try:
                 await record.task
             except (asyncio.CancelledError, Exception):
@@ -391,8 +424,15 @@ async def list_run_events(
 
 @router.get("/{thread_id}/token-usage", response_model=ThreadTokenUsageResponse)
 @require_permission("threads", "read", owner_check=True)
-async def thread_token_usage(thread_id: str, request: Request) -> ThreadTokenUsageResponse:
+async def thread_token_usage(
+    thread_id: str,
+    request: Request,
+    include_active: bool = Query(default=False, description="Include running run progress snapshots"),
+) -> ThreadTokenUsageResponse:
     """Thread-level token usage aggregation."""
     run_store = get_run_store(request)
-    agg = await run_store.aggregate_tokens_by_thread(thread_id)
+    if include_active:
+        agg = await run_store.aggregate_tokens_by_thread(thread_id, include_active=True)
+    else:
+        agg = await run_store.aggregate_tokens_by_thread(thread_id)
     return ThreadTokenUsageResponse(thread_id=thread_id, **agg)

backend/app/gateway/routers/uploads.py

@@ -69,11 +69,30 @@ def _make_file_sandbox_writable(file_path: os.PathLike[str] | str) -> None:
         logger.warning("Skipping sandbox chmod for symlinked upload path: %s", file_path)
         return
 
-    writable_mode = stat.S_IMODE(file_stat.st_mode) | stat.S_IWUSR | stat.S_IWGRP | stat.S_IWOTH
+    writable_mode = stat.S_IMODE(file_stat.st_mode) | stat.S_IWUSR | stat.S_IWGRP | stat.S_IWOTH | stat.S_IRGRP | stat.S_IROTH
     chmod_kwargs = {"follow_symlinks": False} if os.chmod in os.supports_follow_symlinks else {}
     os.chmod(file_path, writable_mode, **chmod_kwargs)
 
 
+def _make_file_sandbox_readable(file_path: os.PathLike[str] | str) -> None:
+    """Ensure uploaded files are readable by the sandbox process.
+
+    For Docker sandboxes (AIO), the gateway writes files as root with 0o600
+    permissions, then bind-mounts the host directory into the container. The
+    sandbox process inside the container runs as a non-root user and cannot
+    read those files without group/other read bits. This function adds
+    ``S_IRGRP | S_IROTH`` so the sandbox can read the uploaded content.
+    """
+    file_stat = os.lstat(file_path)
+    if stat.S_ISLNK(file_stat.st_mode):
+        logger.warning("Skipping sandbox chmod for symlinked upload path: %s", file_path)
+        return
+
+    readable_mode = stat.S_IMODE(file_stat.st_mode) | stat.S_IRGRP | stat.S_IROTH
+    chmod_kwargs = {"follow_symlinks": False} if os.chmod in os.supports_follow_symlinks else {}
+    os.chmod(file_path, readable_mode, **chmod_kwargs)
+
+
 def _uses_thread_data_mounts(sandbox_provider: SandboxProvider) -> bool:
     return bool(getattr(sandbox_provider, "uses_thread_data_mounts", False))
 
@@ -276,6 +295,16 @@ async def upload_files(
             _cleanup_uploaded_paths(written_paths)
             raise HTTPException(status_code=500, detail=f"Failed to upload {file.filename}: {str(e)}")
 
+    # Uploaded files are created with 0o600 permissions (owner read/write only).
+    # In Docker sandbox deployments the gateway writes as root but the sandbox
+    # process runs as a non-root user (typically UID 1000).  Without group/other
+    # read bits the sandbox cannot access the files — whether the uploads
+    # directory is bind-mounted into the container or synced via
+    # sandbox.update_file.  Always add group/other read bits so every sandbox
+    # configuration can read the uploaded content.
+    for file_path in written_paths:
+        _make_file_sandbox_readable(file_path)
+
     if sync_to_sandbox:
         for file_path, virtual_path in sandbox_sync_targets:
             _make_file_sandbox_writable(file_path)

backend/app/gateway/services.py

@@ -15,7 +15,8 @@ from collections.abc import Mapping
 from typing import Any
 
 from fastapi import HTTPException, Request
-from langchain_core.messages import HumanMessage
+from langchain_core.messages import BaseMessage
+from langchain_core.messages.utils import convert_to_messages
 
 from app.gateway.deps import get_run_context, get_run_manager, get_stream_bridge
 from app.gateway.utils import sanitize_log_param
@@ -32,6 +33,7 @@ from deerflow.runtime import (
     UnsupportedStrategyError,
     run_agent,
 )
+from deerflow.runtime.runs.naming import resolve_root_run_name
 
 logger = logging.getLogger(__name__)
 
@@ -75,21 +77,35 @@ def normalize_stream_modes(raw: list[str] | str | None) -> list[str]:
 
 
 def normalize_input(raw_input: dict[str, Any] | None) -> dict[str, Any]:
-    """Convert LangGraph Platform input format to LangChain state dict."""
+    """Convert LangGraph Platform input format to LangChain state dict.
+
+    Delegates dict→message coercion to ``langchain_core.messages.utils.convert_to_messages``
+    so that ``additional_kwargs`` (e.g. uploaded-file metadata — gh #3132), ``id``,
+    ``name``, and non-human roles (ai/system/tool) survive unchanged.  An earlier
+    hand-rolled version only forwarded ``content`` and collapsed every role to
+    ``HumanMessage``, which silently stripped frontend-supplied attachments.
+
+    Malformed message dicts (missing ``role``/``type``/``content``, unsupported
+    role, etc.) raise ``HTTPException(400)`` with the offending index, instead
+    of bubbling up as a 500.  The gateway is a system boundary, so per-entry
+    validation errors are the right shape for clients to retry against.
+    """
     if raw_input is None:
         return {}
     messages = raw_input.get("messages")
     if messages and isinstance(messages, list):
-        converted = []
+        converted: list[Any] = []
-        for msg in messages:
+        for index, msg in enumerate(messages):
-            if isinstance(msg, dict):
+            if isinstance(msg, BaseMessage):
-                role = msg.get("role", msg.get("type", "user"))
+                converted.append(msg)
-                content = msg.get("content", "")
+            elif isinstance(msg, dict):
-                if role in ("user", "human"):
+                try:
-                    converted.append(HumanMessage(content=content))
+                    converted.extend(convert_to_messages([msg]))
-                else:
+                except (ValueError, TypeError, NotImplementedError) as exc:
-                    # TODO: handle other message types (system, ai, tool)
+                    raise HTTPException(
-                    converted.append(HumanMessage(content=content))
+                        status_code=400,
+                        detail=f"Invalid message at input.messages[{index}]: {exc}",
+                    ) from exc
             else:
                 converted.append(msg)
         return {**raw_input, "messages": converted}
@@ -235,6 +251,7 @@ def build_run_config(
             target = config.setdefault("configurable", {})
         if target is not None and "agent_name" not in target:
             target["agent_name"] = normalized
+        config.setdefault("run_name", resolve_root_run_name(config, normalized))
     if metadata:
         config.setdefault("metadata", {}).update(metadata)
     return config
@@ -385,3 +402,51 @@ async def sse_consumer(
         if record.status in (RunStatus.pending, RunStatus.running):
             if record.on_disconnect == DisconnectMode.cancel:
                 await run_mgr.cancel(record.run_id)
+
+
+async def wait_for_run_completion(
+    bridge: StreamBridge,
+    record: RunRecord,
+    request: Request,
+    run_mgr: RunManager,
+) -> bool:
+    """Block until the run publishes ``END_SENTINEL``, honouring on_disconnect.
+
+    The non-streaming ``/wait`` endpoints used to ``await record.task``
+    directly with no disconnect handling.  When the client (or an
+    intermediate HTTP proxy) timed out during a long tool call such as
+    ``pip install``, the handler would swallow ``CancelledError`` and
+    serialize whatever checkpoint happened to exist — masking a half-finished
+    run as a normal completion (issue #3265).
+
+    This helper consumes the same bridge that ``sse_consumer`` does so the
+    wait path shares its disconnect semantics: each wake-up polls
+    ``request.is_disconnected()``; on a real disconnect it cancels the
+    background run when ``record.on_disconnect`` is ``cancel``.  The bridge's
+    heartbeat sentinels guarantee at least one wake-up per
+    ``heartbeat_interval`` even when the agent emits no events for a while.
+
+    Returns:
+        ``True`` when ``END_SENTINEL`` was observed (run reached a terminal
+        state), ``False`` when the loop exited because the client
+        disconnected.  Callers must skip checkpoint serialization on
+        ``False`` so a partial checkpoint is not returned as a normal
+        response.
+    """
+    completed = False
+    try:
+        async for entry in bridge.subscribe(record.run_id):
+            # END_SENTINEL means the run reached a terminal state; honour it
+            # even if the client just disconnected so the caller still serializes
+            # the real final checkpoint.
+            if entry is END_SENTINEL:
+                completed = True
+                return True
+            if await request.is_disconnected():
+                break
+            # Heartbeats and regular events: keep waiting for END_SENTINEL.
+        return completed
+    finally:
+        if not completed and record.status in (RunStatus.pending, RunStatus.running):
+            if record.on_disconnect == DisconnectMode.cancel:
+                await run_mgr.cancel(record.run_id)

backend/docs/API.md

@@ -241,13 +241,6 @@ GET /api/mcp/config
         "GITHUB_TOKEN": "***"
       },
       "description": "GitHub operations"
-    },
-    "filesystem": {
-      "enabled": false,
-      "type": "stdio",
-      "command": "npx",
-      "args": ["-y", "@modelcontextprotocol/server-filesystem"],
-      "description": "File system access"
     }
   }
 }

backend/docs/AUTH_TEST_PLAN.md

@@ -4,10 +4,12 @@
 
 | 模式 | 启动命令 | Auth 层 | 端口 |
 |------|---------|---------|------|
-| 标准模式 | `make dev` | Gateway AuthMiddleware + LangGraph auth | 2026 (nginx) |
+| 标准模式 | `make dev` | Gateway AuthMiddleware（全量） | 2026 (nginx) |
-| Gateway 模式 | `make dev-pro` | Gateway AuthMiddleware（全量） | 2026 (nginx) |
 | 直连 Gateway | `cd backend && make gateway` | Gateway AuthMiddleware | 8001 |
-| 直连 LangGraph | `cd backend && make dev` | LangGraph auth | 2024 |
+| 直连 LangGraph 兼容性 | 手动运行 LangGraph 工具链时使用 | LangGraph auth | 2024 |
+
+`make dev`、Docker dev 和生产部署默认都运行 Gateway embedded runtime。
+`app.gateway.langgraph_auth` 仅用于保留的直连 LangGraph 工具链 / Studio 兼容性测试，不是标准服务启动路径。
 
 每种模式下都需执行以下测试。
 
@@ -21,10 +23,8 @@
 # 清除已有数据
 rm -f backend/.deer-flow/data/deerflow.db
 
-# 选择模式启动
+# 启动标准模式（Gateway embedded runtime）
-make dev          # 标准模式
+make dev
-# 或
-make dev-pro      # Gateway 模式
 ```
 
 **验证点：**
@@ -57,7 +57,7 @@ make dev
 
 ## 二、接口流程测试
 
-> 以下用 `BASE=http://localhost:2026` 为例。标准模式和 Gateway 模式都用此地址。
+> 以下用 `BASE=http://localhost:2026` 为例。标准模式经 nginx 暴露此地址。
 > 直连测试替换为对应端口。
 >
 > **CSRF token 提取**：多处用到从 cookie jar 提取 CSRF token，统一使用：
@@ -211,20 +211,18 @@ curl -s -X POST $BASE/api/threads/search \
 
 **预期：** 返回 0 或仅包含 user2 自己的 thread
 
-### 2.3 标准模式 LangGraph Server 隔离
+### 2.3 LangGraph-compatible Gateway 路由隔离
 
-> 仅在标准模式下测试。Gateway 模式不跑 LangGraph Server。
+#### TC-API-10: LangGraph-compatible 端点需要 cookie
-
-#### TC-API-10: LangGraph 端点需要 cookie
 
 ```bash
-# 不带 cookie 访问 LangGraph 接口
+# 不带 cookie 访问 LangGraph-compatible 接口
 curl -s -w "%{http_code}" $BASE/api/langgraph/threads
 ```
 
 **预期：** 401
 
-#### TC-API-11: LangGraph 带 cookie 可访问
+#### TC-API-11: LangGraph-compatible 路由带 cookie 可访问
 
 ```bash
 curl -s $BASE/api/langgraph/threads -b user1.txt | jq length
@@ -232,10 +230,10 @@ curl -s $BASE/api/langgraph/threads -b user1.txt | jq length
 
 **预期：** 200，返回 user1 的 thread 列表
 
-#### TC-API-12: LangGraph 隔离 — 用户只看到自己的
+#### TC-API-12: LangGraph-compatible 路由隔离 — 用户只看到自己的
 
 ```bash
-# user2 查 LangGraph threads
+# user2 查 threads
 curl -s $BASE/api/langgraph/threads -b user2.txt | jq length
 ```
 
@@ -1234,21 +1232,11 @@ P2=$(awk -F': ' '/^password:/ {print $2}' /tmp/deerflow-reset-p2.txt)
 ## 七、模式差异测试
 
 > 以下用 `GW=http://localhost:8001` 表示直连 Gateway，`BASE=http://localhost:2026` 表示经 nginx。
-> Gateway 模式启动命令：`make dev-pro`（或 `./scripts/serve.sh --dev --gateway`）。
+> 标准启动命令：`make dev`（或 `./scripts/serve.sh --dev`）。
 
-### 7.1 标准模式独有
+### 7.1 标准启动模式
 
-> 启动命令：`make dev`（或 `./scripts/serve.sh --dev`）
+#### TC-MODE-01: Gateway AuthMiddleware 的 token_version 检查
-
-#### TC-MODE-01: LangGraph Server 独立运行，需 cookie
-
-```bash
-# 无 cookie 访问 LangGraph
-curl -s -w "%{http_code}" -o /dev/null $BASE/api/langgraph/threads/search
-# 预期: 403（LangGraph auth handler 拒绝）
-```
-
-#### TC-MODE-02: LangGraph auth 的 token_version 检查
 
 ```bash
 # 登录拿 cookie
@@ -1261,9 +1249,9 @@ curl -s -X POST $BASE/api/v1/auth/change-password \
   -b cookies.txt -H "Content-Type: application/json" -H "X-CSRF-Token: $CSRF" \
   -d '{"current_password":"正确密码","new_password":"NewPass1!"}' -c new_cookies.txt
 
-# 用旧 cookie 访问 LangGraph
+# 用旧 cookie 访问 LangGraph-compatible 路由
 curl -s -w "%{http_code}" $BASE/api/langgraph/threads/search -b cookies.txt
-# 预期: 403（token_version 不匹配）
+# 预期: 401（token_version 不匹配）
 
 # 用新 cookie 访问
 CSRF2=$(grep csrf_token new_cookies.txt | awk '{print $NF}')
@@ -1272,7 +1260,7 @@ curl -s -w "%{http_code}" -X POST $BASE/api/langgraph/threads/search \
 # 预期: 200
 ```
 
-#### TC-MODE-03: LangGraph auth 的 owner filter 隔离
+#### TC-MODE-02: Gateway owner filter 隔离
 
 ```bash
 # user1 创建 thread
@@ -1297,18 +1285,9 @@ print('OK: user2 sees', len(threads), 'threads, none belong to user1')
 "
 ```
 
-### 7.2 Gateway 模式独有
+#### TC-MODE-03: 所有请求经 AuthMiddleware
-
-> 启动命令：`make dev-pro`（或 `./scripts/serve.sh --dev --gateway`）
-> 无 LangGraph Server 进程，agent runtime 嵌入 Gateway。
-
-#### TC-MODE-04: 所有请求经 AuthMiddleware
 
 ```bash
-# 确认 LangGraph Server 未运行
-curl -s -w "%{http_code}" -o /dev/null http://localhost:2024/ok
-# 预期: 000（连接被拒）
-
 # Gateway API 受保护
 curl -s -w "%{http_code}" -o /dev/null $BASE/api/models
 # 预期: 401
@@ -1319,7 +1298,7 @@ curl -s -w "%{http_code}" -o /dev/null -X POST $BASE/api/langgraph/threads/searc
 # 预期: 401
 ```
 
-#### TC-MODE-05: Gateway 模式下完整 auth 流程
+#### TC-MODE-04: 标准模式下完整 auth 流程
 
 ```bash
 # 登录
@@ -1334,7 +1313,7 @@ curl -s -X POST $BASE/api/langgraph/threads \
   -d '{"metadata":{}}' | python3 -c "import sys,json; print(json.load(sys.stdin)['thread_id'])"
 # 预期: 返回 thread_id
 
-# CSRF 保护（Gateway 模式下 CSRFMiddleware 直接覆盖所有路由）
+# CSRF 保护（CSRFMiddleware 覆盖所有 Gateway 路由）
 curl -s -w "%{http_code}" -o /dev/null -X POST $BASE/api/langgraph/threads \
   -b cookies.txt -H "Content-Type: application/json" -d '{"metadata":{}}'
 # 预期: 403（CSRF token missing）
@@ -1433,7 +1412,7 @@ done
 
 ### 7.4 Docker 部署
 
-> 启动命令：`./scripts/deploy.sh`（标准）或 `./scripts/deploy.sh --gateway`（Gateway 模式）
+> 启动命令：`./scripts/deploy.sh`
 > Docker Compose 文件：`docker/docker-compose.yaml`
 >
 > 前置条件：
@@ -1542,16 +1521,16 @@ docker logs deer-flow-gateway 2>&1 | grep -iE "Password: .{15,}" && echo "FAIL:
 - 容器日志输出**路径**（不是密码本身），符合 CodeQL `py/clear-text-logging-sensitive-data` 规则
 - `grep "Password:"` 在日志中**应当无匹配**（旧行为已废弃，simplify pass 移除了日志泄露路径）
 
-#### TC-DOCKER-06: Gateway 模式 Docker 部署
+#### TC-DOCKER-06: Docker 部署
 
 ```bash
-# Gateway 模式：无 langgraph 容器
+# 标准 Docker 模式：runtime 嵌入 gateway 容器
-./scripts/deploy.sh --gateway
+./scripts/deploy.sh
 sleep 15
 
-# 确认 langgraph 容器不存在
+# 确认 gateway 容器存在
-docker ps --filter name=deer-flow-langgraph --format '{{.Names}}' | wc -l
+docker ps --filter name=deer-flow-gateway --format '{{.Names}}'
-# 预期: 0
+# 预期: deer-flow-gateway
 
 # auth 流程正常：未登录受保护接口返回 401
 curl -s -w "%{http_code}" -o /dev/null $BASE/api/models

backend/docs/BLOCKING_IO_DETECTION.md

@@ -0,0 +1,154 @@
+# Blocking IO detection usage and maintenance
+
+This document describes how to use and maintain DeerFlow backend blocking-IO
+detection for async event-loop safety.
+
+The goal is narrow: find and prevent synchronous IO from blocking backend
+async event-loop paths. Static and runtime detection are complementary, but
+they have different jobs.
+
+## Static detector
+
+The static detector is the discovery tool. It scans backend source code and
+reports candidate blocking-IO call sites that may need human review.
+
+Run it from the repository root:
+
+```bash
+make detect-blocking-io
+```
+
+Or from `backend/`:
+
+```bash
+make detect-blocking-io
+```
+
+The report is written to:
+
+```text
+.deer-flow/blocking-io-findings.json
+```
+
+Use this output for review and triage. A static finding is a candidate, not
+proof that production blocks the event loop at runtime. The current static
+rules are intentionally broad; prefer triaging existing output before adding
+new static rules.
+
+Add a static rule only when review finds a recurring high-risk blocking
+pattern that is invisible to the current detector.
+
+## Runtime detector
+
+The runtime detector is the CI regression guard. It uses Blockbuster to fail a
+focused test when code under `app.*` or `deerflow.*` performs blocking IO on
+the asyncio event-loop thread.
+
+Run it from `backend/`:
+
+```bash
+make test-blocking-io
+```
+
+The runtime gate starts from confirmed production bugs and protects those
+paths from regressing. It does not prove that the entire backend is free of
+blocking IO; it only covers the production paths exercised by
+`backend/tests/blocking_io/`.
+
+## Maintenance workflow
+
+Use the static detector to find candidates, then use review to decide which
+async production paths are worth protecting in CI.
+
+The normal workflow is:
+
+1. Run the static detector to find backend blocking-IO candidates.
+2. Use human review to pick high-risk production async paths.
+3. Add or update a focused runtime anchor in `backend/tests/blocking_io/`.
+4. Let CI prevent that path from regressing.
+
+Runtime detection has two maintenance paths.
+
+### Add a runtime rule
+
+Add a runtime rule when Blockbuster's default rules do not cover a generic
+blocking primitive used by production code.
+
+Rules belong in:
+
+```text
+backend/tests/support/detectors/blocking_io_runtime.py
+```
+
+Add them to `_PROJECT_BLOCKING_RULES`, not directly inside individual tests.
+Keeping rules centralized makes it clear which extra primitives DeerFlow
+expects Blockbuster to catch.
+
+Example shape:
+
+```python
+import subprocess
+
+from blockbuster import BlockBusterFunction
+
+_PROJECT_BLOCKING_RULES = (
+    (
+        "subprocess.Popen.__init__",
+        BlockBusterFunction(
+            subprocess.Popen,
+            "__init__",
+            scanned_modules=["app", "deerflow"],
+        ),
+    ),
+)
+```
+
+Do not add a runtime rule just because a business path is not tested. A rule
+only expands what Blockbuster can intercept after code runs.
+
+### Add a runtime anchor
+
+Add a runtime anchor when a high-risk async production path should be protected
+by CI but no existing `backend/tests/blocking_io/` test executes it.
+
+Anchors belong in:
+
+```text
+backend/tests/blocking_io/
+```
+
+A good anchor should:
+
+- Call the real production async entry point.
+- Avoid bypassing the blocking surface with test-only `asyncio.to_thread`
+  wrappers.
+- Use real local filesystem inputs when the bug shape is filesystem IO.
+- Mock only the external dependency boundary, such as a network service or
+  third-party saver class.
+- Fail if a future change moves the blocking operation back onto the event
+  loop.
+
+Avoid testing only the low-level helper unless that helper is the production
+async entry point. The runtime gate is most useful when it protects the caller
+that production actually executes.
+
+## Current runtime coverage
+
+The runtime anchors protect confirmed blocking-IO bug shapes:
+
+- SQLite checkpointer setup, including path resolution and parent-directory
+  creation.
+- Subagent skill metadata loading through `SubagentExecutor._load_skills()`.
+- `JsonlRunEventStore` async API (`put` / `list_*` / `delete_*`): the JSONL
+  run-event backend offloads its synchronous file IO via `asyncio.to_thread`
+  (fix #3084); this anchor drives the real async API under the gate so any
+  blocking IO reintroduced on the loop fails, not only removal of one
+  `to_thread` call.
+- `UploadsMiddleware.before_agent` uploads-directory scan: a sync-only middleware
+  hook runs on the event loop under async graph execution, so the scan is
+  offloaded via `abefore_agent` + `run_in_executor`.
+- Gate health checks: Blockbuster catches unoffloaded calls, opt-out works, and
+  patches are restored after exceptions.
+
+As static detection and review identify more high-risk async paths, add new
+runtime anchors incrementally.

backend/docs/CONFIGURATION.md

@@ -36,6 +36,7 @@ models:
 - OpenAI (`langchain_openai:ChatOpenAI`)
 - Anthropic (`langchain_anthropic:ChatAnthropic`)
 - DeepSeek (`langchain_deepseek:ChatDeepSeek`)
+- Xiaomi MiMo (`deerflow.models.patched_mimo:PatchedChatMiMo`)
 - Claude Code OAuth (`deerflow.models.claude_provider:ClaudeChatModel`)
 - Codex CLI (`deerflow.models.openai_codex_provider:CodexChatModel`)
 - Any LangChain-compatible provider
@@ -166,6 +167,37 @@ models:
 
 For Gemini accessed **without** thinking (e.g. via OpenRouter where thinking is not activated), the plain `langchain_openai:ChatOpenAI` with `supports_thinking: false` is sufficient and no patch is needed.
 
+**MiMo with thinking via OpenAI-compatible API**:
+
+MiMo returns `reasoning_content` on assistant messages in thinking mode. In multi-turn agent conversations with tool calls, subsequent requests must preserve that historical `reasoning_content` on assistant messages or the MiMo API can return HTTP 400. Standard `langchain_openai:ChatOpenAI` drops this provider-specific field, so use `deerflow.models.patched_mimo:PatchedChatMiMo`:
+
+For pay-as-you-go API keys (`sk-...`), use `https://api.xiaomimimo.com/v1`. For Token Plan keys (`tp-...`), use the regional Token Plan Base URL shown in the MiMo console, such as `https://token-plan-cn.xiaomimimo.com/v1`. MiMo documents these key types as separate and non-interchangeable.
+
+`PatchedChatMiMo` is model-id agnostic. Use it for every MiMo thinking model entry you configure, including model entries referenced by `subagents.*.model` overrides (for example `mimo-v2.5-pro`, `mimo-v2.5`, `mimo-v2-pro`, `mimo-v2-omni`, or `mimo-v2-flash`).
+
+```yaml
+models:
+  - name: mimo-v2.5-pro
+    display_name: MiMo V2.5 Pro
+    use: deerflow.models.patched_mimo:PatchedChatMiMo
+    model: mimo-v2.5-pro
+    api_key: $MIMO_API_KEY
+    base_url: https://api.xiaomimimo.com/v1
+    max_tokens: 8192
+    supports_thinking: true
+    supports_vision: false
+    when_thinking_enabled:
+      extra_body:
+        thinking:
+          type: enabled
+    when_thinking_disabled:
+      extra_body:
+        thinking:
+          type: disabled
+```
+
+`PatchedChatMiMo` preserves MiMo's `choices[].message.reasoning_content`, streaming `delta.reasoning_content`, and request-history assistant `reasoning_content` fields. It does not reuse the DeepSeek provider.
+
 ### Tool Groups
 
 Organize tools into logical groups:
@@ -319,6 +351,7 @@ models:
 - `OPENAI_API_KEY` - OpenAI API key
 - `ANTHROPIC_API_KEY` - Anthropic API key
 - `DEEPSEEK_API_KEY` - DeepSeek API key
+- `MIMO_API_KEY` - Xiaomi MiMo API key
 - `NOVITA_API_KEY` - Novita API key (OpenAI-compatible endpoint)
 - `TAVILY_API_KEY` - Tavily search API key
 - `DEER_FLOW_PROJECT_ROOT` - Project root for relative runtime paths

backend/docs/MCP_SERVER.md

@@ -14,6 +14,19 @@ DeerFlow supports configurable MCP servers and skills to extend its capabilities
 3. Configure each server’s command, arguments, and environment variables as needed.
 4. Restart the application to load and register MCP tools.
 
+## Filesystem MCP Servers
+
+DeerFlow already provides built-in file tools for thread-scoped workspace access.
+Do not add an MCP filesystem server for the same DeerFlow workspace. The
+overlapping file tools use different path semantics, which can make LLM tool
+selection and file access behavior unstable.
+
+DeerFlow does not currently adapt the MCP Roots mode for filesystem servers. In
+particular, it does not publish per-thread MCP roots or map DeerFlow sandbox
+paths such as `/mnt/user-data/...` to paths accepted by
+`@modelcontextprotocol/server-filesystem`. Use DeerFlow's built-in file tools
+for DeerFlow workspace files.
+
 ## OAuth Support (HTTP/SSE MCP Servers)
 
 For `http` and `sse` MCP servers, DeerFlow supports OAuth token acquisition and automatic token refresh.
@@ -88,7 +101,6 @@ MCP servers expose tools that are automatically discovered and integrated into D
 
 MCP servers can provide access to:
 
-- **File systems**
 - **Databases** (e.g., PostgreSQL)
 - **External APIs** (e.g., GitHub, Brave Search)
 - **Browser automation** (e.g., Puppeteer)
@@ -97,4 +109,4 @@ MCP servers can provide access to:
 ## Learn More
 
 For detailed documentation about the Model Context Protocol, visit:  
-https://modelcontextprotocol.io
+https://modelcontextprotocol.io

backend/docs/TODO.md

@@ -26,7 +26,7 @@
   - Replace sync `requests` with `httpx.AsyncClient` in community tools (tavily, jina_ai, firecrawl, infoquest, image_search)
   - [x] Replace sync `model.invoke()` with async `model.ainvoke()` in title_middleware and memory updater
   - Consider `asyncio.to_thread()` wrapper for remaining blocking file I/O
-  - For production: use `langgraph up` (multi-worker) instead of `langgraph dev` (single-worker)
+  - For production: tune Gateway worker/runtime settings for long-running agent workloads
 
 ## Resolved Issues
 

backend/docs/middleware-execution-flow.md

@@ -4,22 +4,22 @@
 
 `create_deerflow_agent` 通过 `RuntimeFeatures` 组装的完整 middleware 链（默认全开时）：
 
-| # | Middleware | `before_agent` | `before_model` | `after_model` | `after_agent` | `wrap_tool_call` | 主 Agent | Subagent | 来源 |
+| # | Middleware | `before_agent` | `before_model` | `after_model` | `after_agent` | `wrap_model_call` | `wrap_tool_call` | 主 Agent | Subagent | 来源 |
-|---|-----------|:-:|:-:|:-:|:-:|:-:|:-:|:-:|------|
+|---|-----------|:-:|:-:|:-:|:-:|:-:|:-:|:-:|:-:|------|
-| 0 | ThreadDataMiddleware | ✓ | | | | | ✓ | ✓ | `sandbox` |
+| 0 | ThreadDataMiddleware | ✓ | | | | | | ✓ | ✓ | `sandbox` |
-| 1 | UploadsMiddleware | ✓ | | | | | ✓ | ✗ | `sandbox` |
+| 1 | UploadsMiddleware | ✓ | | | | | | ✓ | ✗ | `sandbox` |
-| 2 | SandboxMiddleware | ✓ | | | ✓ | | ✓ | ✓ | `sandbox` |
+| 2 | SandboxMiddleware | ✓ | | | ✓ | | | ✓ | ✓ | `sandbox` |
-| 3 | DanglingToolCallMiddleware | | | ✓ | | | ✓ | ✗ | 始终开启 |
+| 3 | DanglingToolCallMiddleware | | | | | ✓ | | ✓ | ✗ | 始终开启 |
-| 4 | GuardrailMiddleware | | | | | ✓ | ✓ | ✓ | *Phase 2 纳入* |
+| 4 | GuardrailMiddleware | | | | | | ✓ | ✓ | ✓ | *Phase 2 纳入* |
-| 5 | ToolErrorHandlingMiddleware | | | | | ✓ | ✓ | ✓ | 始终开启 |
+| 5 | ToolErrorHandlingMiddleware | | | | | | ✓ | ✓ | ✓ | 始终开启 |
-| 6 | SummarizationMiddleware | | | ✓ | | | ✓ | ✗ | `summarization` |
+| 6 | SummarizationMiddleware | | ✓ | | | | | ✓ | ✗ | `summarization` |
-| 7 | TodoMiddleware | | | ✓ | | | ✓ | ✗ | `plan_mode` 参数 |
+| 7 | TodoMiddleware | | ✓ | ✓ | | ✓ | | ✓ | ✗ | `plan_mode` 参数 |
-| 8 | TitleMiddleware | | | ✓ | | | ✓ | ✗ | `auto_title` |
+| 8 | TitleMiddleware | | | ✓ | | | | ✓ | ✗ | `auto_title` |
-| 9 | MemoryMiddleware | | | | ✓ | | ✓ | ✗ | `memory` |
+| 9 | MemoryMiddleware | | | | ✓ | | | ✓ | ✗ | `memory` |
-| 10 | ViewImageMiddleware | | ✓ | | | | ✓ | ✗ | `vision` |
+| 10 | ViewImageMiddleware | | ✓ | | | | | ✓ | ✗ | `vision` |
-| 11 | SubagentLimitMiddleware | | | ✓ | | | ✓ | ✗ | `subagent` |
+| 11 | SubagentLimitMiddleware | | | ✓ | | | | ✓ | ✗ | `subagent` |
-| 12 | LoopDetectionMiddleware | | | ✓ | | | ✓ | ✗ | 始终开启 |
+| 12 | LoopDetectionMiddleware | ✓ | | ✓ | ✓ | ✓ | | ✓ | ✗ | 始终开启 |
-| 13 | ClarificationMiddleware | | | ✓ | | | ✓ | ✗ | 始终最后 |
+| 13 | ClarificationMiddleware | | | | | | ✓ | ✓ | ✗ | 始终最后 |
 
 主 agent **14 个** middleware（`make_lead_agent`），subagent **4 个**（ThreadData、Sandbox、Guardrail、ToolErrorHandling）。`create_deerflow_agent` Phase 1 实现 **13 个**（Guardrail 仅支持自定义实例，无内置默认）。
 
@@ -35,7 +35,7 @@ graph TB
 
     subgraph BA ["<b>before_agent</b> 正序 0→N"]
         direction TB
-        TD["[0] ThreadData<br/>创建线程目录"] --> UL["[1] Uploads<br/>扫描上传文件"] --> SB["[2] Sandbox<br/>获取沙箱"]
+        TD["[0] ThreadData<br/>创建线程目录"] --> UL["[1] Uploads<br/>扫描上传文件"] --> SB["[2] Sandbox<br/>获取沙箱"] --> LD_BA["[12] LoopDetection<br/>清理 stale warning"]
     end
 
     subgraph BM ["<b>before_model</b> 正序 0→N"]
@@ -43,34 +43,42 @@ graph TB
         VI["[10] ViewImage<br/>注入图片 base64"]
     end
 
-    SB --> VI
+    subgraph WM ["<b>wrap_model_call</b>"]
-    VI --> M["<b>MODEL</b>"]
+        direction TB
+        DTC_WM["[3] DanglingToolCall<br/>补悬空 ToolMessage"] --> LD_WM["[12] LoopDetection<br/>注入当前 run warning"]
+    end
+
+    LD_BA --> VI
+    VI --> DTC_WM
+    LD_WM --> M["<b>MODEL</b>"]
 
     subgraph AM ["<b>after_model</b> 反序 N→0"]
         direction TB
-        CL["[13] Clarification<br/>拦截 ask_clarification"] --> LD["[12] LoopDetection<br/>检测循环"] --> SL["[11] SubagentLimit<br/>截断多余 task"] --> TI["[8] Title<br/>生成标题"] --> SM["[6] Summarization<br/>上下文压缩"] --> DTC["[3] DanglingToolCall<br/>补缺失 ToolMessage"]
+        LD["[12] LoopDetection<br/>检测循环/排队 warning"] --> SL["[11] SubagentLimit<br/>截断多余 task"] --> TI["[8] Title<br/>生成标题"]
     end
 
-    M --> CL
+    M --> LD
 
     subgraph AA ["<b>after_agent</b> 反序 N→0"]
         direction TB
-        SBR["[2] Sandbox<br/>释放沙箱"] --> MEM["[9] Memory<br/>入队记忆"]
+        LD_CLEAN["[12] LoopDetection<br/>清理 pending warning"] --> MEM["[9] Memory<br/>入队记忆"] --> SBR["[2] Sandbox<br/>释放沙箱"]
     end
 
-    DTC --> SBR
+    TI --> LD_CLEAN
-    MEM --> END(["response"])
+    SBR --> END(["response"])
 
     classDef beforeNode fill:#a0a8b5,stroke:#636b7a,color:#2d3239
     classDef modelNode fill:#b5a8a0,stroke:#7a6b63,color:#2d3239
+    classDef wrapModelNode fill:#a8a0b5,stroke:#6b637a,color:#2d3239
     classDef afterModelNode fill:#b5a0a8,stroke:#7a636b,color:#2d3239
     classDef afterAgentNode fill:#a0b5a8,stroke:#637a6b,color:#2d3239
     classDef terminalNode fill:#a8b5a0,stroke:#6b7a63,color:#2d3239
 
-    class TD,UL,SB,VI beforeNode
+    class TD,UL,SB,LD_BA,VI beforeNode
+    class DTC_WM,LD_WM wrapModelNode
     class M modelNode
-    class CL,LD,SL,TI,SM,DTC afterModelNode
+    class LD,SL,TI afterModelNode
-    class SBR,MEM afterAgentNode
+    class LD_CLEAN,SBR,MEM afterAgentNode
     class START,END terminalNode
 ```
 
@@ -82,13 +90,12 @@ sequenceDiagram
     participant TD as ThreadDataMiddleware
     participant UL as UploadsMiddleware
     participant SB as SandboxMiddleware
+    participant LD as LoopDetectionMiddleware
     participant VI as ViewImageMiddleware
+    participant DTC as DanglingToolCallMiddleware
     participant M as MODEL
-    participant CL as ClarificationMiddleware
     participant SL as SubagentLimitMiddleware
     participant TI as TitleMiddleware
-    participant SM as SummarizationMiddleware
-    participant DTC as DanglingToolCallMiddleware
     participant MEM as MemoryMiddleware
 
     U ->> TD: invoke
@@ -103,19 +110,26 @@ sequenceDiagram
     activate SB
     Note right of SB: before_agent 获取沙箱
 
-    SB ->> VI: before_model
+    SB ->> LD: before_agent
+    activate LD
+    Note right of LD: before_agent 清理同 thread 旧 run 的 pending warning
+    LD ->> VI: before_model
     activate VI
     Note right of VI: before_model 注入图片 base64
 
-    VI ->> M: messages + tools
+    VI ->> DTC: wrap_model_call
+    activate DTC
+    Note right of DTC: wrap_model_call 补悬空 ToolMessage
+    DTC ->> LD: wrap_model_call
+    Note right of LD: wrap_model_call drain 当前 run warning 并追加到末尾
+    LD ->> M: messages + tools
     activate M
-    M -->> CL: AI response
+    M -->> LD: AI response
     deactivate M
 
-    activate CL
+    Note right of LD: after_model 检测循环；warning 入队，hard-stop 清 tool_calls
-    Note right of CL: after_model 拦截 ask_clarification
+    LD -->> SL: after_model
-    CL -->> SL: after_model
+    deactivate LD
-    deactivate CL
 
     activate SL
     Note right of SL: after_model 截断多余 task
@@ -124,22 +138,18 @@ sequenceDiagram
 
     activate TI
     Note right of TI: after_model 生成标题
-    TI -->> SM: after_model
+    TI -->> DTC: done
     deactivate TI
 
-    activate SM
-    Note right of SM: after_model 上下文压缩
-    SM -->> DTC: after_model
-    deactivate SM
-
-    activate DTC
-    Note right of DTC: after_model 补缺失 ToolMessage
-    DTC -->> VI: done
     deactivate DTC
 
     VI -->> SB: done
     deactivate VI
 
+    Note right of LD: after_agent 清理当前 run 未消费 warning
+
+    Note right of MEM: after_agent 入队记忆
+
     Note right of SB: after_agent 释放沙箱
     SB -->> UL: done
     deactivate SB
@@ -147,8 +157,6 @@ sequenceDiagram
     UL -->> TD: done
     deactivate UL
 
-    Note right of MEM: after_agent 入队记忆
-
     TD -->> U: response
     deactivate TD
 ```
@@ -224,12 +232,12 @@ sequenceDiagram
     participant TD as ThreadData
     participant UL as Uploads
     participant SB as Sandbox
+    participant LD as LoopDetection
     participant VI as ViewImage
+    participant DTC as DanglingToolCall
     participant M as MODEL
-    participant CL as Clarification
     participant SL as SubagentLimit
     participant TI as Title
-    participant SM as Summarization
     participant MEM as Memory
 
     U ->> TD: invoke
@@ -238,34 +246,40 @@ sequenceDiagram
     Note right of UL: before_agent 扫描文件
     UL ->> SB: .
     Note right of SB: before_agent 获取沙箱
+    SB ->> LD: .
+    Note right of LD: before_agent 清理 stale pending warning
 
     loop 每轮对话（tool call 循环）
         SB ->> VI: .
         Note right of VI: before_model 注入图片
-        VI ->> M: messages + tools
+        VI ->> DTC: .
-        M -->> CL: AI response
+        Note right of DTC: wrap_model_call 补悬空工具结果
-        Note right of CL: after_model 拦截 ask_clarification
+        DTC ->> LD: .
-        CL -->> SL: .
+        Note right of LD: wrap_model_call 注入当前 run warning
+        LD ->> M: messages + tools
+        M -->> LD: AI response
+        Note right of LD: after_model 检测循环/排队 warning
+        LD -->> SL: .
         Note right of SL: after_model 截断多余 task
         SL -->> TI: .
         Note right of TI: after_model 生成标题
-        TI -->> SM: .
-        Note right of SM: after_model 上下文压缩
     end
 
-    Note right of SB: after_agent 释放沙箱
+    Note right of LD: after_agent 清理当前 run pending warning
-    SB -->> MEM: .
+    LD -->> MEM: .
     Note right of MEM: after_agent 入队记忆
-    MEM -->> U: response
+    MEM -->> SB: .
+    Note right of SB: after_agent 释放沙箱
+    SB -->> U: response
 ```
 
 > [!warning] 不是洋葱
-> 14 个 middleware 中只有 SandboxMiddleware 有 before/after 对称（获取/释放）。其余都是单向的：要么只在 `before_*` 做事，要么只在 `after_*` 做事。`before_agent` / `after_agent` 只跑一次，`before_model` / `after_model` 每轮循环都跑。
+> 大部分 middleware 只用一个阶段。SandboxMiddleware 使用 `before_agent`/`after_agent` 做资源获取/释放；LoopDetectionMiddleware 也使用这两个钩子，但用途是清理 run-scoped pending warnings，不是资源生命周期对称。`before_agent` / `after_agent` 只跑一次，`before_model` / `after_model` / `wrap_model_call` 每轮循环都跑。
 
 硬依赖只有 2 处：
 
 1. **ThreadData 在 Sandbox 之前** — sandbox 需要线程目录
-2. **Clarification 在列表最后** — `after_model` 反序时最先执行，第一个拦截 `ask_clarification`
+2. **Clarification 在列表最后** — `wrap_tool_call` 处理 `ask_clarification` 时优先拦截，并通过 `Command(goto=END)` 中断执行
 
 ### 结论
 
@@ -273,19 +287,19 @@ sequenceDiagram
 |---|---|---|
 | 每个 middleware | before + after 对称 | 大多只用一个钩子 |
 | 激活条 | 嵌套（外长内短） | 不嵌套（串行） |
-| 反序的意义 | 清理与初始化配对 | 仅影响 after_model 的执行优先级 |
+| 反序的意义 | 清理与初始化配对 | 影响 `after_model` / `after_agent` 的执行优先级 |
 | 典型例子 | Auth: 校验 token / 清理上下文 | ThreadData: 只创建目录，没有清理 |
 
 ## 关键设计点
 
 ### ClarificationMiddleware 为什么在列表最后？
 
-位置最后 = `after_model` 最先执行。它需要**第一个**看到 model 输出，检查是否有 `ask_clarification` tool call。如果有，立即中断（`Command(goto=END)`），后续 middleware 的 `after_model` 不再执行。
+位置最后使它在工具调用包装链中优先拦截 `ask_clarification`。如果命中，它返回 `Command(goto=END)`，把格式化后的澄清问题写成 `ToolMessage` 并中断执行。
 
 ### SandboxMiddleware 的对称性
 
 `before_agent`（正序第 3 个）获取沙箱，`after_agent`（反序第 1 个）释放沙箱。外层进入 → 外层退出，天然的洋葱对称。
 
-### 大部分 middleware 只用一个钩子
+### LoopDetectionMiddleware 为什么同时用多个钩子？
 
-14 个 middleware 中，只有 SandboxMiddleware 同时用了 `before_agent` + `after_agent`（获取/释放）。其余都只在一个阶段执行。洋葱模型的反序特性主要影响 `after_model` 阶段的执行顺序。
+`after_model` 只做检测：重复工具调用达到 warning 阈值时，把 warning 放入 `(thread_id, run_id)` 作用域的 pending 队列。真正注入发生在下一次 `wrap_model_call`：此时上一轮 `AIMessage(tool_calls)` 对应的 `ToolMessage` 已经在请求里，warning 追加在末尾，不会破坏 OpenAI/Moonshot 的 tool-call pairing。`before_agent` 清理同一 thread 下旧 run 的残留 warning，`after_agent` 清理当前 run 没被消费的 warning。

backend/packages/harness/deerflow/agents/lead_agent/agent.py

@@ -1,3 +1,23 @@
+"""Lead agent factory.
+
+INVARIANT — tracing callback placement
+======================================
+
+Tracing callbacks (Langfuse, LangSmith) are attached at the **graph
+invocation root** in :func:`_make_lead_agent` (see the
+``build_tracing_callbacks()`` block that appends to ``config["callbacks"]``).
+Every ``create_chat_model(...)`` call inside this module — and inside any
+middleware reachable from this graph (e.g. ``TitleMiddleware``) — MUST pass
+``attach_tracing=False``.
+
+Forgetting that flag emits duplicate spans (one rooted at the graph, one at
+the model) AND prevents the Langfuse handler's ``propagate_attributes``
+path from firing, so ``session_id`` / ``user_id`` never reach the trace.
+The four current sites are: bootstrap agent, default agent, summarization
+middleware, and the async path inside ``TitleMiddleware``. Any new in-graph
+``create_chat_model`` call must add to this list and pass the flag.
+"""
+
 import logging
 
 from langchain.agents import create_agent
@@ -9,6 +29,7 @@ from deerflow.agents.memory.summarization_hook import memory_flush_hook
 from deerflow.agents.middlewares.clarification_middleware import ClarificationMiddleware
 from deerflow.agents.middlewares.loop_detection_middleware import LoopDetectionMiddleware
 from deerflow.agents.middlewares.memory_middleware import MemoryMiddleware
+from deerflow.agents.middlewares.safety_finish_reason_middleware import SafetyFinishReasonMiddleware
 from deerflow.agents.middlewares.subagent_limit_middleware import SubagentLimitMiddleware
 from deerflow.agents.middlewares.summarization_middleware import BeforeSummarizationHook, DeerFlowSummarizationMiddleware
 from deerflow.agents.middlewares.title_middleware import TitleMiddleware
@@ -22,6 +43,7 @@ from deerflow.config.app_config import AppConfig, get_app_config
 from deerflow.models import create_chat_model
 from deerflow.skills.tool_policy import filter_tools_by_skill_allowed_tools
 from deerflow.skills.types import Skill
+from deerflow.tracing import build_tracing_callbacks
 
 logger = logging.getLogger(__name__)
 
@@ -73,10 +95,14 @@ def _create_summarization_middleware(*, app_config: AppConfig | None = None) ->
     # Bind "middleware:summarize" tag so RunJournal identifies these LLM calls
     # as middleware rather than lead_agent (SummarizationMiddleware is a
     # LangChain built-in, so we tag the model at creation time).
+    # attach_tracing=False because the graph-level RunnableConfig (set in
+    # ``_make_lead_agent``) already carries tracing callbacks; binding them
+    # again at the model level would emit duplicate spans and break
+    # ``session_id`` / ``user_id`` propagation.
     if config.model_name:
-        model = create_chat_model(name=config.model_name, thinking_enabled=False, app_config=resolved_app_config)
+        model = create_chat_model(name=config.model_name, thinking_enabled=False, app_config=resolved_app_config, attach_tracing=False)
     else:
-        model = create_chat_model(thinking_enabled=False, app_config=resolved_app_config)
+        model = create_chat_model(thinking_enabled=False, app_config=resolved_app_config, attach_tracing=False)
     model = model.with_config(tags=["middleware:summarize"])
 
     # Prepare kwargs
@@ -313,6 +339,15 @@ def _build_middlewares(
     if custom_middlewares:
         middlewares.extend(custom_middlewares)
 
+    # SafetyFinishReasonMiddleware — suppress tool execution when the provider
+    # safety-terminated the response. Registered after custom middlewares so
+    # that LangChain's reverse-order after_model dispatch runs Safety first;
+    # cleared tool_calls then flow through Loop/Subagent accounting without
+    # firing extra alarms. See safety_finish_reason_middleware.py docstring.
+    safety_config = resolved_app_config.safety_finish_reason
+    if safety_config.enabled:
+        middlewares.append(SafetyFinishReasonMiddleware.from_config(safety_config))
+
     # ClarificationMiddleware should always be last
     middlewares.append(ClarificationMiddleware())
     return middlewares
@@ -408,13 +443,26 @@ def _make_lead_agent(config: RunnableConfig, *, app_config: AppConfig):
         }
     )
 
+    # Inject tracing callbacks at the graph invocation root so a single LangGraph
+    # run produces one trace with all node / LLM / tool calls as child spans,
+    # AND so the Langfuse handler sees ``on_chain_start(parent_run_id=None)`` and
+    # actually propagates ``langfuse_session_id`` / ``langfuse_user_id`` from
+    # ``config["metadata"]`` onto the trace. Without root-level attachment the
+    # model is a nested observation and the handler strips ``langfuse_*`` keys.
+    tracing_callbacks = build_tracing_callbacks()
+    if tracing_callbacks:
+        existing = config.get("callbacks") or []
+        if not isinstance(existing, list):
+            existing = list(existing)
+        config["callbacks"] = [*existing, *tracing_callbacks]
+
     skills_for_tool_policy = _load_enabled_skills_for_tool_policy(available_skills, app_config=resolved_app_config)
 
     if is_bootstrap:
         # Special bootstrap agent with minimal prompt for initial custom agent creation flow
         tools = get_available_tools(model_name=model_name, subagent_enabled=subagent_enabled, app_config=resolved_app_config) + [setup_agent]
         return create_agent(
-            model=create_chat_model(name=model_name, thinking_enabled=thinking_enabled, app_config=resolved_app_config),
+            model=create_chat_model(name=model_name, thinking_enabled=thinking_enabled, app_config=resolved_app_config, attach_tracing=False),
             tools=filter_tools_by_skill_allowed_tools(tools, skills_for_tool_policy),
             middleware=_build_middlewares(config, model_name=model_name, app_config=resolved_app_config),
             system_prompt=apply_prompt_template(
@@ -432,7 +480,7 @@ def _make_lead_agent(config: RunnableConfig, *, app_config: AppConfig):
     # Default lead agent (unchanged behavior)
     tools = get_available_tools(model_name=model_name, groups=agent_config.tool_groups if agent_config else None, subagent_enabled=subagent_enabled, app_config=resolved_app_config)
     return create_agent(
-        model=create_chat_model(name=model_name, thinking_enabled=thinking_enabled, reasoning_effort=reasoning_effort, app_config=resolved_app_config),
+        model=create_chat_model(name=model_name, thinking_enabled=thinking_enabled, reasoning_effort=reasoning_effort, app_config=resolved_app_config, attach_tracing=False),
         tools=filter_tools_by_skill_allowed_tools(tools + extra_tools, skills_for_tool_policy),
         middleware=_build_middlewares(config, model_name=model_name, agent_name=agent_name, app_config=resolved_app_config),
         system_prompt=apply_prompt_template(

backend/packages/harness/deerflow/agents/memory/updater.py

@@ -227,6 +227,110 @@ def _extract_text(content: Any) -> str:
     return str(content)
 
 
+_REQUIRED_MEMORY_UPDATE_TOP_LEVEL_KEYS = frozenset({"user", "history", "newFacts", "factsToRemove"})
+
+
+def _normalize_memory_update_fact(fact: Any) -> dict[str, Any] | None:
+    """Normalize a single fact entry from a model-produced memory update."""
+    if not isinstance(fact, dict):
+        return None
+
+    raw_content = fact.get("content")
+    if not isinstance(raw_content, str):
+        return None
+    content = raw_content.strip()
+    if not content:
+        return None
+
+    raw_category = fact.get("category")
+    category = raw_category.strip() if isinstance(raw_category, str) and raw_category.strip() else "context"
+
+    raw_confidence = fact.get("confidence", 0.5)
+    if isinstance(raw_confidence, bool):
+        return None
+    if isinstance(raw_confidence, str):
+        raw_confidence = raw_confidence.strip()
+        if not raw_confidence:
+            return None
+        try:
+            raw_confidence = float(raw_confidence)
+        except ValueError:
+            return None
+    elif isinstance(raw_confidence, (int, float)):
+        raw_confidence = float(raw_confidence)
+    else:
+        return None
+
+    if not math.isfinite(raw_confidence):
+        return None
+
+    normalized_fact = {
+        "content": content,
+        "category": category,
+        "confidence": raw_confidence,
+    }
+    source_error = fact.get("sourceError")
+    if isinstance(source_error, str):
+        normalized_source_error = source_error.strip()
+        if normalized_source_error:
+            normalized_fact["sourceError"] = normalized_source_error
+
+    return normalized_fact
+
+
+def _normalize_memory_update_data(update_data: dict[str, Any]) -> dict[str, Any]:
+    """Coerce parsed memory update data into the shape consumed by _apply_updates."""
+    user = update_data.get("user")
+    history = update_data.get("history")
+    new_facts = update_data.get("newFacts")
+    facts_to_remove = update_data.get("factsToRemove")
+    normalized_facts_to_remove = [fact_id for fact_id in facts_to_remove if isinstance(fact_id, str)] if isinstance(facts_to_remove, list) else []
+    normalized_new_facts = []
+    dropped_new_fact = not isinstance(new_facts, list)
+    if isinstance(new_facts, list):
+        for fact in new_facts:
+            normalized_fact = _normalize_memory_update_fact(fact)
+            if normalized_fact is not None:
+                normalized_new_facts.append(normalized_fact)
+            else:
+                dropped_new_fact = True
+
+    if normalized_facts_to_remove and dropped_new_fact:
+        raise json.JSONDecodeError(
+            "Unsafe partial memory update: factsToRemove with malformed newFacts",
+            json.dumps(update_data, ensure_ascii=False),
+            0,
+        )
+
+    return {
+        "user": user if isinstance(user, dict) else {},
+        "history": history if isinstance(history, dict) else {},
+        "newFacts": normalized_new_facts,
+        "factsToRemove": normalized_facts_to_remove,
+    }
+
+
+def _parse_memory_update_response(response_content: Any) -> dict[str, Any]:
+    """Parse the first valid memory-update JSON object from an LLM response.
+
+    Some providers may wrap JSON in thinking traces, prose, or markdown fences
+    even when prompted to return JSON only. This parser accepts safely
+    extractable JSON objects but does not repair truncated or malformed JSON.
+    """
+    response_text = _extract_text(response_content).strip()
+    decoder = json.JSONDecoder()
+
+    for match in re.finditer(r"\{", response_text):
+        try:
+            parsed, _end = decoder.raw_decode(response_text[match.start() :])
+        except json.JSONDecodeError:
+            continue
+        if isinstance(parsed, dict) and _REQUIRED_MEMORY_UPDATE_TOP_LEVEL_KEYS.issubset(parsed):
+            return _normalize_memory_update_data(parsed)
+
+    raise json.JSONDecodeError("No valid memory update JSON object found", response_text, 0)
+
+
 # Matches sentences that describe a file-upload *event* rather than general
 # file-related work.  Deliberately narrow to avoid removing legitimate facts
 # such as "User works with CSV files" or "prefers PDF export".
@@ -338,7 +442,7 @@ class MemoryUpdater:
             reinforcement_detected=reinforcement_detected,
         )
         prompt = MEMORY_UPDATE_PROMPT.format(
-            current_memory=json.dumps(current_memory, indent=2),
+            current_memory=json.dumps(current_memory, indent=2, ensure_ascii=False),
             conversation=conversation_text,
             correction_hint=correction_hint,
         )
@@ -353,13 +457,7 @@ class MemoryUpdater:
         user_id: str | None = None,
     ) -> bool:
         """Parse the model response, apply updates, and persist memory."""
-        response_text = _extract_text(response_content).strip()
+        update_data = _parse_memory_update_response(response_content)
-
-        if response_text.startswith("```"):
-            lines = response_text.split("\n")
-            response_text = "\n".join(lines[1:-1] if lines[-1] == "```" else lines[1:])
-
-        update_data = json.loads(response_text)
         # Deep-copy before in-place mutation so a subsequent save() failure
         # cannot corrupt the still-cached original object reference.
         updated_memory = self._apply_updates(copy.deepcopy(current_memory), update_data, thread_id)

backend/packages/harness/deerflow/agents/middlewares/dangling_tool_call_middleware.py

@@ -15,6 +15,7 @@ to the end of the message list as before_model + add_messages reducer would do.
 
 import json
 import logging
+from collections import defaultdict, deque
 from collections.abc import Awaitable, Callable
 from typing import override
 
@@ -25,6 +26,11 @@ from langchain_core.messages import ToolMessage
 
 logger = logging.getLogger(__name__)
 
+# Workaround for issue #2894: malformed write_file calls can carry huge Markdown
+# payloads in invalid tool-call args. Keep recovery error details short so the
+# synthetic ToolMessage does not echo large or malformed content back to the model.
+_MAX_RECOVERY_ERROR_DETAIL_LEN = 500
+
 
 class DanglingToolCallMiddleware(AgentMiddleware[AgentState]):
     """Inserts placeholder ToolMessages for dangling tool calls before model invocation.
@@ -97,9 +103,25 @@ class DanglingToolCallMiddleware(AgentMiddleware[AgentState]):
     @staticmethod
     def _synthetic_tool_message_content(tool_call: dict) -> str:
         if tool_call.get("invalid"):
+            name = tool_call.get("name")
             error = tool_call.get("error")
-            if isinstance(error, str) and error:
+            error_text = error[:_MAX_RECOVERY_ERROR_DETAIL_LEN] if isinstance(error, str) and error else ""
-                return f"[Tool call could not be executed because its arguments were invalid: {error}]"
+            # Workaround for issue #2894: malformed write_file calls can carry huge Markdown
+            # payloads in invalid tool-call args. Keep recovery guidance actionable without
+            # echoing large or malformed content back to the model.
+            if name == "write_file":
+                details = f" Parser error: {error_text}" if error_text else ""
+                return (
+                    "[write_file failed before execution: the tool-call arguments were not valid JSON, "
+                    "so no file was written. This often happens when the model tries to write a very "
+                    "large Markdown file in a single tool call, especially when `content` contains "
+                    "unescaped quotes, inline JSON, backslashes, or code fences. Do not retry the same "
+                    "large `write_file` payload for this artifact; provide the report/content directly "
+                    "as normal assistant text in your next response. If a file write is still needed "
+                    f"later, split the file into smaller sections instead of one large payload.{details}]"
+                )
+            if error_text:
+                return f"[Tool call could not be executed because its arguments were invalid: {error_text}]"
             return "[Tool call could not be executed because its arguments were invalid.]"
         return "[Tool call was interrupted and did not return a result.]"
 
@@ -109,10 +131,10 @@ class DanglingToolCallMiddleware(AgentMiddleware[AgentState]):
         This normalizes model-bound causal order before provider serialization while
         preserving already-valid transcripts unchanged.
         """
-        tool_messages_by_id: dict[str, ToolMessage] = {}
+        tool_messages_by_id: dict[str, deque[ToolMessage]] = defaultdict(deque)
         for msg in messages:
             if isinstance(msg, ToolMessage):
-                tool_messages_by_id.setdefault(msg.tool_call_id, msg)
+                tool_messages_by_id[msg.tool_call_id].append(msg)
 
         tool_call_ids: set[str] = set()
         for msg in messages:
@@ -124,7 +146,6 @@ class DanglingToolCallMiddleware(AgentMiddleware[AgentState]):
                     tool_call_ids.add(tc_id)
 
         patched: list = []
-        consumed_tool_msg_ids: set[str] = set()
         patch_count = 0
         for msg in messages:
             if isinstance(msg, ToolMessage) and msg.tool_call_id in tool_call_ids:
@@ -136,13 +157,13 @@ class DanglingToolCallMiddleware(AgentMiddleware[AgentState]):
 
             for tc in self._message_tool_calls(msg):
                 tc_id = tc.get("id")
-                if not tc_id or tc_id in consumed_tool_msg_ids:
+                if not tc_id:
                     continue
 
-                existing_tool_msg = tool_messages_by_id.get(tc_id)
+                tool_msg_queue = tool_messages_by_id.get(tc_id)
+                existing_tool_msg = tool_msg_queue.popleft() if tool_msg_queue else None
                 if existing_tool_msg is not None:
                     patched.append(existing_tool_msg)
-                    consumed_tool_msg_ids.add(tc_id)
                 else:
                     patched.append(
                         ToolMessage(
@@ -152,7 +173,6 @@ class DanglingToolCallMiddleware(AgentMiddleware[AgentState]):
                             status="error",
                         )
                     )
-                    consumed_tool_msg_ids.add(tc_id)
                     patch_count += 1
 
         if patched == messages:

backend/packages/harness/deerflow/agents/middlewares/loop_detection_middleware.py

@@ -6,10 +6,36 @@ arguments indefinitely until the recursion limit kills the run.
 Detection strategy:
   1. After each model response, hash the tool calls (name + args).
   2. Track recent hashes in a sliding window.
-  3. If the same hash appears >= warn_threshold times, inject a
+  3. If the same hash appears >= warn_threshold times, queue a
-     "you are repeating yourself — wrap up" system message (once per hash).
+     "you are repeating yourself — wrap up" warning for the current
+     thread/run. The warning is **injected at the next model call** (in
+     ``wrap_model_call``) as a ``HumanMessage`` appended to the message
+     list, *after* all ToolMessage responses to the previous
+     AIMessage(tool_calls).
   4. If it appears >= hard_limit times, strip all tool_calls from the
      response so the agent is forced to produce a final text answer.
+
+Why the warning is injected at ``wrap_model_call`` instead of
+``after_model``:
+
+  ``after_model`` fires immediately after the model emits an
+  ``AIMessage`` that may carry ``tool_calls``. The tools node has not
+  run yet, so no matching ``ToolMessage`` exists in the history. Any
+  message we add here lands *between* the assistant's tool_calls and
+  their responses. OpenAI/Moonshot reject the next request with
+  ``"tool_call_ids did not have response messages"`` because their
+  validators require the assistant's tool_calls to be followed
+  immediately by tool messages. Anthropic also disallows mid-stream
+  ``SystemMessage``. By deferring the warning to ``wrap_model_call``,
+  every prior ToolMessage is already present in the request's message
+  list and the warning is appended at the end — pairing intact, no
+  ``AIMessage`` semantics are mutated.
+
+Queued warnings are intentionally transient. If a run ends before the
+next model request drains a queued warning, ``after_agent`` drops it
+instead of carrying it into a later invocation for the same thread. The
+hard-stop path still forces termination when the configured safety limit
+is reached.
 """
 
 from __future__ import annotations
@@ -19,11 +45,14 @@ import json
 import logging
 import threading
 from collections import OrderedDict, defaultdict
+from collections.abc import Awaitable, Callable
 from copy import deepcopy
 from typing import TYPE_CHECKING, override
 
 from langchain.agents import AgentState
 from langchain.agents.middleware import AgentMiddleware
+from langchain.agents.middleware.types import ModelCallResult, ModelRequest, ModelResponse
+from langchain_core.messages import HumanMessage
 from langgraph.runtime import Runtime
 
 if TYPE_CHECKING:
@@ -38,6 +67,7 @@ _DEFAULT_WINDOW_SIZE = 20  # track last N tool calls
 _DEFAULT_MAX_TRACKED_THREADS = 100  # LRU eviction limit
 _DEFAULT_TOOL_FREQ_WARN = 30  # warn after 30 calls to the same tool type
 _DEFAULT_TOOL_FREQ_HARD_LIMIT = 50  # force-stop after 50 calls to the same tool type
+_MAX_PENDING_WARNINGS_PER_RUN = 4
 
 
 def _normalize_tool_call_args(raw_args: object) -> tuple[dict, str | None]:
@@ -195,6 +225,12 @@ class LoopDetectionMiddleware(AgentMiddleware[AgentState]):
         self._warned: dict[str, set[str]] = defaultdict(set)
         self._tool_freq: dict[str, dict[str, int]] = defaultdict(lambda: defaultdict(int))
         self._tool_freq_warned: dict[str, set[str]] = defaultdict(set)
+        # Per-thread/run queue of warnings to inject at the next model call.
+        # Populated by ``after_model`` (detection) and drained by
+        # ``wrap_model_call`` (injection); see module docstring.
+        self._pending_warnings: dict[tuple[str, str], list[str]] = defaultdict(list)
+        self._pending_warning_touch_order: OrderedDict[tuple[str, str], None] = OrderedDict()
+        self._max_pending_warning_keys = max(1, self.max_tracked_threads * 2)
 
     @classmethod
     def from_config(cls, config: LoopDetectionConfig) -> LoopDetectionMiddleware:
@@ -213,9 +249,20 @@ class LoopDetectionMiddleware(AgentMiddleware[AgentState]):
         """Extract thread_id from runtime context for per-thread tracking."""
         thread_id = runtime.context.get("thread_id") if runtime.context else None
         if thread_id:
-            return thread_id
+            return str(thread_id)
         return "default"
 
+    def _get_run_id(self, runtime: Runtime) -> str:
+        """Extract run_id from runtime context for per-run warning scoping."""
+        run_id = runtime.context.get("run_id") if runtime.context else None
+        if run_id:
+            return str(run_id)
+        return "default"
+
+    def _pending_key(self, runtime: Runtime) -> tuple[str, str]:
+        """Return the pending-warning key for the current thread/run."""
+        return self._get_thread_id(runtime), self._get_run_id(runtime)
+
     def _evict_if_needed(self) -> None:
         """Evict least recently used threads if over the limit.
 
@@ -226,8 +273,52 @@ class LoopDetectionMiddleware(AgentMiddleware[AgentState]):
             self._warned.pop(evicted_id, None)
             self._tool_freq.pop(evicted_id, None)
             self._tool_freq_warned.pop(evicted_id, None)
+            for key in list(self._pending_warnings):
+                if key[0] == evicted_id:
+                    self._drop_pending_warning_key_locked(key)
             logger.debug("Evicted loop tracking for thread %s (LRU)", evicted_id)
 
+    def _drop_pending_warning_key_locked(self, key: tuple[str, str]) -> None:
+        """Drop all pending-warning bookkeeping for one thread/run key.
+
+        Must be called while holding self._lock.
+        """
+        self._pending_warnings.pop(key, None)
+        self._pending_warning_touch_order.pop(key, None)
+
+    def _touch_pending_warning_key_locked(self, key: tuple[str, str]) -> None:
+        """Mark a pending-warning key as recently used.
+
+        Must be called while holding self._lock.
+        """
+        self._pending_warning_touch_order[key] = None
+        self._pending_warning_touch_order.move_to_end(key)
+
+    def _prune_pending_warning_state_locked(self, protected_key: tuple[str, str]) -> None:
+        """Cap pending-warning state across abnormal or concurrent runs.
+
+        Must be called while holding self._lock.
+        """
+        overflow = len(self._pending_warning_touch_order) - self._max_pending_warning_keys
+        if overflow <= 0:
+            return
+
+        candidates = [key for key in self._pending_warning_touch_order if key != protected_key]
+        for key in candidates[:overflow]:
+            self._drop_pending_warning_key_locked(key)
+
+    def _queue_pending_warning(self, runtime: Runtime, warning: str) -> None:
+        """Queue one transient warning for the current thread/run with caps."""
+        pending_key = self._pending_key(runtime)
+        with self._lock:
+            warnings = self._pending_warnings[pending_key]
+            if warning not in warnings:
+                warnings.append(warning)
+            if len(warnings) > _MAX_PENDING_WARNINGS_PER_RUN:
+                del warnings[: len(warnings) - _MAX_PENDING_WARNINGS_PER_RUN]
+            self._touch_pending_warning_key_locked(pending_key)
+            self._prune_pending_warning_state_locked(protected_key=pending_key)
+
     def _track_and_check(self, state: AgentState, runtime: Runtime) -> tuple[str | None, bool]:
         """Track tool calls and check for loops.
 
@@ -268,6 +359,12 @@ class LoopDetectionMiddleware(AgentMiddleware[AgentState]):
             if len(history) > self.window_size:
                 history[:] = history[-self.window_size :]
 
+            warned_hashes = self._warned.get(thread_id)
+            if warned_hashes is not None:
+                warned_hashes.intersection_update(history)
+                if not warned_hashes:
+                    self._warned.pop(thread_id, None)
+
             count = history.count(call_hash)
             tool_names = [tc.get("name", "?") for tc in tool_calls]
 
@@ -381,7 +478,10 @@ class LoopDetectionMiddleware(AgentMiddleware[AgentState]):
         warning, hard_stop = self._track_and_check(state, runtime)
 
         if hard_stop:
-            # Strip tool_calls from the last AIMessage to force text output
+            # Strip tool_calls from the last AIMessage to force text output.
+            # Once tool_calls are stripped, the AIMessage no longer requires
+            # matching ToolMessage responses, so mutating it in place here
+            # is safe for OpenAI/Moonshot pairing validators.
             messages = state.get("messages", [])
             last_msg = messages[-1]
             content = self._append_text(last_msg.content, warning or _HARD_STOP_MSG)
@@ -389,33 +489,48 @@ class LoopDetectionMiddleware(AgentMiddleware[AgentState]):
             return {"messages": [stripped_msg]}
 
         if warning:
-            # WORKAROUND for v2.0-m1 — see #2724.
+            # Defer injection to the next model call. We must NOT alter the
-            #
+            # AIMessage(tool_calls=...) here (would put framework words in
-            # Append the warning to the AIMessage content instead of
+            # the model's mouth, polluting downstream consumers like
-            # injecting a separate HumanMessage. Inserting any non-tool
+            # MemoryMiddleware), nor insert a separate non-tool message
-            # message between an AIMessage(tool_calls=...) and its
+            # (would break OpenAI/Moonshot tool-call pairing because the
-            # ToolMessage responses breaks OpenAI/Moonshot strict pairing
+            # tools node has not produced ToolMessage responses yet). The
-            # validation ("tool_call_ids did not have response messages")
+            # warning is delivered via ``wrap_model_call`` below.
-            # because the tools node has not run yet at after_model time.
+            self._queue_pending_warning(runtime, warning)
-            # tool_calls are preserved so the tools node still executes.
+            return None
-            #
-            # This is a temporary mitigation: mutating an existing
-            # AIMessage to carry framework-authored text leaks loop-warning
-            # text into downstream consumers (MemoryMiddleware fact
-            # extraction, TitleMiddleware, telemetry, model replay) as if
-            # the model said it. The proper fix is to defer warning
-            # injection from after_model to wrap_model_call so every prior
-            # ToolMessage is already in the request — see RFC #2517 (which
-            # lists "loop intervention does not leave invalid
-            # tool-call/tool-message state" as acceptance criteria) and
-            # the prototype on `fix/loop-detection-tool-call-pairing`.
-            messages = state.get("messages", [])
-            last_msg = messages[-1]
-            patched_msg = last_msg.model_copy(update={"content": self._append_text(last_msg.content, warning)})
-            return {"messages": [patched_msg]}
 
         return None
 
+    def _clear_other_run_pending_warnings(self, runtime: Runtime) -> None:
+        """Drop stale pending warnings for previous runs in this thread."""
+        thread_id, current_run_id = self._pending_key(runtime)
+        with self._lock:
+            for key in list(self._pending_warnings):
+                if key[0] == thread_id and key[1] != current_run_id:
+                    self._drop_pending_warning_key_locked(key)
+
+    def _clear_current_run_pending_warnings(self, runtime: Runtime) -> None:
+        """Drop pending warnings owned by the current thread/run."""
+        pending_key = self._pending_key(runtime)
+        with self._lock:
+            self._drop_pending_warning_key_locked(pending_key)
+
+    @staticmethod
+    def _format_warning_message(warnings: list[str]) -> str:
+        """Merge pending warnings into one prompt message."""
+        deduped = list(dict.fromkeys(warnings))
+        return "\n\n".join(deduped)
+
+    @override
+    def before_agent(self, state: AgentState, runtime: Runtime) -> dict | None:
+        self._clear_other_run_pending_warnings(runtime)
+        return None
+
+    @override
+    async def abefore_agent(self, state: AgentState, runtime: Runtime) -> dict | None:
+        self._clear_other_run_pending_warnings(runtime)
+        return None
+
     @override
     def after_model(self, state: AgentState, runtime: Runtime) -> dict | None:
         return self._apply(state, runtime)
@@ -424,6 +539,59 @@ class LoopDetectionMiddleware(AgentMiddleware[AgentState]):
     async def aafter_model(self, state: AgentState, runtime: Runtime) -> dict | None:
         return self._apply(state, runtime)
 
+    @override
+    def after_agent(self, state: AgentState, runtime: Runtime) -> dict | None:
+        self._clear_current_run_pending_warnings(runtime)
+        return None
+
+    @override
+    async def aafter_agent(self, state: AgentState, runtime: Runtime) -> dict | None:
+        self._clear_current_run_pending_warnings(runtime)
+        return None
+
+    def _drain_pending_warnings(self, runtime: Runtime) -> list[str]:
+        """Pop and return all queued warnings for *runtime*'s thread/run."""
+        pending_key = self._pending_key(runtime)
+        with self._lock:
+            warnings = self._pending_warnings.pop(pending_key, [])
+            self._pending_warning_touch_order.pop(pending_key, None)
+        return warnings
+
+    def _augment_request(self, request: ModelRequest) -> ModelRequest:
+        """Append queued loop warnings (if any) to the outgoing message list.
+
+        The warning is placed *after* every existing message, including the
+        ToolMessage responses to the previous AIMessage(tool_calls). This
+        keeps ``assistant tool_calls -> tool_messages`` pairing intact for
+        OpenAI/Moonshot, avoids the Anthropic mid-stream SystemMessage
+        restriction (we use HumanMessage), and never mutates an existing
+        AIMessage.
+        """
+        warnings = self._drain_pending_warnings(request.runtime)
+        if not warnings:
+            return request
+        new_messages = [
+            *request.messages,
+            HumanMessage(content=self._format_warning_message(warnings), name="loop_warning"),
+        ]
+        return request.override(messages=new_messages)
+
+    @override
+    def wrap_model_call(
+        self,
+        request: ModelRequest,
+        handler: Callable[[ModelRequest], ModelResponse],
+    ) -> ModelCallResult:
+        return handler(self._augment_request(request))
+
+    @override
+    async def awrap_model_call(
+        self,
+        request: ModelRequest,
+        handler: Callable[[ModelRequest], Awaitable[ModelResponse]],
+    ) -> ModelCallResult:
+        return await handler(self._augment_request(request))
+
     def reset(self, thread_id: str | None = None) -> None:
         """Clear tracking state. If thread_id given, clear only that thread."""
         with self._lock:
@@ -432,8 +600,13 @@ class LoopDetectionMiddleware(AgentMiddleware[AgentState]):
                 self._warned.pop(thread_id, None)
                 self._tool_freq.pop(thread_id, None)
                 self._tool_freq_warned.pop(thread_id, None)
+                for key in list(self._pending_warnings):
+                    if key[0] == thread_id:
+                        self._drop_pending_warning_key_locked(key)
             else:
                 self._history.clear()
                 self._warned.clear()
                 self._tool_freq.clear()
                 self._tool_freq_warned.clear()
+                self._pending_warnings.clear()
+                self._pending_warning_touch_order.clear()

backend/packages/harness/deerflow/agents/middlewares/safety_finish_reason_middleware.py

@@ -0,0 +1,317 @@
+"""Suppress tool execution when the provider safety-terminated the response.
+
+Background — see issue bytedance/deer-flow#3028.
+
+Some providers (OpenAI ``finish_reason='content_filter'``, Anthropic
+``stop_reason='refusal'``, Gemini ``finish_reason='SAFETY'`` ...) can stop
+generation mid-stream while still returning partially-formed ``tool_calls``.
+LangChain's tool router treats any AIMessage with a non-empty ``tool_calls``
+field as "go execute these", so half-truncated arguments — e.g. a markdown
+``write_file`` that stops in the middle of a sentence — get dispatched as if
+they were complete. The agent then sees the truncated file, tries to fix it,
+gets filtered again, and loops.
+
+This middleware sits at ``after_model`` and gates that behaviour: when a
+configured ``SafetyTerminationDetector`` fires *and* the AIMessage carries
+tool calls, we strip the tool calls (both structured and raw provider
+payloads), append a user-facing explanation, and stash observability fields
+in ``additional_kwargs.safety_termination`` so logs, traces, and SSE
+consumers can see what happened.
+
+Hook choice: ``after_model`` (not ``wrap_model_call``) because the response
+is a *normal* return — not an exception — and we want to participate in the
+same after-model chain as ``LoopDetectionMiddleware``, with which we share
+the same tool-call-suppression mechanic but a different trigger.
+
+Placement: register *after* ``LoopDetectionMiddleware`` in the middleware
+list. LangChain factory wires ``after_model`` edges in reverse list order
+(``langchain/agents/factory.py:add_edge("model", middleware_w_after_model[-1])``,
+then walks ``range(len-1, 0, -1)``), so the *last* registered middleware is
+the *first* to observe the model output. Registering Safety after Loop
+means Safety sees the raw response first, clears tool calls if it fires,
+and Loop then accounts against the cleaned message.
+"""
+
+from __future__ import annotations
+
+import logging
+from typing import TYPE_CHECKING, override
+
+from langchain.agents import AgentState
+from langchain.agents.middleware import AgentMiddleware
+from langchain_core.messages import AIMessage
+from langgraph.runtime import Runtime
+
+from deerflow.agents.middlewares.safety_termination_detectors import (
+    SafetyTermination,
+    SafetyTerminationDetector,
+    default_detectors,
+)
+from deerflow.agents.middlewares.tool_call_metadata import clone_ai_message_with_tool_calls
+
+if TYPE_CHECKING:
+    from deerflow.config.safety_finish_reason_config import SafetyFinishReasonConfig
+
+logger = logging.getLogger(__name__)
+
+
+_USER_FACING_MESSAGE = (
+    "The model provider stopped this response with a safety-related signal "
+    "({reason_field}={reason_value!r}, detector={detector!r}). Any tool "
+    "calls produced in this turn were suppressed because their arguments "
+    "may be truncated and unsafe to execute. Please rephrase the request "
+    "or ask for a narrower output."
+)
+
+
+class SafetyFinishReasonMiddleware(AgentMiddleware[AgentState]):
+    """Strip tool_calls from AIMessages flagged by a SafetyTerminationDetector."""
+
+    def __init__(self, detectors: list[SafetyTerminationDetector] | None = None) -> None:
+        super().__init__()
+        # Copy so caller mutations after construction don't leak into us.
+        self._detectors: list[SafetyTerminationDetector] = list(detectors) if detectors else default_detectors()
+
+    @classmethod
+    def from_config(cls, config: SafetyFinishReasonConfig) -> SafetyFinishReasonMiddleware:
+        """Construct from validated Pydantic config, honouring the
+        reflection-loaded detector list when provided.
+
+        An explicit empty list is intentionally rejected — it would silently
+        disable detection while leaving the middleware in the chain, which
+        is the worst of both worlds. Use ``enabled: false`` instead.
+        """
+        if config.detectors is None:
+            return cls()
+
+        if not config.detectors:
+            raise ValueError("safety_finish_reason.detectors must be omitted (use built-ins) or contain at least one entry; use enabled=false to disable the middleware entirely.")
+
+        from deerflow.reflection import resolve_variable
+
+        detectors: list[SafetyTerminationDetector] = []
+        for entry in config.detectors:
+            detector_cls = resolve_variable(entry.use)
+            kwargs = dict(entry.config) if entry.config else {}
+            detector = detector_cls(**kwargs)
+            if not isinstance(detector, SafetyTerminationDetector):
+                raise TypeError(f"{entry.use} did not produce a SafetyTerminationDetector (got {type(detector).__name__}); ensure it has a `name` attribute and a `detect(message)` method")
+            detectors.append(detector)
+        return cls(detectors=detectors)
+
+    # ----- detection -------------------------------------------------------
+
+    def _detect(self, message: AIMessage) -> SafetyTermination | None:
+        for detector in self._detectors:
+            try:
+                hit = detector.detect(message)
+            except Exception:  # noqa: BLE001 - never let a buggy detector break the agent run
+                logger.exception("SafetyTerminationDetector %r raised; treating as no-match", getattr(detector, "name", type(detector).__name__))
+                continue
+            if hit is not None:
+                return hit
+        return None
+
+    # ----- message rewriting ----------------------------------------------
+
+    @staticmethod
+    def _append_user_message(content: object, text: str) -> str | list:
+        """Append a plain-text explanation to AIMessage content.
+
+        Mirrors ``LoopDetectionMiddleware._append_text`` so list-content
+        responses (Anthropic thinking blocks, vLLM reasoning splits) keep
+        their structure instead of being string-coerced into a TypeError.
+        """
+        if content is None or content == "":
+            return text
+        if isinstance(content, list):
+            return [*content, {"type": "text", "text": f"\n\n{text}"}]
+        if isinstance(content, str):
+            return content + f"\n\n{text}"
+        return str(content) + f"\n\n{text}"
+
+    def _build_suppressed_message(
+        self,
+        message: AIMessage,
+        termination: SafetyTermination,
+    ) -> AIMessage:
+        suppressed_names = [tc.get("name") or "unknown" for tc in (message.tool_calls or [])]
+        explanation = _USER_FACING_MESSAGE.format(
+            reason_field=termination.reason_field,
+            reason_value=termination.reason_value,
+            detector=termination.detector,
+        )
+        new_content = self._append_user_message(message.content, explanation)
+
+        # clone_ai_message_with_tool_calls handles structured tool_calls,
+        # raw additional_kwargs.tool_calls, and function_call in one shot.
+        # It only rewrites finish_reason when the old value was "tool_calls",
+        # which is not our case — content_filter / refusal / SAFETY stay put
+        # so downstream SSE / converters keep seeing the real provider reason.
+        cleared = clone_ai_message_with_tool_calls(message, [], content=new_content)
+
+        # Re-clone additional_kwargs so we don't accidentally mutate the
+        # dict returned by clone_ai_message_with_tool_calls (which already
+        # made a shallow copy, but downstream model_copy still references
+        # it). Then stamp the observability record.
+        kwargs = dict(getattr(cleared, "additional_kwargs", None) or {})
+        kwargs["safety_termination"] = {
+            "detector": termination.detector,
+            "reason_field": termination.reason_field,
+            "reason_value": termination.reason_value,
+            "suppressed_tool_call_count": len(suppressed_names),
+            "suppressed_tool_call_names": suppressed_names,
+            "extras": dict(termination.extras) if termination.extras else {},
+        }
+        return cleared.model_copy(update={"additional_kwargs": kwargs})
+
+    # ----- observability ---------------------------------------------------
+
+    def _emit_event(
+        self,
+        termination: SafetyTermination,
+        suppressed_names: list[str],
+        runtime: Runtime,
+    ) -> None:
+        """Notify SSE consumers (e.g. the web UI) that a tool turn was
+        suppressed so they can reconcile any "tool starting..." placeholders
+        already streamed to the user. Failures are logged at debug and
+        ignored — this is a best-effort signal."""
+        try:
+            from langgraph.config import get_stream_writer
+
+            writer = get_stream_writer()
+        except Exception:  # noqa: BLE001
+            logger.debug("get_stream_writer unavailable; skipping safety_termination event", exc_info=True)
+            return
+
+        thread_id = None
+        if runtime is not None and getattr(runtime, "context", None):
+            thread_id = runtime.context.get("thread_id") if isinstance(runtime.context, dict) else None
+
+        try:
+            writer(
+                {
+                    "type": "safety_termination",
+                    "detector": termination.detector,
+                    "reason_field": termination.reason_field,
+                    "reason_value": termination.reason_value,
+                    "suppressed_tool_call_count": len(suppressed_names),
+                    "suppressed_tool_call_names": suppressed_names,
+                    "thread_id": thread_id,
+                }
+            )
+        except Exception:  # noqa: BLE001
+            logger.debug("Failed to emit safety_termination stream event", exc_info=True)
+
+    def _record_audit_event(
+        self,
+        termination: SafetyTermination,
+        message,
+        tool_calls: list[dict],
+        runtime: Runtime,
+    ) -> None:
+        """Write a ``middleware:safety_termination`` record to RunEventStore
+        for post-run auditability.
+
+        The custom stream event in ``_emit_event`` is consumed by live SSE
+        clients and disappears after the run; this event is persisted so an
+        operator can answer "which runs were safety-suppressed today?" from
+        a single SQL query without joining the message body. Worker exposes
+        the run-scoped ``RunJournal`` via ``runtime.context["__run_journal"]``;
+        absent in unit-test / subagent / no-event-store paths, in which case
+        we silently skip.
+
+        Tool **arguments** are deliberately **not** recorded — those are the
+        very content the provider filtered; persisting them would defeat the
+        purpose of the safety filter. Names / count / ids are sufficient for
+        audit and debugging (issue #3028 review).
+        """
+        journal = None
+        if runtime is not None and getattr(runtime, "context", None):
+            context = runtime.context
+            if isinstance(context, dict):
+                journal = context.get("__run_journal")
+        if journal is None:
+            return
+
+        suppressed_names = [tc.get("name") or "unknown" for tc in tool_calls]
+        suppressed_ids = [tc.get("id") for tc in tool_calls if tc.get("id")]
+
+        changes = {
+            "detector": termination.detector,
+            "reason_field": termination.reason_field,
+            "reason_value": termination.reason_value,
+            "suppressed_tool_call_count": len(tool_calls),
+            "suppressed_tool_call_names": suppressed_names,
+            "suppressed_tool_call_ids": suppressed_ids,
+            "message_id": getattr(message, "id", None),
+            "extras": dict(termination.extras) if termination.extras else {},
+        }
+
+        try:
+            journal.record_middleware(
+                tag="safety_termination",
+                name=type(self).__name__,
+                hook="after_model",
+                action="suppress_tool_calls",
+                changes=changes,
+            )
+        except Exception:  # noqa: BLE001
+            # Audit-event persistence must never break agent execution.
+            logger.debug("Failed to record middleware:safety_termination event", exc_info=True)
+
+    # ----- main apply ------------------------------------------------------
+
+    def _apply(self, state: AgentState, runtime: Runtime) -> dict | None:
+        messages = state.get("messages", [])
+        if not messages:
+            return None
+
+        last = messages[-1]
+        if not isinstance(last, AIMessage):
+            return None
+
+        # Issue scope: only intervene when there's something to suppress.
+        # ``content_filter`` without tool_calls is allowed through unchanged
+        # so the partial text response (if any) reaches the user naturally.
+        tool_calls = last.tool_calls
+        if not tool_calls:
+            return None
+
+        termination = self._detect(last)
+        if termination is None:
+            return None
+
+        patched = self._build_suppressed_message(last, termination)
+
+        thread_id = None
+        if runtime is not None and getattr(runtime, "context", None):
+            thread_id = runtime.context.get("thread_id") if isinstance(runtime.context, dict) else None
+
+        logger.warning(
+            "Provider safety termination detected — suppressed %d tool call(s)",
+            len(tool_calls),
+            extra={
+                "thread_id": thread_id,
+                "detector": termination.detector,
+                "reason_field": termination.reason_field,
+                "reason_value": termination.reason_value,
+                "suppressed_tool_call_names": [tc.get("name") for tc in tool_calls],
+            },
+        )
+
+        self._emit_event(termination, [tc.get("name") or "unknown" for tc in tool_calls], runtime)
+        self._record_audit_event(termination, last, list(tool_calls), runtime)
+
+        return {"messages": [patched]}
+
+    # ----- hooks -----------------------------------------------------------
+
+    @override
+    def after_model(self, state: AgentState, runtime: Runtime) -> dict | None:
+        return self._apply(state, runtime)
+
+    @override
+    async def aafter_model(self, state: AgentState, runtime: Runtime) -> dict | None:
+        return self._apply(state, runtime)

backend/packages/harness/deerflow/agents/middlewares/safety_termination_detectors.py

@@ -0,0 +1,237 @@
+"""Detectors for provider-side safety termination signals.
+
+Different LLM providers signal "I stopped this response for safety reasons"
+through different fields with different values. This module defines a small
+strategy interface and three built-in detectors that cover the major
+providers DeerFlow supports today. New providers (Wenxin, Hunyuan, Bedrock
+adapters, in-house gateways, ...) can be added by implementing
+``SafetyTerminationDetector`` and wiring it through
+``config.yaml: safety_finish_reason.detectors``.
+
+The middleware that consumes these detectors lives in
+``safety_finish_reason_middleware.py``.
+"""
+
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import Any, Protocol, runtime_checkable
+
+from langchain_core.messages import AIMessage
+
+
+@dataclass(frozen=True)
+class SafetyTermination:
+    """A detected safety-related termination signal.
+
+    Attributes:
+        detector: Name of the detector that produced this result. Used for
+            observability so operators can see which provider rule fired.
+        reason_field: The message metadata field that carried the signal
+            (e.g. ``finish_reason``, ``stop_reason``).
+        reason_value: The actual value of that field
+            (e.g. ``content_filter``, ``refusal``, ``SAFETY``).
+        extras: Provider-specific metadata that may help downstream
+            consumers (e.g. Azure OpenAI content_filter_results, Gemini
+            safety_ratings). Detectors are free to populate or skip this.
+    """
+
+    detector: str
+    reason_field: str
+    reason_value: str
+    extras: dict[str, Any] = field(default_factory=dict)
+
+
+@runtime_checkable
+class SafetyTerminationDetector(Protocol):
+    """Strategy interface for provider safety termination detection."""
+
+    name: str
+
+    def detect(self, message: AIMessage) -> SafetyTermination | None:
+        """Return a SafetyTermination if *message* indicates provider safety
+        termination, otherwise return ``None``.
+
+        Implementations must be side-effect free and tolerant of missing or
+        oddly-typed metadata — detectors run on every model response.
+        """
+        ...
+
+
+def _get_metadata_value(message: AIMessage, field_name: str) -> str | None:
+    """Read a string-typed value from either ``response_metadata`` or
+    ``additional_kwargs``.
+
+    LangChain provider adapters are inconsistent about where they stash
+    provider stop signals. Most modern adapters use ``response_metadata``,
+    but some legacy / passthrough paths still surface them via
+    ``additional_kwargs``. We check both, in that order, and only accept
+    string values — Pydantic enums or dicts are ignored so we never raise
+    on malformed inputs.
+    """
+    for container_name in ("response_metadata", "additional_kwargs"):
+        container = getattr(message, container_name, None) or {}
+        if not isinstance(container, dict):
+            continue
+        value = container.get(field_name)
+        if isinstance(value, str) and value:
+            return value
+    return None
+
+
+class OpenAICompatibleContentFilterDetector:
+    """OpenAI-compatible content_filter signal.
+
+    Covers OpenAI, Azure OpenAI, Moonshot/Kimi, DeepSeek, Mistral, vLLM,
+    Qwen (OpenAI-compatible mode), and any other adapter that follows the
+    OpenAI ``finish_reason`` convention.
+
+    Some Chinese providers ship custom OpenAI-compatible gateways that use
+    alternative tokens like ``sensitive`` or ``violation``. Extend the set
+    via the ``finish_reasons`` kwarg in config.
+    """
+
+    name = "openai_compatible_content_filter"
+
+    def __init__(self, finish_reasons: list[str] | tuple[str, ...] | None = None) -> None:
+        configured = finish_reasons if finish_reasons is not None else ("content_filter",)
+        self._finish_reasons: frozenset[str] = frozenset(r.lower() for r in configured)
+
+    def detect(self, message: AIMessage) -> SafetyTermination | None:
+        value = _get_metadata_value(message, "finish_reason")
+        if value is None or value.lower() not in self._finish_reasons:
+            return None
+
+        extras: dict[str, Any] = {}
+        # Azure OpenAI ships a structured content_filter_results block; carry it
+        # through so operators can see *what* was filtered without re-tracing.
+        response_metadata = getattr(message, "response_metadata", None) or {}
+        if isinstance(response_metadata, dict):
+            filter_results = response_metadata.get("content_filter_results")
+            if filter_results:
+                extras["content_filter_results"] = filter_results
+
+        return SafetyTermination(
+            detector=self.name,
+            reason_field="finish_reason",
+            reason_value=value,
+            extras=extras,
+        )
+
+
+class AnthropicRefusalDetector:
+    """Anthropic ``stop_reason == "refusal"`` signal.
+
+    Anthropic models surface safety refusals via a dedicated ``stop_reason``
+    rather than ``finish_reason``. See:
+    https://platform.claude.com/docs/en/test-and-evaluate/strengthen-guardrails/handle-streaming-refusals
+    """
+
+    name = "anthropic_refusal"
+
+    def __init__(self, stop_reasons: list[str] | tuple[str, ...] | None = None) -> None:
+        configured = stop_reasons if stop_reasons is not None else ("refusal",)
+        self._stop_reasons: frozenset[str] = frozenset(r.lower() for r in configured)
+
+    def detect(self, message: AIMessage) -> SafetyTermination | None:
+        value = _get_metadata_value(message, "stop_reason")
+        if value is None or value.lower() not in self._stop_reasons:
+            return None
+        return SafetyTermination(
+            detector=self.name,
+            reason_field="stop_reason",
+            reason_value=value,
+        )
+
+
+class GeminiSafetyDetector:
+    """Gemini / Vertex AI safety-related finish reasons.
+
+    Gemini uses the same ``finish_reason`` field as OpenAI but with an
+    enumerated upper-case taxonomy. The default set covers every Gemini
+    finish_reason that means "the model stopped because the content/image
+    tripped a safety, blocklist, recitation, or PII filter" — i.e. cases
+    where any tool_calls returned alongside are likely truncated/
+    unreliable. Full enum:
+    https://docs.cloud.google.com/python/docs/reference/aiplatform/latest/google.cloud.aiplatform_v1.types.Candidate.FinishReason
+
+    Intentionally **excluded** from the default set:
+    - ``STOP``                       — normal termination.
+    - ``MAX_TOKENS``                 — output length truncation, not safety
+                                       (same root failure mode as
+                                       content_filter, but issue #3028
+                                       scopes it out; expose separately if
+                                       desired).
+    - ``LANGUAGE`` / ``NO_IMAGE``    — capability mismatches, unrelated to
+                                       safety; tool_calls would be absent
+                                       anyway.
+    - ``MALFORMED_FUNCTION_CALL`` /
+      ``UNEXPECTED_TOOL_CALL``       — tool-call protocol errors. The
+                                       tool_calls are *also* unreliable
+                                       here, but the failure category is
+                                       distinct from safety filtering;
+                                       handle in a dedicated detector to
+                                       keep observability records honest.
+    - ``OTHER`` / ``IMAGE_OTHER`` /
+      ``FINISH_REASON_UNSPECIFIED``  — too broad to enable by default;
+                                       opt in via ``finish_reasons=`` if
+                                       your provider abuses these.
+    """
+
+    name = "gemini_safety"
+
+    _DEFAULT_FINISH_REASONS = (
+        # Text safety
+        "SAFETY",
+        "BLOCKLIST",
+        "PROHIBITED_CONTENT",
+        "SPII",
+        "RECITATION",
+        # Image safety (multimodal generation)
+        "IMAGE_SAFETY",
+        "IMAGE_PROHIBITED_CONTENT",
+        "IMAGE_RECITATION",
+    )
+
+    def __init__(self, finish_reasons: list[str] | tuple[str, ...] | None = None) -> None:
+        configured = finish_reasons if finish_reasons is not None else self._DEFAULT_FINISH_REASONS
+        self._finish_reasons: frozenset[str] = frozenset(r.upper() for r in configured)
+
+    def detect(self, message: AIMessage) -> SafetyTermination | None:
+        value = _get_metadata_value(message, "finish_reason")
+        if value is None or value.upper() not in self._finish_reasons:
+            return None
+
+        extras: dict[str, Any] = {}
+        response_metadata = getattr(message, "response_metadata", None) or {}
+        if isinstance(response_metadata, dict):
+            # Gemini surfaces per-category scoring under safety_ratings.
+            ratings = response_metadata.get("safety_ratings")
+            if ratings:
+                extras["safety_ratings"] = ratings
+
+        return SafetyTermination(
+            detector=self.name,
+            reason_field="finish_reason",
+            reason_value=value,
+            extras=extras,
+        )
+
+
+def default_detectors() -> list[SafetyTerminationDetector]:
+    """Built-in detector set used when no custom detectors are configured."""
+    return [
+        OpenAICompatibleContentFilterDetector(),
+        AnthropicRefusalDetector(),
+        GeminiSafetyDetector(),
+    ]
+
+
+__all__ = [
+    "AnthropicRefusalDetector",
+    "GeminiSafetyDetector",
+    "OpenAICompatibleContentFilterDetector",
+    "SafetyTermination",
+    "SafetyTerminationDetector",
+    "default_detectors",
+]

backend/packages/harness/deerflow/agents/middlewares/summarization_middleware.py

@@ -10,7 +10,6 @@ from typing import Any, Protocol, override, runtime_checkable
 from langchain.agents import AgentState
 from langchain.agents.middleware import SummarizationMiddleware
 from langchain_core.messages import AIMessage, AnyMessage, HumanMessage, RemoveMessage, ToolMessage
-from langchain_core.messages.utils import get_buffer_string
 from langgraph.config import get_config
 from langgraph.graph.message import REMOVE_ALL_MESSAGES
 from langgraph.runtime import Runtime
@@ -176,93 +175,12 @@ class DeerFlowSummarizationMiddleware(SummarizationMiddleware):
             ]
         }
 
-    @override
-    def _create_summary(self, messages_to_summarize: list[AnyMessage]) -> str:
-        """Generate summary without emitting streaming events to the client.
-
-        Suppresses callbacks to prevent the internal summarization LLM call from
-        producing visible AI message chunks in the frontend's ``messages-tuple``
-        stream (issue #2804).
-        """
-        if not messages_to_summarize:
-            return "No previous conversation history."
-
-        trimmed = self._trim_messages_for_summary(messages_to_summarize)
-        if not trimmed:
-            return "Previous conversation was too long to summarize."
-
-        formatted = get_buffer_string(trimmed)
-
-        try:
-            response = self.model.with_config(callbacks=[]).invoke(
-                self.summary_prompt.format(messages=formatted).rstrip(),
-                config={
-                    "metadata": {"lc_source": "summarization"},
-                    "callbacks": [],
-                },
-            )
-            return self._extract_summary_text(response)
-        except Exception as e:
-            return f"Error generating summary: {e!s}"
-
-    @override
-    async def _acreate_summary(self, messages_to_summarize: list[AnyMessage]) -> str:
-        """Generate summary without emitting streaming events to the client.
-
-        Suppresses callbacks to prevent the internal summarization LLM call from
-        producing visible AI message chunks in the frontend's ``messages-tuple``
-        stream (issue #2804).
-        """
-        if not messages_to_summarize:
-            return "No previous conversation history."
-
-        trimmed = self._trim_messages_for_summary(messages_to_summarize)
-        if not trimmed:
-            return "Previous conversation was too long to summarize."
-
-        formatted = get_buffer_string(trimmed)
-
-        try:
-            response = await self.model.with_config(callbacks=[]).ainvoke(
-                self.summary_prompt.format(messages=formatted).rstrip(),
-                config={
-                    "metadata": {"lc_source": "summarization"},
-                    "callbacks": [],
-                },
-            )
-            return self._extract_summary_text(response)
-        except Exception as e:
-            return f"Error generating summary: {e!s}"
-
-    def _extract_summary_text(self, response: Any) -> str:
-        # Prefer .text which normalizes list content blocks (e.g. [{"type": "text", "text": "..."}]).
-        # Fall back to .content for non-LangChain responses, with explicit list handling
-        # to avoid producing Python repr strings like "[{'type': 'text', ...}]".
-        summary_text = getattr(response, "text", None)
-        if summary_text is None:
-            summary_text = getattr(response, "content", "")
-        if isinstance(summary_text, list):
-            parts: list[str] = []
-            for block in summary_text:
-                if isinstance(block, str):
-                    parts.append(block)
-                elif isinstance(block, dict) and block.get("type") == "text":
-                    parts.append(block.get("text", ""))
-            summary_text = "".join(parts)
-        return summary_text.strip() if isinstance(summary_text, str) else str(summary_text).strip()
-
     @override
     def _build_new_messages(self, summary: str) -> list[HumanMessage]:
         """Override the base implementation to let the human message with the special name 'summary'.
         And this message will be ignored to display in the frontend, but still can be used as context for the model.
         """
-        return [
+        return [HumanMessage(content=f"Here is a summary of the conversation to date:\n\n{summary}", name="summary")]
-            HumanMessage(
-                content=f"Here is a summary of the conversation to date:\n\n{summary}",
-                name="summary",
-                additional_kwargs={"hide_from_ui": True},
-            )
-        ]
 
     def _preserve_dynamic_context_reminders(
         self,

backend/packages/harness/deerflow/agents/middlewares/title_middleware.py

@@ -160,7 +160,11 @@ class TitleMiddleware(AgentMiddleware[TitleMiddlewareState]):
         prompt, user_msg = self._build_title_prompt(state)
 
         try:
-            model_kwargs = {"thinking_enabled": False}
+            # attach_tracing=False because ``_get_runnable_config()`` inherits
+            # the graph-level RunnableConfig (set in ``_make_lead_agent``) whose
+            # callbacks already carry tracing handlers; binding them again at
+            # the model level would emit duplicate spans.
+            model_kwargs = {"thinking_enabled": False, "attach_tracing": False}
             if self._app_config is not None:
                 model_kwargs["app_config"] = self._app_config
             if config.model_name:

backend/packages/harness/deerflow/agents/middlewares/todo_middleware.py

@@ -20,11 +20,13 @@ from collections.abc import Awaitable, Callable
 from typing import Any, override
 
 from langchain.agents.middleware import TodoListMiddleware
-from langchain.agents.middleware.todo import PlanningState, Todo
+from langchain.agents.middleware.todo import Todo
 from langchain.agents.middleware.types import ModelCallResult, ModelRequest, ModelResponse, hook_config
 from langchain_core.messages import AIMessage, HumanMessage
 from langgraph.runtime import Runtime
 
+from deerflow.agents.thread_state import ThreadState
+
 
 def _todos_in_messages(messages: list[Any]) -> bool:
     """Return True if any AIMessage in *messages* contains a write_todos tool call."""
@@ -113,10 +115,12 @@ class TodoMiddleware(TodoListMiddleware):
     and injects a reminder message so the model can continue tracking progress.
     """
 
+    state_schema = ThreadState
+
     @override
     def before_model(
         self,
-        state: PlanningState,
+        state: ThreadState,
         runtime: Runtime,
     ) -> dict[str, Any] | None:
         """Inject a todo-list reminder when write_todos has left the context window."""
@@ -154,7 +158,7 @@ class TodoMiddleware(TodoListMiddleware):
     @override
     async def abefore_model(
         self,
-        state: PlanningState,
+        state: ThreadState,
         runtime: Runtime,
     ) -> dict[str, Any] | None:
         """Async version of before_model."""
@@ -249,12 +253,12 @@ class TodoMiddleware(TodoListMiddleware):
             self._drop_completion_reminder_key_locked(key)
 
     @override
-    def before_agent(self, state: PlanningState, runtime: Runtime) -> dict[str, Any] | None:
+    def before_agent(self, state: ThreadState, runtime: Runtime) -> dict[str, Any] | None:
         self._clear_other_run_completion_reminders(runtime)
         return None
 
     @override
-    async def abefore_agent(self, state: PlanningState, runtime: Runtime) -> dict[str, Any] | None:
+    async def abefore_agent(self, state: ThreadState, runtime: Runtime) -> dict[str, Any] | None:
         self._clear_other_run_completion_reminders(runtime)
         return None
 
@@ -262,7 +266,7 @@ class TodoMiddleware(TodoListMiddleware):
     @override
     def after_model(
         self,
-        state: PlanningState,
+        state: ThreadState,
         runtime: Runtime,
     ) -> dict[str, Any] | None:
         """Prevent premature agent exit when todo items are still incomplete.
@@ -308,7 +312,7 @@ class TodoMiddleware(TodoListMiddleware):
     @hook_config(can_jump_to=["model"])
     async def aafter_model(
         self,
-        state: PlanningState,
+        state: ThreadState,
         runtime: Runtime,
     ) -> dict[str, Any] | None:
         """Async version of after_model."""
@@ -349,11 +353,11 @@ class TodoMiddleware(TodoListMiddleware):
         return await handler(self._augment_request(request))
 
     @override
-    def after_agent(self, state: PlanningState, runtime: Runtime) -> dict[str, Any] | None:
+    def after_agent(self, state: ThreadState, runtime: Runtime) -> dict[str, Any] | None:
         self._clear_current_run_completion_reminders(runtime)
         return None
 
     @override
-    async def aafter_agent(self, state: PlanningState, runtime: Runtime) -> dict[str, Any] | None:
+    async def aafter_agent(self, state: ThreadState, runtime: Runtime) -> dict[str, Any] | None:
         self._clear_current_run_completion_reminders(runtime)
         return None

backend/packages/harness/deerflow/agents/middlewares/tool_error_handling_middleware.py

@@ -77,9 +77,11 @@ def _build_runtime_middlewares(
     """Build shared base middlewares for agent execution."""
     from deerflow.agents.middlewares.llm_error_handling_middleware import LLMErrorHandlingMiddleware
     from deerflow.agents.middlewares.thread_data_middleware import ThreadDataMiddleware
+    from deerflow.agents.middlewares.tool_output_budget_middleware import ToolOutputBudgetMiddleware
     from deerflow.sandbox.middleware import SandboxMiddleware
 
     middlewares: list[AgentMiddleware] = [
+        ToolOutputBudgetMiddleware.from_app_config(app_config),
         ThreadDataMiddleware(lazy_init=lazy_init),
         SandboxMiddleware(lazy_init=lazy_init),
     ]
@@ -87,7 +89,7 @@ def _build_runtime_middlewares(
     if include_uploads:
         from deerflow.agents.middlewares.uploads_middleware import UploadsMiddleware
 
-        middlewares.insert(1, UploadsMiddleware())
+        middlewares.insert(2, UploadsMiddleware())
 
     if include_dangling_tool_call_patch:
         from deerflow.agents.middlewares.dangling_tool_call_middleware import DanglingToolCallMiddleware
@@ -164,4 +166,14 @@ def build_subagent_runtime_middlewares(
 
         middlewares.append(ViewImageMiddleware())
 
+    # Same provider safety-termination guard the lead agent uses — subagents
+    # are equally exposed to truncated tool_calls returned with
+    # finish_reason=content_filter (and friends), and the bad call would then
+    # propagate back to the lead agent via the task tool result.
+    safety_config = app_config.safety_finish_reason
+    if safety_config.enabled:
+        from deerflow.agents.middlewares.safety_finish_reason_middleware import SafetyFinishReasonMiddleware
+
+        middlewares.append(SafetyFinishReasonMiddleware.from_config(safety_config))
+
     return middlewares

backend/packages/harness/deerflow/agents/middlewares/tool_output_budget_middleware.py

@@ -0,0 +1,489 @@
+"""Middleware that enforces a per-result budget on tool outputs.
+
+Oversized tool results are persisted to disk and replaced with a compact
+preview containing a file reference.  When disk persistence is
+unavailable the middleware falls back to head+tail truncation so the
+model context is never blown by a single large tool return.
+"""
+
+from __future__ import annotations
+
+import asyncio
+import logging
+import os
+import uuid
+from collections.abc import Awaitable, Callable
+from dataclasses import replace as dc_replace
+from typing import Any, override
+
+from langchain.agents import AgentState
+from langchain.agents.middleware import AgentMiddleware
+from langchain.agents.middleware.types import ModelCallResult, ModelRequest, ModelResponse
+from langchain_core.messages import ToolMessage
+from langgraph.prebuilt.tool_node import ToolCallRequest
+from langgraph.types import Command
+
+from deerflow.config.tool_output_config import ToolOutputConfig
+
+logger = logging.getLogger(__name__)
+
+
+def _default_config() -> ToolOutputConfig:
+    return ToolOutputConfig()
+
+
+# ---------------------------------------------------------------------------
+# Text helpers
+# ---------------------------------------------------------------------------
+
+
+def _message_text(content: Any) -> str | None:
+    """Extract a plain-text representation from a ToolMessage content field.
+
+    Returns ``None`` for non-string / multimodal content so the caller
+    can skip budget enforcement (images, structured blocks, etc.).
+    """
+    if isinstance(content, str):
+        return content
+    if content is None:
+        return None
+    if isinstance(content, list):
+        pieces: list[str] = []
+        for part in content:
+            if isinstance(part, str):
+                pieces.append(part)
+            elif isinstance(part, dict) and isinstance(part.get("text"), str):
+                pieces.append(part["text"])
+            else:
+                return None
+        return "\n".join(pieces) if pieces else None
+    return None
+
+
+def _snap_to_line_boundary(text: str, pos: int) -> int:
+    """Return *pos* or the nearest preceding newline+1, whichever is closer.
+
+    Used so that previews and truncations end on a complete line when
+    possible.  If no newline exists in the second half of ``text[:pos]``
+    the original *pos* is returned unchanged.
+    """
+    if pos <= 0 or pos >= len(text):
+        return pos
+    half = pos // 2
+    nl = text.rfind("\n", half, pos)
+    if nl >= 0:
+        return nl + 1
+    return pos
+
+
+# ---------------------------------------------------------------------------
+# Disk persistence
+# ---------------------------------------------------------------------------
+
+_EXT_MAP: dict[str, str] = {
+    "bash": "log",
+    "bash_tool": "log",
+    "web_fetch": "log",
+}
+
+
+def _sanitize_tool_name(name: str) -> str:
+    """Strip path separators and traversal components from a tool name."""
+    base = os.path.basename(name)
+    safe = base.replace("..", "").replace("/", "_").replace("\\", "_")
+    return safe or "unknown"
+
+
+def _externalize(
+    content: str,
+    *,
+    tool_name: str,
+    tool_call_id: str,
+    outputs_path: str,
+    storage_subdir: str,
+) -> str | None:
+    """Write *content* to disk and return the virtual path, or ``None`` on failure."""
+    if os.path.isabs(storage_subdir) or ".." in storage_subdir:
+        return None
+    storage_dir = os.path.join(outputs_path, storage_subdir)
+    try:
+        os.makedirs(storage_dir, exist_ok=True)
+    except OSError:
+        return None
+
+    safe_name = _sanitize_tool_name(tool_name)
+    ext = _EXT_MAP.get(tool_name, "txt")
+    short_id = uuid.uuid4().hex[:12]
+    filename = f"{safe_name}-{short_id}.{ext}"
+    filepath = os.path.join(storage_dir, filename)
+
+    if not os.path.abspath(filepath).startswith(os.path.abspath(storage_dir)):
+        return None
+
+    try:
+        with open(filepath, "w", encoding="utf-8") as f:
+            f.write(content)
+    except OSError:
+        return None
+
+    virtual_base = "/mnt/user-data/outputs"
+    return f"{virtual_base}/{storage_subdir}/{filename}"
+
+
+# ---------------------------------------------------------------------------
+# Preview / fallback builders
+# ---------------------------------------------------------------------------
+
+
+def _build_preview(
+    content: str,
+    *,
+    tool_name: str,
+    virtual_path: str,
+    head_chars: int,
+    tail_chars: int,
+) -> str:
+    """Build a preview with a file reference for externalized output."""
+    total = len(content)
+    head_end = _snap_to_line_boundary(content, min(head_chars, total))
+    tail_start = max(head_end, total - tail_chars)
+    tail_start_snapped = _snap_to_line_boundary(content, tail_start)
+    if tail_start_snapped > head_end:
+        tail_start = tail_start_snapped
+
+    head = content[:head_end]
+    tail = content[tail_start:] if tail_start < total else ""
+
+    omitted = total - len(head) - len(tail)
+    ref = f"\n\n[Full {tool_name} output saved to {virtual_path} ({total} chars, ~{total // 4} tokens). Use read_file with start_line and end_line to access specific sections. {omitted} chars omitted from this preview.]\n\n"
+
+    parts = [head, ref]
+    if tail:
+        parts.append(tail)
+    return "".join(parts)
+
+
+def _build_fallback(
+    content: str,
+    *,
+    tool_name: str,
+    max_chars: int,
+    head_chars: int,
+    tail_chars: int,
+) -> str:
+    """Build a head+tail truncation when disk persistence is unavailable.
+
+    The returned string is guaranteed to be no longer than *max_chars*.
+    """
+    total = len(content)
+    if max_chars <= 0 or total <= max_chars:
+        return content
+
+    marker_template = "\n\n[... {n} chars omitted from {tn} output. Persistent storage unavailable. Consider narrowing the query or using more specific parameters.]\n\n"
+    marker_overhead = len(marker_template.format(n=total, tn=tool_name))
+
+    if marker_overhead >= max_chars:
+        return content[:max_chars]
+
+    budget = max_chars - marker_overhead
+    effective_head = min(head_chars, budget)
+    effective_tail = min(tail_chars, max(0, budget - effective_head))
+
+    head_end = _snap_to_line_boundary(content, min(effective_head, total))
+    tail_start = max(head_end, total - effective_tail)
+    tail_start_snapped = _snap_to_line_boundary(content, tail_start)
+    if tail_start_snapped > head_end:
+        tail_start = tail_start_snapped
+
+    head = content[:head_end]
+    tail = content[tail_start:] if tail_start < total else ""
+    omitted = total - len(head) - len(tail)
+
+    marker = marker_template.format(n=omitted, tn=tool_name)
+
+    parts = [head, marker]
+    if tail:
+        parts.append(tail)
+    return "".join(parts)
+
+
+# ---------------------------------------------------------------------------
+# Core budget logic
+# ---------------------------------------------------------------------------
+
+
+def _resolve_outputs_path(request: ToolCallRequest) -> str | None:
+    """Best-effort extraction of the thread outputs path."""
+    runtime = getattr(request, "runtime", None)
+    if runtime is None:
+        return None
+    state = getattr(runtime, "state", None)
+    if state is None:
+        return None
+    thread_data = state.get("thread_data")
+    if not isinstance(thread_data, dict):
+        return None
+    outputs_path = thread_data.get("outputs_path")
+    return outputs_path if isinstance(outputs_path, str) else None
+
+
+def _budget_content(
+    content: str,
+    *,
+    tool_name: str,
+    tool_call_id: str,
+    outputs_path: str | None,
+    config: ToolOutputConfig,
+) -> str | None:
+    """Apply budget to *content*. Returns ``None`` if no change needed."""
+    threshold = config.tool_overrides.get(tool_name, config.externalize_min_chars)
+    if threshold <= 0 and config.fallback_max_chars <= 0:
+        return None
+    if len(content) <= threshold and len(content) <= config.fallback_max_chars:
+        return None
+
+    if threshold > 0 and len(content) > threshold and outputs_path:
+        virtual_path = _externalize(
+            content,
+            tool_name=tool_name,
+            tool_call_id=tool_call_id,
+            outputs_path=outputs_path,
+            storage_subdir=config.storage_subdir,
+        )
+        if virtual_path is not None:
+            logger.info(
+                "Externalized %s output (%d chars) to %s",
+                tool_name,
+                len(content),
+                virtual_path,
+            )
+            return _build_preview(
+                content,
+                tool_name=tool_name,
+                virtual_path=virtual_path,
+                head_chars=config.preview_head_chars,
+                tail_chars=config.preview_tail_chars,
+            )
+
+    if config.fallback_max_chars > 0 and len(content) > config.fallback_max_chars:
+        logger.warning(
+            "Fallback-truncating %s output: %d chars → %d max",
+            tool_name,
+            len(content),
+            config.fallback_max_chars,
+        )
+        return _build_fallback(
+            content,
+            tool_name=tool_name,
+            max_chars=config.fallback_max_chars,
+            head_chars=config.fallback_head_chars,
+            tail_chars=config.fallback_tail_chars,
+        )
+
+    return None
+
+
+# ---------------------------------------------------------------------------
+# Result patchers
+# ---------------------------------------------------------------------------
+
+
+def _patch_tool_message(msg: ToolMessage, config: ToolOutputConfig, outputs_path: str | None) -> ToolMessage:
+    """Apply budget to a single ToolMessage. Returns the original if unchanged."""
+    tool_name = msg.name or "unknown"
+    if tool_name in config.exempt_tools:
+        return msg
+
+    text = _message_text(msg.content)
+    if text is None:
+        return msg
+
+    replacement = _budget_content(
+        text,
+        tool_name=tool_name,
+        tool_call_id=msg.tool_call_id or "",
+        outputs_path=outputs_path,
+        config=config,
+    )
+    if replacement is None:
+        return msg
+
+    update: dict[str, Any] = {"content": replacement}
+    if getattr(msg, "response_metadata", None):
+        update["response_metadata"] = dict(msg.response_metadata)
+    if getattr(msg, "additional_kwargs", None):
+        update["additional_kwargs"] = dict(msg.additional_kwargs)
+    return msg.model_copy(update=update)
+
+
+def _effective_trigger(tool_name: str, config: ToolOutputConfig) -> int:
+    """Smallest content length that could trigger budgeting for *tool_name*.
+
+    Mirrors the trigger conditions in :func:`_budget_content` (per-tool
+    externalize threshold OR global fallback), so the pre-scan never produces
+    a false negative. Returns ``-1`` when nothing could ever trigger.
+    """
+    candidates: list[int] = []
+    externalize = config.tool_overrides.get(tool_name, config.externalize_min_chars)
+    if externalize > 0:
+        candidates.append(externalize)
+    if config.fallback_max_chars > 0:
+        candidates.append(config.fallback_max_chars)
+    return min(candidates) if candidates else -1
+
+
+def _tool_message_over_budget(msg: ToolMessage, config: ToolOutputConfig) -> bool:
+    """Cheap, per-tool-aware check: is this ToolMessage non-exempt and over its trigger?"""
+    if (msg.name or "") in config.exempt_tools:
+        return False
+    trigger = _effective_trigger(msg.name or "", config)
+    if trigger < 0:
+        return False
+    text = _message_text(msg.content)
+    return text is not None and len(text) > trigger
+
+
+def _needs_budget(result: ToolMessage | Command, config: ToolOutputConfig) -> bool:
+    """Fast check whether *result* could need budgeting (avoids thread offload for small outputs)."""
+    if isinstance(result, ToolMessage):
+        return _tool_message_over_budget(result, config)
+    update = getattr(result, "update", None)
+    if isinstance(update, dict):
+        for msg in update.get("messages", []):
+            if isinstance(msg, ToolMessage) and _tool_message_over_budget(msg, config):
+                return True
+    return False
+
+
+def _patch_result(result: ToolMessage | Command, config: ToolOutputConfig, outputs_path: str | None) -> ToolMessage | Command:
+    """Apply budget to a tool call result (ToolMessage or Command)."""
+    if isinstance(result, ToolMessage):
+        return _patch_tool_message(result, config, outputs_path)
+
+    update = getattr(result, "update", None)
+    if not isinstance(update, dict):
+        return result
+
+    messages = update.get("messages")
+    if not isinstance(messages, list):
+        return result
+
+    new_messages: list[Any] = []
+    changed = False
+    for msg in messages:
+        if isinstance(msg, ToolMessage):
+            patched = _patch_tool_message(msg, config, outputs_path)
+            if patched is not msg:
+                changed = True
+            new_messages.append(patched)
+        else:
+            new_messages.append(msg)
+
+    if not changed:
+        return result
+
+    return dc_replace(result, update={**update, "messages": new_messages})
+
+
+def _patch_model_messages(messages: list[Any], config: ToolOutputConfig) -> list[Any] | None:
+    """Apply budget to historical ToolMessages in a model request. Returns ``None`` if unchanged.
+
+    A cheap pre-scan bails out before allocating a new list when no historical
+    ToolMessage exceeds the budget — the common case once every result has
+    already been budgeted at tool-call time, so a long history is not rebuilt
+    on every model call.
+    """
+    if not any(isinstance(msg, ToolMessage) and _tool_message_over_budget(msg, config) for msg in messages):
+        return None
+
+    updated: list[Any] = []
+    changed = False
+    for msg in messages:
+        if isinstance(msg, ToolMessage):
+            patched = _patch_tool_message(msg, config, outputs_path=None)
+            if patched is not msg:
+                changed = True
+            updated.append(patched)
+        else:
+            updated.append(msg)
+    return updated if changed else None
+
+
+# ---------------------------------------------------------------------------
+# Middleware class
+# ---------------------------------------------------------------------------
+
+
+class ToolOutputBudgetMiddleware(AgentMiddleware[AgentState]):
+    """Enforce per-result budget on tool outputs via externalization or truncation."""
+
+    def __init__(self, config: ToolOutputConfig | None = None) -> None:
+        super().__init__()
+        self._config = config if config is not None else _default_config()
+
+    @classmethod
+    def from_app_config(cls, app_config: Any) -> ToolOutputBudgetMiddleware:
+        tool_output = getattr(app_config, "tool_output", None)
+        if isinstance(tool_output, ToolOutputConfig):
+            return cls(config=tool_output)
+        return cls()
+
+    # -- tool call hooks ---------------------------------------------------
+
+    @override
+    def wrap_tool_call(
+        self,
+        request: ToolCallRequest,
+        handler: Callable[[ToolCallRequest], ToolMessage | Command],
+    ) -> ToolMessage | Command:
+        result = handler(request)
+        if not self._config.enabled:
+            return result
+        if not _needs_budget(result, self._config):
+            return result
+        outputs_path = _resolve_outputs_path(request)
+        return _patch_result(result, self._config, outputs_path)
+
+    @override
+    async def awrap_tool_call(
+        self,
+        request: ToolCallRequest,
+        handler: Callable[[ToolCallRequest], Awaitable[ToolMessage | Command]],
+    ) -> ToolMessage | Command:
+        result = await handler(request)
+        if not self._config.enabled:
+            return result
+        if not _needs_budget(result, self._config):
+            return result
+        outputs_path = _resolve_outputs_path(request)
+        return await asyncio.to_thread(_patch_result, result, self._config, outputs_path)
+
+    # -- model call hooks (historical message truncation) ------------------
+
+    @override
+    def wrap_model_call(
+        self,
+        request: ModelRequest,
+        handler: Callable[[ModelRequest], ModelResponse],
+    ) -> ModelCallResult:
+        if self._config.enabled:
+            messages = getattr(request, "messages", None)
+            if isinstance(messages, list):
+                patched = _patch_model_messages(messages, self._config)
+                if patched is not None:
+                    request = request.override(messages=patched)
+        return handler(request)
+
+    @override
+    async def awrap_model_call(
+        self,
+        request: ModelRequest,
+        handler: Callable[[ModelRequest], Awaitable[ModelResponse]],
+    ) -> ModelCallResult:
+        if self._config.enabled:
+            messages = getattr(request, "messages", None)
+            if isinstance(messages, list):
+                patched = _patch_model_messages(messages, self._config)
+                if patched is not None:
+                    request = request.override(messages=patched)
+        return await handler(request)

backend/packages/harness/deerflow/agents/middlewares/uploads_middleware.py

@@ -7,6 +7,7 @@ from typing import NotRequired, override
 from langchain.agents import AgentState
 from langchain.agents.middleware import AgentMiddleware
 from langchain_core.messages import HumanMessage
+from langchain_core.runnables import run_in_executor
 from langgraph.runtime import Runtime
 
 from deerflow.config.paths import Paths, get_paths
@@ -293,3 +294,16 @@ class UploadsMiddleware(AgentMiddleware[UploadsMiddlewareState]):
             "uploaded_files": new_files,
             "messages": messages,
         }
+
+    @override
+    async def abefore_agent(self, state: UploadsMiddlewareState, runtime: Runtime) -> dict | None:
+        """Async hook that offloads the synchronous uploads scan off the event loop.
+
+        ``before_agent`` performs blocking filesystem IO (directory enumeration,
+        ``stat``, reading sibling ``.md`` outlines). When the graph runs async,
+        langgraph would otherwise execute the sync hook directly on the event
+        loop, so it is dispatched to a worker thread via ``run_in_executor``.
+        ``run_in_executor`` copies the current context, so the ``user_id``
+        contextvar read by ``get_effective_user_id()`` is preserved.
+        """
+        return await run_in_executor(None, self.before_agent, state, runtime)

backend/packages/harness/deerflow/agents/thread_state.py

@@ -45,11 +45,24 @@ def merge_viewed_images(existing: dict[str, ViewedImageData] | None, new: dict[s
     return {**existing, **new}
 
 
+def merge_todos(existing: list | None, new: list | None) -> list | None:
+    """Reducer for todos list - keeps the last non-None value.
+
+    Semantics:
+    - If `new` is None (node didn't touch todos), preserve `existing`.
+    - If `new` is provided (even empty list), it represents an explicit
+      update and wins over `existing`.
+    """
+    if new is None:
+        return existing
+    return new
+
+
 class ThreadState(AgentState):
     sandbox: NotRequired[SandboxState | None]
     thread_data: NotRequired[ThreadDataState | None]
     title: NotRequired[str | None]
     artifacts: Annotated[list[str], merge_artifacts]
-    todos: NotRequired[list | None]
+    todos: Annotated[list | None, merge_todos]
     uploaded_files: NotRequired[list[dict] | None]
     viewed_images: Annotated[dict[str, ViewedImageData], merge_viewed_images]  # image_path -> {base64, mime_type}

backend/packages/harness/deerflow/client.py

@@ -19,6 +19,7 @@ import asyncio
 import json
 import logging
 import mimetypes
+import os
 import shutil
 import tempfile
 import uuid
@@ -42,6 +43,7 @@ from deerflow.config.paths import get_paths
 from deerflow.models import create_chat_model
 from deerflow.runtime.user_context import get_effective_user_id
 from deerflow.skills.storage import get_or_new_skill_storage
+from deerflow.tracing import build_tracing_callbacks, inject_langfuse_metadata
 from deerflow.uploads.manager import (
     claim_unique_filename,
     delete_file_safe,
@@ -123,6 +125,7 @@ class DeerFlowClient:
         agent_name: str | None = None,
         available_skills: set[str] | None = None,
         middlewares: Sequence[AgentMiddleware] | None = None,
+        environment: str | None = None,
     ):
         """Initialize the client.
 
@@ -140,6 +143,12 @@ class DeerFlowClient:
             agent_name: Name of the agent to use.
             available_skills: Optional set of skill names to make available. If None (default), all scanned skills are available.
             middlewares: Optional list of custom middlewares to inject into the agent.
+            environment: Deployment environment label that ends up in
+                ``langfuse_tags`` (e.g. ``"production"`` / ``"staging"``).
+                When ``None`` the worker/client falls back to the
+                ``DEER_FLOW_ENV`` or ``ENVIRONMENT`` env vars. Pass an
+                explicit value for programmatic callers that do not want
+                env-var coupling.
         """
         if config_path is not None:
             reload_app_config(config_path)
@@ -156,6 +165,7 @@ class DeerFlowClient:
         self._agent_name = agent_name
         self._available_skills = set(available_skills) if available_skills is not None else None
         self._middlewares = list(middlewares) if middlewares else []
+        self._environment = environment
 
         # Lazy agent — created on first call, recreated when config changes.
         self._agent = None
@@ -228,7 +238,11 @@ class DeerFlowClient:
         max_concurrent_subagents = cfg.get("max_concurrent_subagents", 3)
 
         kwargs: dict[str, Any] = {
-            "model": create_chat_model(name=model_name, thinking_enabled=thinking_enabled),
+            # attach_tracing=False because ``stream()`` injects tracing
+            # callbacks at the graph invocation root so a single embedded run
+            # produces one trace with correct session_id / user_id propagation.
+            # Attaching them again on the model would emit duplicate spans.
+            "model": create_chat_model(name=model_name, thinking_enabled=thinking_enabled, attach_tracing=False),
             "tools": self._get_tools(model_name=model_name, subagent_enabled=subagent_enabled),
             "middleware": _build_middlewares(config, model_name=model_name, agent_name=self._agent_name, custom_middlewares=self._middlewares),
             "system_prompt": apply_prompt_template(
@@ -571,6 +585,28 @@ class DeerFlowClient:
             thread_id = str(uuid.uuid4())
 
         config = self._get_runnable_config(thread_id, **kwargs)
+
+        # Inject tracing callbacks and Langfuse trace metadata at the graph
+        # invocation root so the embedded client matches the gateway worker's
+        # behaviour: a single ``stream()`` produces one trace with all node /
+        # LLM / tool calls nested under it, and the trace carries the reserved
+        # ``langfuse_session_id`` / ``langfuse_user_id`` keys that the Langfuse
+        # CallbackHandler lifts onto the root trace's ``sessionId`` / ``userId``.
+        tracing_callbacks = build_tracing_callbacks()
+        if tracing_callbacks:
+            existing_callbacks = list(config.get("callbacks") or [])
+            config["callbacks"] = [*existing_callbacks, *tracing_callbacks]
+
+        configurable = config.get("configurable") or {}
+        inject_langfuse_metadata(
+            config,
+            thread_id=thread_id,
+            user_id=get_effective_user_id(),
+            assistant_id=self._agent_name or "lead-agent",
+            model_name=configurable.get("model_name") or self._model_name,
+            environment=self._environment or os.environ.get("DEER_FLOW_ENV") or os.environ.get("ENVIRONMENT"),
+        )
+
         self._ensure_agent(config)
 
         state: dict[str, Any] = {"messages": [HumanMessage(content=message)]}

backend/packages/harness/deerflow/community/aio_sandbox/aio_sandbox.py

@@ -1,4 +1,5 @@
 import base64
+import errno
 import logging
 import shlex
 import threading
@@ -6,11 +7,14 @@ import uuid
 
 from agent_sandbox import Sandbox as AioSandboxClient
 
+from deerflow.config.paths import VIRTUAL_PATH_PREFIX
 from deerflow.sandbox.sandbox import Sandbox
 from deerflow.sandbox.search import GrepMatch, path_matches, should_ignore_path, truncate_line
 
 logger = logging.getLogger(__name__)
 
+_MAX_DOWNLOAD_SIZE = 100 * 1024 * 1024  # 100 MB
+
 _ERROR_OBSERVATION_SIGNATURE = "'ErrorObservation' object has no attribute 'exit_code'"
 
 
@@ -102,6 +106,49 @@ class AioSandbox(Sandbox):
             logger.error(f"Failed to read file in sandbox: {e}")
             return f"Error: {e}"
 
+    def download_file(self, path: str) -> bytes:
+        """Download file bytes from the sandbox.
+
+        Raises:
+            PermissionError: If the path contains '..' traversal segments or is
+                outside ``VIRTUAL_PATH_PREFIX``.
+            OSError: If the file cannot be retrieved from the sandbox.
+        """
+        # Reject path traversal before sending to the container API.
+        # LocalSandbox gets this implicitly via _resolve_path;
+        # here the path is forwarded verbatim so we must check explicitly.
+        normalised = path.replace("\\", "/")
+        for segment in normalised.split("/"):
+            if segment == "..":
+                logger.error(f"Refused download due to path traversal: {path}")
+                raise PermissionError(f"Access denied: path traversal detected in '{path}'")
+
+        stripped_path = normalised.lstrip("/")
+        allowed_prefix = VIRTUAL_PATH_PREFIX.lstrip("/")
+        if stripped_path != allowed_prefix and not stripped_path.startswith(f"{allowed_prefix}/"):
+            logger.error("Refused download outside allowed directory: path=%s, allowed_prefix=%s", path, VIRTUAL_PATH_PREFIX)
+            raise PermissionError(f"Access denied: path must be under '{VIRTUAL_PATH_PREFIX}': '{path}'")
+
+        with self._lock:
+            try:
+                chunks: list[bytes] = []
+                total = 0
+                for chunk in self._client.file.download_file(path=path):
+                    total += len(chunk)
+                    if total > _MAX_DOWNLOAD_SIZE:
+                        raise OSError(
+                            errno.EFBIG,
+                            f"File exceeds maximum download size of {_MAX_DOWNLOAD_SIZE} bytes",
+                            path,
+                        )
+                    chunks.append(chunk)
+                return b"".join(chunks)
+            except OSError:
+                raise
+            except Exception as e:
+                logger.error(f"Failed to download file in sandbox: {e}")
+                raise OSError(f"Failed to download file '{path}' from sandbox: {e}") from e
+
     def list_dir(self, path: str, max_depth: int = 2) -> list[str]:
         """List the contents of a directory in the sandbox.
 

backend/packages/harness/deerflow/community/aio_sandbox/aio_sandbox_provider.py

@@ -10,6 +10,7 @@ The provider itself handles:
 - Mount computation (thread-specific, skills)
 """
 
+import asyncio
 import atexit
 import hashlib
 import logging
@@ -18,6 +19,7 @@ import signal
 import threading
 import time
 import uuid
+from concurrent.futures import ThreadPoolExecutor
 
 try:
     import fcntl
@@ -32,7 +34,7 @@ from deerflow.sandbox.sandbox import Sandbox
 from deerflow.sandbox.sandbox_provider import SandboxProvider
 
 from .aio_sandbox import AioSandbox
-from .backend import SandboxBackend, wait_for_sandbox_ready
+from .backend import SandboxBackend, wait_for_sandbox_ready, wait_for_sandbox_ready_async
 from .local_backend import LocalContainerBackend
 from .remote_backend import RemoteSandboxBackend
 from .sandbox_info import SandboxInfo
@@ -46,6 +48,9 @@ DEFAULT_CONTAINER_PREFIX = "deer-flow-sandbox"
 DEFAULT_IDLE_TIMEOUT = 600  # 10 minutes in seconds
 DEFAULT_REPLICAS = 3  # Maximum concurrent sandbox containers
 IDLE_CHECK_INTERVAL = 60  # Check every 60 seconds
+THREAD_LOCK_EXECUTOR_WORKERS = min(32, (os.cpu_count() or 1) + 4)
+_THREAD_LOCK_EXECUTOR = ThreadPoolExecutor(max_workers=THREAD_LOCK_EXECUTOR_WORKERS, thread_name_prefix="sandbox-lock-wait")
+atexit.register(_THREAD_LOCK_EXECUTOR.shutdown, wait=False, cancel_futures=True)
 
 
 def _lock_file_exclusive(lock_file) -> None:
@@ -66,6 +71,40 @@ def _unlock_file(lock_file) -> None:
     msvcrt.locking(lock_file.fileno(), msvcrt.LK_UNLCK, 1)
 
 
+def _open_lock_file(lock_path):
+    return open(lock_path, "a", encoding="utf-8")
+
+
+async def _acquire_thread_lock_async(lock: threading.Lock) -> None:
+    """Acquire a threading.Lock without polling or using the default executor."""
+    loop = asyncio.get_running_loop()
+    acquire_future = loop.run_in_executor(_THREAD_LOCK_EXECUTOR, lock.acquire, True)
+
+    try:
+        acquired = await asyncio.shield(acquire_future)
+    except asyncio.CancelledError:
+        acquire_future.add_done_callback(lambda task: _release_cancelled_lock_acquire(lock, task))
+        raise
+
+    if not acquired:
+        raise RuntimeError("Failed to acquire sandbox thread lock")
+
+
+def _release_cancelled_lock_acquire(lock: threading.Lock, task: asyncio.Future[bool]) -> None:
+    """Release a lock acquired after its awaiting coroutine was cancelled."""
+    if task.cancelled():
+        return
+
+    try:
+        acquired = task.result()
+    except Exception as e:
+        logger.warning(f"Cancelled sandbox lock acquisition finished with error: {e}")
+        return
+
+    if acquired:
+        lock.release()
+
+
 class AioSandboxProvider(SandboxProvider):
     """Sandbox provider that manages containers running the AIO sandbox.
 
@@ -416,6 +455,96 @@ class AioSandboxProvider(SandboxProvider):
                 self._thread_locks[thread_id] = threading.Lock()
             return self._thread_locks[thread_id]
 
+    def _sandbox_id_for_thread(self, thread_id: str | None) -> str:
+        """Return deterministic IDs for thread sandboxes and random IDs otherwise."""
+        return self._deterministic_sandbox_id(thread_id) if thread_id else str(uuid.uuid4())[:8]
+
+    def _reuse_in_process_sandbox(self, thread_id: str | None, *, post_lock: bool = False) -> str | None:
+        """Reuse an active in-process sandbox for a thread if one is still tracked."""
+        if thread_id is None:
+            return None
+
+        with self._lock:
+            if thread_id not in self._thread_sandboxes:
+                return None
+
+            existing_id = self._thread_sandboxes[thread_id]
+            if existing_id in self._sandboxes:
+                suffix = " (post-lock check)" if post_lock else ""
+                logger.info(f"Reusing in-process sandbox {existing_id} for thread {thread_id}{suffix}")
+                self._last_activity[existing_id] = time.time()
+                return existing_id
+
+            del self._thread_sandboxes[thread_id]
+            return None
+
+    def _reclaim_warm_pool_sandbox(self, thread_id: str | None, sandbox_id: str, *, post_lock: bool = False) -> str | None:
+        """Promote a warm-pool sandbox back to active tracking if available."""
+        if thread_id is None:
+            return None
+
+        with self._lock:
+            if sandbox_id not in self._warm_pool:
+                return None
+
+            info, _ = self._warm_pool.pop(sandbox_id)
+            sandbox = AioSandbox(id=sandbox_id, base_url=info.sandbox_url)
+            self._sandboxes[sandbox_id] = sandbox
+            self._sandbox_infos[sandbox_id] = info
+            self._last_activity[sandbox_id] = time.time()
+            self._thread_sandboxes[thread_id] = sandbox_id
+
+        suffix = " (post-lock check)" if post_lock else f" at {info.sandbox_url}"
+        logger.info(f"Reclaimed warm-pool sandbox {sandbox_id} for thread {thread_id}{suffix}")
+        return sandbox_id
+
+    def _recheck_cached_sandbox(self, thread_id: str, sandbox_id: str) -> str | None:
+        """Re-check in-memory caches after acquiring the cross-process file lock."""
+        return self._reuse_in_process_sandbox(thread_id, post_lock=True) or self._reclaim_warm_pool_sandbox(thread_id, sandbox_id, post_lock=True)
+
+    def _register_discovered_sandbox(self, thread_id: str, info: SandboxInfo) -> str:
+        """Track a sandbox discovered through the backend."""
+        sandbox = AioSandbox(id=info.sandbox_id, base_url=info.sandbox_url)
+        with self._lock:
+            self._sandboxes[info.sandbox_id] = sandbox
+            self._sandbox_infos[info.sandbox_id] = info
+            self._last_activity[info.sandbox_id] = time.time()
+            self._thread_sandboxes[thread_id] = info.sandbox_id
+
+        logger.info(f"Discovered existing sandbox {info.sandbox_id} for thread {thread_id} at {info.sandbox_url}")
+        return info.sandbox_id
+
+    def _register_created_sandbox(self, thread_id: str | None, sandbox_id: str, info: SandboxInfo) -> str:
+        """Track a newly-created sandbox in the active maps."""
+        sandbox = AioSandbox(id=sandbox_id, base_url=info.sandbox_url)
+        with self._lock:
+            self._sandboxes[sandbox_id] = sandbox
+            self._sandbox_infos[sandbox_id] = info
+            self._last_activity[sandbox_id] = time.time()
+            if thread_id:
+                self._thread_sandboxes[thread_id] = sandbox_id
+
+        logger.info(f"Created sandbox {sandbox_id} for thread {thread_id} at {info.sandbox_url}")
+        return sandbox_id
+
+    def _replica_count(self) -> tuple[int, int]:
+        """Return configured replicas and currently tracked sandbox count."""
+        replicas = self._config.get("replicas", DEFAULT_REPLICAS)
+        with self._lock:
+            total = len(self._sandboxes) + len(self._warm_pool)
+        return replicas, total
+
+    def _log_replicas_soft_cap(self, replicas: int, sandbox_id: str, evicted: str | None) -> None:
+        """Log the result of enforcing the warm-pool replica budget."""
+        if evicted:
+            logger.info(f"Evicted warm-pool sandbox {evicted} to stay within replicas={replicas}")
+            return
+
+        # All slots are occupied by active sandboxes — proceed anyway and log.
+        # The replicas limit is a soft cap; we never forcibly stop a container
+        # that is actively serving a thread.
+        logger.warning(f"All {replicas} replica slots are in active use; creating sandbox {sandbox_id} beyond the soft limit")
+
     # ── Core: acquire / get / release / shutdown ─────────────────────────
 
     def acquire(self, thread_id: str | None = None) -> str:
@@ -440,6 +569,23 @@ class AioSandboxProvider(SandboxProvider):
         else:
             return self._acquire_internal(thread_id)
 
+    async def acquire_async(self, thread_id: str | None = None) -> str:
+        """Acquire a sandbox environment without blocking the event loop.
+
+        Mirrors ``acquire()`` while keeping blocking backend operations off the
+        event loop and using async-native readiness polling for newly created
+        sandboxes.
+        """
+        if thread_id:
+            thread_lock = self._get_thread_lock(thread_id)
+            await _acquire_thread_lock_async(thread_lock)
+            try:
+                return await self._acquire_internal_async(thread_id)
+            finally:
+                thread_lock.release()
+
+        return await self._acquire_internal_async(thread_id)
+
     def _acquire_internal(self, thread_id: str | None) -> str:
         """Internal sandbox acquisition with two-layer consistency.
 
@@ -448,33 +594,17 @@ class AioSandboxProvider(SandboxProvider):
                  sandbox_id is deterministic from thread_id so no shared state file
                  is needed — any process can derive the same container name)
         """
-        # ── Layer 1: In-process cache (fast path) ──
+        cached_id = self._reuse_in_process_sandbox(thread_id)
-        if thread_id:
+        if cached_id is not None:
-            with self._lock:
+            return cached_id
-                if thread_id in self._thread_sandboxes:
-                    existing_id = self._thread_sandboxes[thread_id]
-                    if existing_id in self._sandboxes:
-                        logger.info(f"Reusing in-process sandbox {existing_id} for thread {thread_id}")
-                        self._last_activity[existing_id] = time.time()
-                        return existing_id
-                    else:
-                        del self._thread_sandboxes[thread_id]
 
         # Deterministic ID for thread-specific, random for anonymous
-        sandbox_id = self._deterministic_sandbox_id(thread_id) if thread_id else str(uuid.uuid4())[:8]
+        sandbox_id = self._sandbox_id_for_thread(thread_id)
 
         # ── Layer 1.5: Warm pool (container still running, no cold-start) ──
-        if thread_id:
+        reclaimed_id = self._reclaim_warm_pool_sandbox(thread_id, sandbox_id)
-            with self._lock:
+        if reclaimed_id is not None:
-                if sandbox_id in self._warm_pool:
+            return reclaimed_id
-                    info, _ = self._warm_pool.pop(sandbox_id)
-                    sandbox = AioSandbox(id=sandbox_id, base_url=info.sandbox_url)
-                    self._sandboxes[sandbox_id] = sandbox
-                    self._sandbox_infos[sandbox_id] = info
-                    self._last_activity[sandbox_id] = time.time()
-                    self._thread_sandboxes[thread_id] = sandbox_id
-                    logger.info(f"Reclaimed warm-pool sandbox {sandbox_id} for thread {thread_id} at {info.sandbox_url}")
-                    return sandbox_id
 
         # ── Layer 2: Backend discovery + create (protected by cross-process lock) ──
         # Use a file lock so that two processes racing to create the same sandbox
@@ -485,6 +615,26 @@ class AioSandboxProvider(SandboxProvider):
 
         return self._create_sandbox(thread_id, sandbox_id)
 
+    async def _acquire_internal_async(self, thread_id: str | None) -> str:
+        """Async counterpart to ``_acquire_internal``."""
+        cached_id = self._reuse_in_process_sandbox(thread_id)
+        if cached_id is not None:
+            return cached_id
+
+        # Deterministic ID for thread-specific, random for anonymous
+        sandbox_id = self._sandbox_id_for_thread(thread_id)
+
+        # ── Layer 1.5: Warm pool (container still running, no cold-start) ──
+        reclaimed_id = self._reclaim_warm_pool_sandbox(thread_id, sandbox_id)
+        if reclaimed_id is not None:
+            return reclaimed_id
+
+        # ── Layer 2: Backend discovery + create (protected by cross-process lock) ──
+        if thread_id:
+            return await self._discover_or_create_with_lock_async(thread_id, sandbox_id)
+
+        return await self._create_sandbox_async(thread_id, sandbox_id)
+
     def _discover_or_create_with_lock(self, thread_id: str, sandbox_id: str) -> str:
         """Discover an existing sandbox or create a new one under a cross-process file lock.
 
@@ -503,40 +653,50 @@ class AioSandboxProvider(SandboxProvider):
                 locked = True
                 # Re-check in-process caches under the file lock in case another
                 # thread in this process won the race while we were waiting.
-                with self._lock:
+                cached_id = self._recheck_cached_sandbox(thread_id, sandbox_id)
-                    if thread_id in self._thread_sandboxes:
+                if cached_id is not None:
-                        existing_id = self._thread_sandboxes[thread_id]
+                    return cached_id
-                        if existing_id in self._sandboxes:
-                            logger.info(f"Reusing in-process sandbox {existing_id} for thread {thread_id} (post-lock check)")
-                            self._last_activity[existing_id] = time.time()
-                            return existing_id
-                    if sandbox_id in self._warm_pool:
-                        info, _ = self._warm_pool.pop(sandbox_id)
-                        sandbox = AioSandbox(id=sandbox_id, base_url=info.sandbox_url)
-                        self._sandboxes[sandbox_id] = sandbox
-                        self._sandbox_infos[sandbox_id] = info
-                        self._last_activity[sandbox_id] = time.time()
-                        self._thread_sandboxes[thread_id] = sandbox_id
-                        logger.info(f"Reclaimed warm-pool sandbox {sandbox_id} for thread {thread_id} (post-lock check)")
-                        return sandbox_id
 
                 # Backend discovery: another process may have created the container.
                 discovered = self._backend.discover(sandbox_id)
                 if discovered is not None:
-                    sandbox = AioSandbox(id=discovered.sandbox_id, base_url=discovered.sandbox_url)
+                    return self._register_discovered_sandbox(thread_id, discovered)
-                    with self._lock:
-                        self._sandboxes[discovered.sandbox_id] = sandbox
-                        self._sandbox_infos[discovered.sandbox_id] = discovered
-                        self._last_activity[discovered.sandbox_id] = time.time()
-                        self._thread_sandboxes[thread_id] = discovered.sandbox_id
-                    logger.info(f"Discovered existing sandbox {discovered.sandbox_id} for thread {thread_id} at {discovered.sandbox_url}")
-                    return discovered.sandbox_id
 
                 return self._create_sandbox(thread_id, sandbox_id)
             finally:
                 if locked:
                     _unlock_file(lock_file)
 
+    async def _discover_or_create_with_lock_async(self, thread_id: str, sandbox_id: str) -> str:
+        """Async counterpart to ``_discover_or_create_with_lock``."""
+        paths = get_paths()
+        user_id = get_effective_user_id()
+        await asyncio.to_thread(paths.ensure_thread_dirs, thread_id, user_id=user_id)
+        lock_path = paths.thread_dir(thread_id, user_id=user_id) / f"{sandbox_id}.lock"
+
+        lock_file = await asyncio.to_thread(_open_lock_file, lock_path)
+        locked = False
+        try:
+            await asyncio.to_thread(_lock_file_exclusive, lock_file)
+            locked = True
+            # Re-check in-process caches under the file lock in case another
+            # thread in this process won the race while we were waiting.
+            cached_id = self._recheck_cached_sandbox(thread_id, sandbox_id)
+            if cached_id is not None:
+                return cached_id
+
+            # Backend discovery is sync because local discovery may inspect
+            # Docker and perform a health check; keep it off the event loop.
+            discovered = await asyncio.to_thread(self._backend.discover, sandbox_id)
+            if discovered is not None:
+                return self._register_discovered_sandbox(thread_id, discovered)
+
+            return await self._create_sandbox_async(thread_id, sandbox_id)
+        finally:
+            if locked:
+                await asyncio.to_thread(_unlock_file, lock_file)
+            await asyncio.to_thread(lock_file.close)
+
     def _evict_oldest_warm(self) -> str | None:
         """Destroy the oldest container in the warm pool to free capacity.
 
@@ -574,18 +734,10 @@ class AioSandboxProvider(SandboxProvider):
 
         # Enforce replicas: only warm-pool containers count toward eviction budget.
         # Active sandboxes are in use by live threads and must not be forcibly stopped.
-        replicas = self._config.get("replicas", DEFAULT_REPLICAS)
+        replicas, total = self._replica_count()
-        with self._lock:
-            total = len(self._sandboxes) + len(self._warm_pool)
         if total >= replicas:
             evicted = self._evict_oldest_warm()
-            if evicted:
+            self._log_replicas_soft_cap(replicas, sandbox_id, evicted)
-                logger.info(f"Evicted warm-pool sandbox {evicted} to stay within replicas={replicas}")
-            else:
-                # All slots are occupied by active sandboxes — proceed anyway and log.
-                # The replicas limit is a soft cap; we never forcibly stop a container
-                # that is actively serving a thread.
-                logger.warning(f"All {replicas} replica slots are in active use; creating sandbox {sandbox_id} beyond the soft limit")
 
         info = self._backend.create(thread_id, sandbox_id, extra_mounts=extra_mounts or None)
 
@@ -594,16 +746,27 @@ class AioSandboxProvider(SandboxProvider):
             self._backend.destroy(info)
             raise RuntimeError(f"Sandbox {sandbox_id} failed to become ready within timeout at {info.sandbox_url}")
 
-        sandbox = AioSandbox(id=sandbox_id, base_url=info.sandbox_url)
+        return self._register_created_sandbox(thread_id, sandbox_id, info)
-        with self._lock:
-            self._sandboxes[sandbox_id] = sandbox
-            self._sandbox_infos[sandbox_id] = info
-            self._last_activity[sandbox_id] = time.time()
-            if thread_id:
-                self._thread_sandboxes[thread_id] = sandbox_id
 
-        logger.info(f"Created sandbox {sandbox_id} for thread {thread_id} at {info.sandbox_url}")
+    async def _create_sandbox_async(self, thread_id: str | None, sandbox_id: str) -> str:
-        return sandbox_id
+        """Async counterpart to ``_create_sandbox``."""
+        extra_mounts = await asyncio.to_thread(self._get_extra_mounts, thread_id)
+
+        # Enforce replicas: only warm-pool containers count toward eviction budget.
+        # Active sandboxes are in use by live threads and must not be forcibly stopped.
+        replicas, total = self._replica_count()
+        if total >= replicas:
+            evicted = await asyncio.to_thread(self._evict_oldest_warm)
+            self._log_replicas_soft_cap(replicas, sandbox_id, evicted)
+
+        info = await asyncio.to_thread(self._backend.create, thread_id, sandbox_id, extra_mounts=extra_mounts or None)
+
+        # Wait for sandbox to be ready without blocking the event loop.
+        if not await wait_for_sandbox_ready_async(info.sandbox_url, timeout=60):
+            await asyncio.to_thread(self._backend.destroy, info)
+            raise RuntimeError(f"Sandbox {sandbox_id} failed to become ready within timeout at {info.sandbox_url}")
+
+        return self._register_created_sandbox(thread_id, sandbox_id, info)
 
     def get(self, sandbox_id: str) -> Sandbox | None:
         """Get a sandbox by ID. Updates last activity timestamp.

backend/packages/harness/deerflow/community/aio_sandbox/backend.py

@@ -2,10 +2,12 @@
 
 from __future__ import annotations
 
+import asyncio
 import logging
 import time
 from abc import ABC, abstractmethod
 
+import httpx
 import requests
 
 from .sandbox_info import SandboxInfo
@@ -35,6 +37,34 @@ def wait_for_sandbox_ready(sandbox_url: str, timeout: int = 30) -> bool:
     return False
 
 
+async def wait_for_sandbox_ready_async(sandbox_url: str, timeout: int = 30, poll_interval: float = 1.0) -> bool:
+    """Async variant of sandbox readiness polling.
+
+    Use this from async runtime paths so sandbox startup waits do not block the
+    event loop. The synchronous ``wait_for_sandbox_ready`` function remains for
+    existing synchronous backend/provider call sites.
+    """
+    loop = asyncio.get_running_loop()
+    deadline = loop.time() + timeout
+
+    async with httpx.AsyncClient(timeout=5) as client:
+        while True:
+            remaining = deadline - loop.time()
+            if remaining <= 0:
+                break
+            try:
+                response = await client.get(f"{sandbox_url}/v1/sandbox", timeout=min(5.0, remaining))
+                if response.status_code == 200:
+                    return True
+            except httpx.RequestError:
+                pass
+            remaining = deadline - loop.time()
+            if remaining <= 0:
+                break
+            await asyncio.sleep(min(poll_interval, remaining))
+    return False
+
+
 class SandboxBackend(ABC):
     """Abstract base for sandbox provisioning backends.
 
@@ -44,7 +74,7 @@ class SandboxBackend(ABC):
     """
 
     @abstractmethod
-    def create(self, thread_id: str, sandbox_id: str, extra_mounts: list[tuple[str, str, bool]] | None = None) -> SandboxInfo:
+    def create(self, thread_id: str | None, sandbox_id: str, extra_mounts: list[tuple[str, str, bool]] | None = None) -> SandboxInfo:
         """Create/provision a new sandbox.
 
         Args:

backend/packages/harness/deerflow/community/aio_sandbox/local_backend.py

@@ -241,7 +241,7 @@ class LocalContainerBackend(SandboxBackend):
 
     # ── SandboxBackend interface ──────────────────────────────────────────
 
-    def create(self, thread_id: str, sandbox_id: str, extra_mounts: list[tuple[str, str, bool]] | None = None) -> SandboxInfo:
+    def create(self, thread_id: str | None, sandbox_id: str, extra_mounts: list[tuple[str, str, bool]] | None = None) -> SandboxInfo:
         """Start a new container and return its connection info.
 
         Args:

backend/packages/harness/deerflow/community/aio_sandbox/remote_backend.py

@@ -21,6 +21,8 @@ import logging
 
 import requests
 
+from deerflow.runtime.user_context import get_effective_user_id
+
 from .backend import SandboxBackend
 from .sandbox_info import SandboxInfo
 
@@ -57,7 +59,7 @@ class RemoteSandboxBackend(SandboxBackend):
 
     def create(
         self,
-        thread_id: str,
+        thread_id: str | None,
         sandbox_id: str,
         extra_mounts: list[tuple[str, str, bool]] | None = None,
     ) -> SandboxInfo:
@@ -130,7 +132,7 @@ class RemoteSandboxBackend(SandboxBackend):
             logger.warning("Provisioner list_running failed: %s", exc)
             return []
 
-    def _provisioner_create(self, thread_id: str, sandbox_id: str, extra_mounts: list[tuple[str, str, bool]] | None = None) -> SandboxInfo:
+    def _provisioner_create(self, thread_id: str | None, sandbox_id: str, extra_mounts: list[tuple[str, str, bool]] | None = None) -> SandboxInfo:
         """POST /api/sandboxes → create Pod + Service."""
         try:
             resp = requests.post(
@@ -138,6 +140,7 @@ class RemoteSandboxBackend(SandboxBackend):
                 json={
                     "sandbox_id": sandbox_id,
                     "thread_id": thread_id,
+                    "user_id": get_effective_user_id(),
                 },
                 timeout=30,
             )

backend/packages/harness/deerflow/config/app_config.py

@@ -20,6 +20,7 @@ from deerflow.config.memory_config import MemoryConfig, load_memory_config_from_
 from deerflow.config.model_config import ModelConfig
 from deerflow.config.run_events_config import RunEventsConfig
 from deerflow.config.runtime_paths import existing_project_file
+from deerflow.config.safety_finish_reason_config import SafetyFinishReasonConfig
 from deerflow.config.sandbox_config import SandboxConfig
 from deerflow.config.skill_evolution_config import SkillEvolutionConfig
 from deerflow.config.skills_config import SkillsConfig
@@ -29,6 +30,7 @@ from deerflow.config.summarization_config import SummarizationConfig, load_summa
 from deerflow.config.title_config import TitleConfig, load_title_config_from_dict
 from deerflow.config.token_usage_config import TokenUsageConfig
 from deerflow.config.tool_config import ToolConfig, ToolGroupConfig
+from deerflow.config.tool_output_config import ToolOutputConfig
 from deerflow.config.tool_search_config import ToolSearchConfig, load_tool_search_config_from_dict
 
 load_dotenv()
@@ -92,6 +94,7 @@ class AppConfig(BaseModel):
     skills: SkillsConfig = Field(default_factory=SkillsConfig, description="Skills configuration")
     skill_evolution: SkillEvolutionConfig = Field(default_factory=SkillEvolutionConfig, description="Agent-managed skill evolution configuration")
     extensions: ExtensionsConfig = Field(default_factory=ExtensionsConfig, description="Extensions configuration (MCP servers and skills state)")
+    tool_output: ToolOutputConfig = Field(default_factory=ToolOutputConfig, description="Tool output budget protection configuration")
     tool_search: ToolSearchConfig = Field(default_factory=ToolSearchConfig, description="Tool search / deferred loading configuration")
     title: TitleConfig = Field(default_factory=TitleConfig, description="Automatic title generation configuration")
     summarization: SummarizationConfig = Field(default_factory=SummarizationConfig, description="Conversation summarization configuration")
@@ -102,6 +105,7 @@ class AppConfig(BaseModel):
     guardrails: GuardrailsConfig = Field(default_factory=GuardrailsConfig, description="Guardrail middleware configuration")
     circuit_breaker: CircuitBreakerConfig = Field(default_factory=CircuitBreakerConfig, description="LLM circuit breaker configuration")
     loop_detection: LoopDetectionConfig = Field(default_factory=LoopDetectionConfig, description="Loop detection middleware configuration")
+    safety_finish_reason: SafetyFinishReasonConfig = Field(default_factory=SafetyFinishReasonConfig, description="Provider safety-filter finish_reason interception middleware configuration")
     model_config = ConfigDict(extra="allow")
     database: DatabaseConfig = Field(default_factory=DatabaseConfig, description="Unified database backend configuration")
     run_events: RunEventsConfig = Field(default_factory=RunEventsConfig, description="Run event storage configuration")

backend/packages/harness/deerflow/config/extensions_config.py

@@ -141,7 +141,7 @@ class ExtensionsConfig(BaseModel):
         try:
             with open(resolved_path, encoding="utf-8") as f:
                 config_data = json.load(f)
-            cls.resolve_env_variables(config_data)
+            config_data = cls.resolve_env_variables(config_data)
             return cls.model_validate(config_data)
         except json.JSONDecodeError as e:
             raise ValueError(f"Extensions config file at {resolved_path} is not valid JSON: {e}") from e
@@ -149,7 +149,7 @@ class ExtensionsConfig(BaseModel):
             raise RuntimeError(f"Failed to load extensions config from {resolved_path}: {e}") from e
 
     @classmethod
-    def resolve_env_variables(cls, config: dict[str, Any]) -> dict[str, Any]:
+    def resolve_env_variables(cls, config: Any) -> Any:
         """Recursively resolve environment variables in the config.
 
         Environment variables are resolved using the `os.getenv` function. Example: $OPENAI_API_KEY
@@ -160,23 +160,26 @@ class ExtensionsConfig(BaseModel):
         Returns:
             The config with environment variables resolved.
         """
-        for key, value in config.items():
+        if isinstance(config, str):
-            if isinstance(value, str):
+            if not config.startswith("$"):
-                if value.startswith("$"):
+                return config
-                    env_value = os.getenv(value[1:])
+            env_value = os.getenv(config[1:])
-                    if env_value is None:
+            if env_value is None:
-                        # Unresolved placeholder — store empty string so downstream
+                # Unresolved placeholder — store empty string so downstream
-                        # consumers (e.g. MCP servers) don't receive the literal "$VAR"
+                # consumers (e.g. MCP servers) don't receive the literal "$VAR"
-                        # token as an actual environment value.
+                # token as an actual environment value.
-                        config[key] = ""
+                return ""
-                    else:
+            return env_value
-                        config[key] = env_value
+
-                else:
+        if isinstance(config, dict):
-                    config[key] = value
+            return {key: cls.resolve_env_variables(value) for key, value in config.items()}
-            elif isinstance(value, dict):
+
-                config[key] = cls.resolve_env_variables(value)
+        if isinstance(config, list):
-            elif isinstance(value, list):
+            return [cls.resolve_env_variables(item) for item in config]
-                config[key] = [cls.resolve_env_variables(item) if isinstance(item, dict) else item for item in value]
+
+        if isinstance(config, tuple):
+            return tuple(cls.resolve_env_variables(item) for item in config)
+
         return config
 
     def get_enabled_mcp_servers(self) -> dict[str, McpServerConfig]:

backend/packages/harness/deerflow/config/safety_finish_reason_config.py

@@ -0,0 +1,47 @@
+"""Configuration for SafetyFinishReasonMiddleware.
+
+Mirrors the shape of GuardrailsConfig: detectors are loaded by class path
+through ``deerflow.reflection.resolve_variable`` (same loader the
+``guardrails.provider`` config uses) so users can drop in custom provider
+detectors without modifying core code.
+"""
+
+from __future__ import annotations
+
+from pydantic import BaseModel, Field
+
+
+class SafetyDetectorConfig(BaseModel):
+    """One detector entry under ``safety_finish_reason.detectors``."""
+
+    use: str = Field(
+        description=("Class path of a SafetyTerminationDetector implementation (e.g. 'deerflow.agents.middlewares.safety_termination_detectors:OpenAICompatibleContentFilterDetector')."),
+    )
+    config: dict = Field(
+        default_factory=dict,
+        description="Constructor kwargs passed to the detector class.",
+    )
+
+
+class SafetyFinishReasonConfig(BaseModel):
+    """Configuration for the SafetyFinishReasonMiddleware.
+
+    The middleware intercepts AIMessages where the provider signaled a
+    safety-related termination (e.g. OpenAI ``finish_reason='content_filter'``)
+    while still returning tool calls, and suppresses those tool calls so the
+    half-truncated arguments never execute.
+    """
+
+    enabled: bool = Field(
+        default=True,
+        description="Master switch for the SafetyFinishReasonMiddleware.",
+    )
+    detectors: list[SafetyDetectorConfig] | None = Field(
+        default=None,
+        description=(
+            "Custom detector list. Leave unset (None) to use the built-in "
+            "set covering OpenAI-compatible content_filter, Anthropic "
+            "refusal, and Gemini SAFETY/BLOCKLIST/PROHIBITED_CONTENT/SPII/"
+            "RECITATION. Provide a non-null list to fully override."
+        ),
+    )

backend/packages/harness/deerflow/config/title_config.py

@@ -51,3 +51,16 @@ def load_title_config_from_dict(config_dict: dict) -> None:
     """Load title configuration from a dictionary."""
     global _title_config
     _title_config = TitleConfig(**config_dict)
+
+
+def reset_title_config() -> None:
+    """Restore the title configuration to its pristine ``TitleConfig()`` default.
+
+    Public API so that tests do not have to reach into the private
+    ``_title_config`` module attribute. ``AppConfig.from_file()`` calls
+    :func:`load_title_config_from_dict`, which permanently mutates the
+    singleton; tests that need a clean slate between cases should call
+    this between tests.
+    """
+    global _title_config
+    _title_config = TitleConfig()

backend/packages/harness/deerflow/config/tool_output_config.py

@@ -0,0 +1,62 @@
+"""Configuration for tool output budget protection."""
+
+from __future__ import annotations
+
+from pydantic import BaseModel, Field
+
+
+class ToolOutputConfig(BaseModel):
+    """Config section for tool-result output budget enforcement.
+
+    When a tool returns more than ``externalize_min_chars`` characters,
+    the full output is persisted to disk and replaced with a compact
+    preview + file reference.  If disk persistence is unavailable the
+    output falls back to head+tail truncation.
+    """
+
+    enabled: bool = Field(
+        default=True,
+        description="Enable the tool output budget middleware.",
+    )
+    externalize_min_chars: int = Field(
+        default=12_000,
+        ge=0,
+        description="Character threshold to trigger disk externalization. Outputs below this pass through unchanged. Set to 0 to disable externalization (fallback truncation still applies when output exceeds fallback_max_chars).",
+    )
+    preview_head_chars: int = Field(
+        default=2_000,
+        ge=0,
+        description="Characters to keep from the head of the output in the preview.",
+    )
+    preview_tail_chars: int = Field(
+        default=1_000,
+        ge=0,
+        description="Characters to keep from the tail of the output in the preview.",
+    )
+    fallback_max_chars: int = Field(
+        default=30_000,
+        ge=0,
+        description="Maximum characters when disk persistence is unavailable. 0 disables fallback truncation.",
+    )
+    fallback_head_chars: int = Field(
+        default=8_000,
+        ge=0,
+        description="Head characters for fallback truncation.",
+    )
+    fallback_tail_chars: int = Field(
+        default=3_000,
+        ge=0,
+        description="Tail characters for fallback truncation.",
+    )
+    storage_subdir: str = Field(
+        default=".tool-results",
+        description="Subdirectory under the thread outputs path for persisted tool results.",
+    )
+    exempt_tools: list[str] = Field(
+        default_factory=lambda: ["read_file", "read_file_tool"],
+        description="Tool names exempt from budget enforcement (prevents persist→read→persist loops).",
+    )
+    tool_overrides: dict[str, int] = Field(
+        default_factory=dict,
+        description="Per-tool externalize_min_chars overrides. Keys are tool names, values are char thresholds. Use 0 to disable externalization for a specific tool.",
+    )

backend/packages/harness/deerflow/config/tracing_config.py

@@ -147,3 +147,15 @@ def validate_enabled_tracing_providers() -> None:
 def is_tracing_enabled() -> bool:
     """Check if any tracing provider is enabled and fully configured."""
     return get_tracing_config().is_configured
+
+
+def reset_tracing_config() -> None:
+    """Discard the cached :class:`TracingConfig` so the next call rebuilds it.
+
+    Public API so that tests do not have to reach into the private
+    ``_tracing_config`` module attribute. A future internal rename would
+    silently break callers that mutate the attribute directly.
+    """
+    global _tracing_config
+    with _config_lock:
+        _tracing_config = None

backend/packages/harness/deerflow/mcp/cache.py

@@ -87,8 +87,7 @@ def get_cached_mcp_tools() -> list[BaseTool]:
 
     Also checks if the config file has been modified since last initialization,
     and re-initializes if needed. This ensures that changes made through the
-    Gateway API (which runs in a separate process) are reflected in the
+    Gateway API are reflected in the Gateway-embedded LangGraph runtime.
-    LangGraph Server.
 
     Returns:
         List of cached MCP tools.
@@ -134,9 +133,25 @@ def reset_mcp_tools_cache() -> None:
     """Reset the MCP tools cache.
 
     This is useful for testing or when you want to reload MCP tools.
+    Also closes all persistent MCP sessions so they are recreated on
+    the next tool load.
     """
     global _mcp_tools_cache, _cache_initialized, _config_mtime
     _mcp_tools_cache = None
     _cache_initialized = False
     _config_mtime = None
+
+    # Close persistent sessions – they will be recreated by the next
+    # get_mcp_tools() call with the (possibly updated) connection config.
+    try:
+        from deerflow.mcp.session_pool import get_session_pool
+
+        pool = get_session_pool()
+        pool.close_all_sync()
+    except Exception:
+        logger.debug("Could not close MCP session pool on cache reset", exc_info=True)
+
+    from deerflow.mcp.session_pool import reset_session_pool
+
+    reset_session_pool()
     logger.info("MCP tools cache reset")

backend/packages/harness/deerflow/mcp/session_pool.py

@@ -0,0 +1,198 @@
+"""Persistent MCP session pool for stateful tool calls.
+
+When MCP tools are loaded via langchain-mcp-adapters with ``session=None``,
+each tool call creates a new MCP session. For stateful servers like Playwright,
+this means browser state (opened pages, filled forms) is lost between calls.
+
+This module provides a session pool that maintains persistent MCP sessions,
+scoped by ``(server_name, scope_key)`` — typically scope_key is the thread_id —
+so that consecutive tool calls share the same session and server-side state.
+Sessions are evicted in LRU order when the pool reaches capacity.
+"""
+
+from __future__ import annotations
+
+import asyncio
+import logging
+import threading
+from collections import OrderedDict
+from typing import Any
+
+from mcp import ClientSession
+
+logger = logging.getLogger(__name__)
+
+
+class MCPSessionPool:
+    """Manages persistent MCP sessions scoped by ``(server_name, scope_key)``."""
+
+    MAX_SESSIONS = 256
+    SESSION_CLOSE_TIMEOUT = 5.0  # seconds to wait when closing a session via run_coroutine_threadsafe
+
+    def __init__(self) -> None:
+        self._entries: OrderedDict[
+            tuple[str, str],
+            tuple[ClientSession, asyncio.AbstractEventLoop],
+        ] = OrderedDict()
+        self._context_managers: dict[tuple[str, str], Any] = {}
+        # threading.Lock is not bound to any event loop, so it is safe to
+        # acquire from both async paths and sync/worker-thread paths.
+        self._lock = threading.Lock()
+
+    async def get_session(
+        self,
+        server_name: str,
+        scope_key: str,
+        connection: dict[str, Any],
+    ) -> ClientSession:
+        """Get or create a persistent MCP session.
+
+        If an existing session was created in a different event loop (e.g.
+        the sync-wrapper path), it is closed and replaced with a fresh one
+        in the current loop.
+
+        Args:
+            server_name: MCP server name.
+            scope_key: Isolation key (typically thread_id).
+            connection: Connection configuration for ``create_session``.
+
+        Returns:
+            An initialized ``ClientSession``.
+        """
+        key = (server_name, scope_key)
+        current_loop = asyncio.get_running_loop()
+
+        # Phase 1: inspect/mutate the registry under the thread lock (no awaits).
+        cms_to_close: list[tuple[tuple[str, str], Any]] = []
+        with self._lock:
+            if key in self._entries:
+                session, loop = self._entries[key]
+                if loop is current_loop:
+                    self._entries.move_to_end(key)
+                    return session
+                # Session belongs to a different event loop – evict it.
+                cm = self._context_managers.pop(key, None)
+                self._entries.pop(key)
+                if cm is not None:
+                    cms_to_close.append((key, cm))
+
+            # Evict LRU entries when at capacity.
+            while len(self._entries) >= self.MAX_SESSIONS:
+                oldest_key = next(iter(self._entries))
+                cm = self._context_managers.pop(oldest_key, None)
+                self._entries.pop(oldest_key)
+                if cm is not None:
+                    cms_to_close.append((oldest_key, cm))
+
+        # Phase 2: async cleanup outside the lock so we never await while holding it.
+        for close_key, cm in cms_to_close:
+            try:
+                await cm.__aexit__(None, None, None)
+            except Exception:
+                logger.warning("Error closing MCP session %s", close_key, exc_info=True)
+
+        from langchain_mcp_adapters.sessions import create_session
+
+        cm = create_session(connection)
+        session = await cm.__aenter__()
+        await session.initialize()
+
+        # Phase 3: register the new session under the lock.
+        with self._lock:
+            self._entries[key] = (session, current_loop)
+            self._context_managers[key] = cm
+        logger.info("Created persistent MCP session for %s/%s", server_name, scope_key)
+        return session
+
+    # ------------------------------------------------------------------
+    # Cleanup helpers
+    # ------------------------------------------------------------------
+
+    async def _close_cm(self, key: tuple[str, str], cm: Any) -> None:
+        """Close a single context manager (must be called WITHOUT the lock)."""
+        try:
+            await cm.__aexit__(None, None, None)
+        except Exception:
+            logger.warning("Error closing MCP session %s", key, exc_info=True)
+
+    async def close_scope(self, scope_key: str) -> None:
+        """Close all sessions for a given scope (e.g. thread_id)."""
+        with self._lock:
+            keys = [k for k in self._entries if k[1] == scope_key]
+            cms = [(k, self._context_managers.pop(k, None)) for k in keys]
+            for k in keys:
+                self._entries.pop(k, None)
+        for key, cm in cms:
+            if cm is not None:
+                await self._close_cm(key, cm)
+
+    async def close_server(self, server_name: str) -> None:
+        """Close all sessions for a given server."""
+        with self._lock:
+            keys = [k for k in self._entries if k[0] == server_name]
+            cms = [(k, self._context_managers.pop(k, None)) for k in keys]
+            for k in keys:
+                self._entries.pop(k, None)
+        for key, cm in cms:
+            if cm is not None:
+                await self._close_cm(key, cm)
+
+    async def close_all(self) -> None:
+        """Close every managed session."""
+        with self._lock:
+            cms = list(self._context_managers.items())
+            self._context_managers.clear()
+            self._entries.clear()
+        for key, cm in cms:
+            await self._close_cm(key, cm)
+
+    def close_all_sync(self) -> None:
+        """Close all sessions using their owning event loops (synchronous).
+
+        Each session is closed on the loop it was created in, avoiding
+        cross-loop resource leaks.  Safe to call from any thread without an
+        active event loop.
+        """
+        with self._lock:
+            entries = list(self._entries.items())
+            cms = dict(self._context_managers)
+            self._entries.clear()
+            self._context_managers.clear()
+
+        for key, (_, loop) in entries:
+            cm = cms.get(key)
+            if cm is None or loop.is_closed():
+                continue
+            try:
+                if loop.is_running():
+                    # Schedule on the owning loop from this (different) thread.
+                    future = asyncio.run_coroutine_threadsafe(cm.__aexit__(None, None, None), loop)
+                    future.result(timeout=self.SESSION_CLOSE_TIMEOUT)
+                else:
+                    loop.run_until_complete(cm.__aexit__(None, None, None))
+            except Exception:
+                logger.debug("Error closing MCP session %s during sync close", key, exc_info=True)
+
+
+# ------------------------------------------------------------------
+# Module-level singleton
+# ------------------------------------------------------------------
+
+_pool: MCPSessionPool | None = None
+_pool_lock = threading.Lock()
+
+
+def get_session_pool() -> MCPSessionPool:
+    """Return the global session-pool singleton."""
+    global _pool
+    if _pool is None:
+        with _pool_lock:
+            if _pool is None:
+                _pool = MCPSessionPool()
+    return _pool
+
+
+def reset_session_pool() -> None:
+    """Reset the singleton (for tests)."""
+    global _pool
+    _pool = None

backend/packages/harness/deerflow/mcp/tools.py

@@ -1,21 +1,183 @@
-"""Load MCP tools using langchain-mcp-adapters."""
+"""Load MCP tools using langchain-mcp-adapters with stdio session pooling."""
+
+from __future__ import annotations
 
 import logging
+from typing import Any
 
-from langchain_core.tools import BaseTool
+from langchain_core.tools import BaseTool, StructuredTool
+from langgraph.config import get_config
 
 from deerflow.config.extensions_config import ExtensionsConfig
 from deerflow.mcp.client import build_servers_config
 from deerflow.mcp.oauth import build_oauth_tool_interceptor, get_initial_oauth_headers
+from deerflow.mcp.session_pool import get_session_pool
 from deerflow.reflection import resolve_variable
 from deerflow.tools.sync import make_sync_tool_wrapper
+from deerflow.tools.types import Runtime
 
 logger = logging.getLogger(__name__)
 
 
+def _extract_thread_id(runtime: Runtime | None) -> str:
+    """Extract thread_id from the injected tool runtime or LangGraph config."""
+    if runtime is not None:
+        tid = runtime.context.get("thread_id") if runtime.context else None
+        if tid is not None:
+            return str(tid)
+        config = runtime.config or {}
+        tid = config.get("configurable", {}).get("thread_id")
+        if tid is not None:
+            return str(tid)
+
+    try:
+        tid = get_config().get("configurable", {}).get("thread_id")
+        return str(tid) if tid is not None else "default"
+    except RuntimeError:
+        return "default"
+
+
+def _convert_call_tool_result(call_tool_result: Any) -> Any:
+    """Convert an MCP CallToolResult to the LangChain ``content_and_artifact`` format.
+
+    Implements the same conversion logic as the adapter without relying on
+    the private ``langchain_mcp_adapters.tools._convert_call_tool_result`` symbol.
+    """
+    from langchain_core.messages import ToolMessage
+    from langchain_core.messages.content import create_file_block, create_image_block, create_text_block
+    from langchain_core.tools import ToolException
+    from mcp.types import EmbeddedResource, ImageContent, ResourceLink, TextContent, TextResourceContents
+
+    # Pass ToolMessage through directly (interceptor short-circuit).
+    if isinstance(call_tool_result, ToolMessage):
+        return call_tool_result, None
+
+    # Pass LangGraph Command through directly when langgraph is installed.
+    try:
+        from langgraph.types import Command
+
+        if isinstance(call_tool_result, Command):
+            return call_tool_result, None
+    except ImportError:
+        # langgraph is optional; if unavailable, continue with standard MCP content conversion.
+        pass
+
+    # Convert MCP content blocks to LangChain content blocks.
+    lc_content = []
+    for item in call_tool_result.content:
+        if isinstance(item, TextContent):
+            lc_content.append(create_text_block(text=item.text))
+        elif isinstance(item, ImageContent):
+            lc_content.append(create_image_block(base64=item.data, mime_type=item.mimeType))
+        elif isinstance(item, ResourceLink):
+            mime = item.mimeType or None
+            if mime and mime.startswith("image/"):
+                lc_content.append(create_image_block(url=str(item.uri), mime_type=mime))
+            else:
+                lc_content.append(create_file_block(url=str(item.uri), mime_type=mime))
+        elif isinstance(item, EmbeddedResource):
+            from mcp.types import BlobResourceContents
+
+            res = item.resource
+            if isinstance(res, TextResourceContents):
+                lc_content.append(create_text_block(text=res.text))
+            elif isinstance(res, BlobResourceContents):
+                mime = res.mimeType or None
+                if mime and mime.startswith("image/"):
+                    lc_content.append(create_image_block(base64=res.blob, mime_type=mime))
+                else:
+                    lc_content.append(create_file_block(base64=res.blob, mime_type=mime))
+            else:
+                lc_content.append(create_text_block(text=str(res)))
+        else:
+            lc_content.append(create_text_block(text=str(item)))
+
+    if call_tool_result.isError:
+        error_parts = [item["text"] for item in lc_content if isinstance(item, dict) and item.get("type") == "text"]
+        raise ToolException("\n".join(error_parts) if error_parts else str(lc_content))
+
+    artifact = None
+    if call_tool_result.structuredContent is not None:
+        artifact = {"structured_content": call_tool_result.structuredContent}
+
+    return lc_content, artifact
+
+
+def _make_session_pool_tool(
+    tool: BaseTool,
+    server_name: str,
+    connection: dict[str, Any],
+    tool_interceptors: list[Any] | None = None,
+) -> BaseTool:
+    """Wrap an MCP tool so it reuses a persistent session from the pool.
+
+    Replaces the per-call session creation with pool-managed sessions scoped
+    by ``(server_name, thread_id)``.  This ensures stateful MCP servers (e.g.
+    Playwright) keep their state across tool calls within the same thread.
+
+    The configured ``tool_interceptors`` (OAuth, custom) are preserved and
+    applied on every call before invoking the pooled session.
+    """
+    # Strip the server-name prefix to recover the original MCP tool name.
+    original_name = tool.name
+    prefix = f"{server_name}_"
+    if original_name.startswith(prefix):
+        original_name = original_name[len(prefix) :]
+
+    pool = get_session_pool()
+
+    async def call_with_persistent_session(
+        runtime: Runtime | None = None,
+        **arguments: Any,
+    ) -> Any:
+        thread_id = _extract_thread_id(runtime)
+        session = await pool.get_session(server_name, thread_id, connection)
+
+        if tool_interceptors:
+            from langchain_mcp_adapters.interceptors import MCPToolCallRequest
+
+            async def base_handler(request: MCPToolCallRequest) -> Any:
+                return await session.call_tool(request.name, request.args)
+
+            handler = base_handler
+            for interceptor in reversed(tool_interceptors):
+                outer = handler
+
+                async def wrapped(req: Any, _i: Any = interceptor, _h: Any = outer) -> Any:
+                    return await _i(req, _h)
+
+                handler = wrapped
+
+            request = MCPToolCallRequest(
+                name=original_name,
+                args=arguments,
+                server_name=server_name,
+                runtime=runtime,
+            )
+            call_tool_result = await handler(request)
+        else:
+            call_tool_result = await session.call_tool(original_name, arguments)
+
+        return _convert_call_tool_result(call_tool_result)
+
+    return StructuredTool(
+        name=tool.name,
+        description=tool.description,
+        args_schema=tool.args_schema,
+        coroutine=call_with_persistent_session,
+        response_format="content_and_artifact",
+        metadata=tool.metadata,
+    )
+
+
 async def get_mcp_tools() -> list[BaseTool]:
     """Get all tools from enabled MCP servers.
 
+    Tools using stdio transport are wrapped with persistent-session logic so
+    consecutive calls within the same thread reuse the same MCP session.
+    HTTP/SSE tools are returned unwrapped to avoid cross-task TaskGroup
+    cleanup errors.
+
     Returns:
         List of LangChain tools from all enabled MCP servers.
     """
@@ -50,7 +212,7 @@ async def get_mcp_tools() -> list[BaseTool]:
                 existing_headers["Authorization"] = auth_header
                 servers_config[server_name]["headers"] = existing_headers
 
-        tool_interceptors = []
+        tool_interceptors: list[Any] = []
         oauth_interceptor = build_oauth_tool_interceptor(extensions_config)
         if oauth_interceptor is not None:
             tool_interceptors.append(oauth_interceptor)
@@ -74,20 +236,49 @@ async def get_mcp_tools() -> list[BaseTool]:
                 elif interceptor is not None:
                     logger.warning(f"Builder {interceptor_path} returned non-callable {type(interceptor).__name__}; skipping")
             except Exception as e:
-                logger.warning(f"Failed to load MCP interceptor {interceptor_path}: {e}", exc_info=True)
+                logger.warning(
+                    f"Failed to load MCP interceptor {interceptor_path}: {e}",
+                    exc_info=True,
+                )
 
-        client = MultiServerMCPClient(servers_config, tool_interceptors=tool_interceptors, tool_name_prefix=True)
+        client = MultiServerMCPClient(
+            servers_config,
+            tool_interceptors=tool_interceptors,
+            tool_name_prefix=True,
+        )
 
-        # Get all tools from all servers
+        # Get all tools from all servers (discovers tool definitions via
+        # temporary sessions – the persistent-session wrapping is applied below).
         tools = await client.get_tools()
         logger.info(f"Successfully loaded {len(tools)} tool(s) from MCP servers")
 
-        # Patch tools to support sync invocation, as deerflow client streams synchronously
+        # Wrap each tool with persistent-session logic.
+        # Only pool stdio sessions. HTTP/SSE transports use anyio TaskGroups
+        # internally which cannot be closed from a different async task, so
+        # pooling them causes RuntimeError on cleanup (see #3203).
+        wrapped_tools: list[BaseTool] = []
         for tool in tools:
+            tool_server: str | None = None
+            for name in servers_config:
+                if tool.name.startswith(f"{name}_"):
+                    tool_server = name
+                    break
+
+            if tool_server is not None:
+                transport = servers_config[tool_server].get("transport", "stdio")
+                if transport == "stdio":
+                    wrapped_tools.append(_make_session_pool_tool(tool, tool_server, servers_config[tool_server], tool_interceptors))
+                else:
+                    wrapped_tools.append(tool)
+            else:
+                wrapped_tools.append(tool)
+
+        # Patch tools to support sync invocation, as deerflow client streams synchronously
+        for tool in wrapped_tools:
             if getattr(tool, "func", None) is None and getattr(tool, "coroutine", None) is not None:
                 tool.func = make_sync_tool_wrapper(tool.coroutine, tool.name)
 
-        return tools
+        return wrapped_tools
 
     except Exception as e:
         logger.error(f"Failed to load MCP tools: {e}", exc_info=True)

backend/packages/harness/deerflow/models/assistant_payload_replay.py

@@ -0,0 +1,124 @@
+"""Helpers for replaying provider-specific assistant message fields.
+
+Several provider adapters need to preserve fields that LangChain stores on the
+original ``AIMessage`` but drops when serializing request payloads. This module
+keeps the assistant-message matching logic shared while letting each provider
+decide which fields to restore.
+"""
+
+from __future__ import annotations
+
+import json
+from collections.abc import Callable, Sequence
+from typing import Any
+
+from langchain_core.messages import AIMessage, BaseMessage
+
+AssistantPayloadRestorer = Callable[[dict[str, Any], AIMessage], None]
+
+
+def restore_assistant_payloads(
+    payload_messages: Sequence[dict[str, Any]],
+    original_messages: Sequence[BaseMessage],
+    restore: AssistantPayloadRestorer,
+) -> None:
+    """Restore provider-specific fields onto serialized assistant payloads."""
+    if len(payload_messages) == len(original_messages):
+        for payload_msg, orig_msg in zip(payload_messages, original_messages):
+            if payload_msg.get("role") == "assistant" and isinstance(orig_msg, AIMessage):
+                restore(payload_msg, orig_msg)
+        return
+
+    ai_messages = [m for m in original_messages if isinstance(m, AIMessage)]
+    assistant_payloads = [m for m in payload_messages if m.get("role") == "assistant"]
+    used_ai_indexes: set[int] = set()
+
+    for ordinal, payload_msg in enumerate(assistant_payloads):
+        ai_msg = _match_ai_message(payload_msg, ai_messages, used_ai_indexes, ordinal)
+        if ai_msg is not None:
+            restore(payload_msg, ai_msg)
+
+
+def restore_additional_kwargs_field(payload_msg: dict[str, Any], orig_msg: AIMessage, field_name: str) -> None:
+    """Copy a provider-specific ``additional_kwargs`` field onto a payload message."""
+    value = orig_msg.additional_kwargs.get(field_name)
+    if value is not None:
+        payload_msg[field_name] = value
+
+
+def restore_reasoning_content(payload_msg: dict[str, Any], orig_msg: AIMessage) -> None:
+    """Copy provider reasoning content onto a serialized assistant payload."""
+    restore_additional_kwargs_field(payload_msg, orig_msg, "reasoning_content")
+
+
+def _match_ai_message(
+    payload_msg: dict[str, Any],
+    ai_messages: Sequence[AIMessage],
+    used_ai_indexes: set[int],
+    fallback_ordinal: int,
+) -> AIMessage | None:
+    payload_key = _assistant_signature(payload_msg)
+    if payload_key is not None:
+        matches = [index for index, ai_msg in enumerate(ai_messages) if index not in used_ai_indexes and _ai_signature(ai_msg) == payload_key]
+        if len(matches) == 1:
+            used_ai_indexes.add(matches[0])
+            return ai_messages[matches[0]]
+
+    fallback_index = _next_unused_index_at_or_after(len(ai_messages), used_ai_indexes, fallback_ordinal)
+    if fallback_index is not None:
+        used_ai_indexes.add(fallback_index)
+        return ai_messages[fallback_index]
+
+    return None
+
+
+def _next_unused_index_at_or_after(count: int, used_ai_indexes: set[int], start: int) -> int | None:
+    """Return the next unused AI index at or after ``start``.
+
+    Scanning forward from the payload's ordinal preserves the positional bias of
+    the previous behaviour while still recovering when serialization drops or
+    reorders messages so the exact ordinal index is already taken. It does not
+    wrap to earlier indexes because those messages may be represented by payload
+    entries that were already dropped.
+    """
+    if count == 0 or start >= count:
+        return None
+    for index in range(start, count):
+        if index not in used_ai_indexes:
+            return index
+    return None
+
+
+def _assistant_signature(payload_msg: dict[str, Any]) -> tuple[str, str] | None:
+    return _signature(
+        payload_msg.get("content"),
+        _tool_call_ids(payload_msg.get("tool_calls") or []),
+    )
+
+
+def _ai_signature(message: AIMessage) -> tuple[str, str] | None:
+    tool_calls = message.tool_calls or message.additional_kwargs.get("tool_calls") or []
+    return _signature(message.content, _tool_call_ids(tool_calls))
+
+
+def _signature(content: Any, tool_call_ids: tuple[str, ...]) -> tuple[str, str] | None:
+    if content in (None, "") and not tool_call_ids:
+        return None
+    return (_stable_repr(content), "|".join(tool_call_ids))
+
+
+def _stable_repr(value: Any) -> str:
+    try:
+        return json.dumps(value, sort_keys=True, ensure_ascii=False)
+    except TypeError:
+        return repr(value)
+
+
+def _tool_call_ids(tool_calls: Sequence[Any]) -> tuple[str, ...]:
+    ids: list[str] = []
+    for tool_call in tool_calls:
+        if isinstance(tool_call, dict):
+            call_id = tool_call.get("id")
+            if isinstance(call_id, str) and call_id:
+                ids.append(call_id)
+    return tuple(ids)

backend/packages/harness/deerflow/models/factory.py

@@ -47,11 +47,24 @@ def _enable_stream_usage_by_default(model_use_path: str, model_settings_from_con
         model_settings_from_config["stream_usage"] = True
 
 
-def create_chat_model(name: str | None = None, thinking_enabled: bool = False, *, app_config: AppConfig | None = None, **kwargs) -> BaseChatModel:
+def create_chat_model(name: str | None = None, thinking_enabled: bool = False, *, app_config: AppConfig | None = None, attach_tracing: bool = True, **kwargs) -> BaseChatModel:
     """Create a chat model instance from the config.
 
     Args:
         name: The name of the model to create. If None, the first model in the config will be used.
+        thinking_enabled: Enable the model's extended-thinking mode when supported.
+        app_config: Explicit application config; falls back to the cached global if omitted.
+        attach_tracing: When True (default), attach tracing callbacks (Langfuse,
+            LangSmith) directly to the model instance. Standalone callers — anything
+            that invokes the model outside a LangGraph run that already wires tracing
+            at the invocation root (``MemoryUpdater``, ad-hoc utilities, etc.) — keep
+            this default so the model-level callback still produces traces. Callers
+            that already attach tracing at the graph root (``make_lead_agent``, the
+            in-graph ``TitleMiddleware``) MUST pass ``attach_tracing=False``; otherwise
+            the same LLM call emits duplicate spans (one rooted at the graph, one at
+            the model) and ``session_id`` / ``user_id`` metadata never reach the trace
+            because the model becomes a nested observation whose ``langfuse_*`` keys
+            get stripped.
 
     Returns:
         A chat model instance.
@@ -149,9 +162,10 @@ def create_chat_model(name: str | None = None, thinking_enabled: bool = False, *
 
     model_instance = model_class(**kwargs, **model_settings_from_config)
 
-    callbacks = build_tracing_callbacks()
+    if attach_tracing:
-    if callbacks:
+        callbacks = build_tracing_callbacks()
-        existing_callbacks = model_instance.callbacks or []
+        if callbacks:
-        model_instance.callbacks = [*existing_callbacks, *callbacks]
+            existing_callbacks = model_instance.callbacks or []
-        logger.debug(f"Tracing attached to model '{name}' with providers={len(callbacks)}")
+            model_instance.callbacks = [*existing_callbacks, *callbacks]
+            logger.debug(f"Tracing attached to model '{name}' with providers={len(callbacks)}")
     return model_instance

backend/packages/harness/deerflow/models/patched_deepseek.py

@@ -10,9 +10,10 @@ on all assistant messages when thinking mode is enabled.
 from typing import Any
 
 from langchain_core.language_models import LanguageModelInput
-from langchain_core.messages import AIMessage
 from langchain_deepseek import ChatDeepSeek
 
+from deerflow.models.assistant_payload_replay import restore_assistant_payloads, restore_reasoning_content
+
 
 class PatchedChatDeepSeek(ChatDeepSeek):
     """ChatDeepSeek with proper reasoning_content preservation.
@@ -49,25 +50,10 @@ class PatchedChatDeepSeek(ChatDeepSeek):
         # Call parent to get the base payload
         payload = super()._get_request_payload(input_, stop=stop, **kwargs)
 
-        # Match payload messages with original messages to restore reasoning_content
+        restore_assistant_payloads(
-        payload_messages = payload.get("messages", [])
+            payload.get("messages", []),
-
+            original_messages,
-        # The payload messages and original messages should be in the same order
+            restore_reasoning_content,
-        # Iterate through both and match by position
+        )
-        if len(payload_messages) == len(original_messages):
-            for payload_msg, orig_msg in zip(payload_messages, original_messages):
-                if payload_msg.get("role") == "assistant" and isinstance(orig_msg, AIMessage):
-                    reasoning_content = orig_msg.additional_kwargs.get("reasoning_content")
-                    if reasoning_content is not None:
-                        payload_msg["reasoning_content"] = reasoning_content
-        else:
-            # Fallback: match by counting assistant messages
-            ai_messages = [m for m in original_messages if isinstance(m, AIMessage)]
-            assistant_payloads = [(i, m) for i, m in enumerate(payload_messages) if m.get("role") == "assistant"]
-
-            for (idx, payload_msg), ai_msg in zip(assistant_payloads, ai_messages):
-                reasoning_content = ai_msg.additional_kwargs.get("reasoning_content")
-                if reasoning_content is not None:
-                    payload_messages[idx]["reasoning_content"] = reasoning_content
 
         return payload

backend/packages/harness/deerflow/models/patched_mimo.py

@@ -0,0 +1,140 @@
+"""Patched ChatOpenAI adapter for Xiaomi MiMo reasoning_content replay.
+
+MiMo's OpenAI-compatible API returns ``reasoning_content`` in thinking mode and
+requires that value to be replayed on historical assistant messages in
+multi-turn agent conversations. Standard ``langchain_openai.ChatOpenAI`` drops
+that provider-specific field, which can cause HTTP 400 errors once tool calls
+enter the conversation history.
+"""
+
+from __future__ import annotations
+
+from collections.abc import Mapping
+from typing import Any
+
+from langchain_core.language_models import LanguageModelInput
+from langchain_core.messages import AIMessage, AIMessageChunk
+from langchain_core.outputs import ChatGeneration, ChatGenerationChunk, ChatResult
+from langchain_openai import ChatOpenAI
+
+from deerflow.models.assistant_payload_replay import restore_assistant_payloads, restore_reasoning_content
+
+_MISSING = object()
+
+
+def _extract_reasoning_content(value: Any) -> str | object:
+    """Return reasoning_content from a dict/Pydantic object, preserving empty strings."""
+    if isinstance(value, Mapping):
+        if "reasoning_content" in value and value["reasoning_content"] is not None:
+            return value["reasoning_content"]
+        return _MISSING
+
+    reasoning = getattr(value, "reasoning_content", _MISSING)
+    if reasoning is not _MISSING and reasoning is not None:
+        return reasoning
+
+    model_extra = getattr(value, "model_extra", None)
+    if isinstance(model_extra, Mapping) and "reasoning_content" in model_extra and model_extra["reasoning_content"] is not None:
+        return model_extra["reasoning_content"]
+
+    return _MISSING
+
+
+def _with_reasoning_content(message: AIMessage | AIMessageChunk, reasoning: str) -> AIMessage | AIMessageChunk:
+    additional_kwargs = dict(message.additional_kwargs)
+    if additional_kwargs.get("reasoning_content") != reasoning:
+        additional_kwargs["reasoning_content"] = reasoning
+    return message.model_copy(update={"additional_kwargs": additional_kwargs})
+
+
+def _get_typed_choice_message(response: Any, index: int) -> Any:
+    choices = getattr(response, "choices", None)
+    if choices is None:
+        return None
+    try:
+        return choices[index].message
+    except (AttributeError, IndexError, TypeError):
+        return None
+
+
+class PatchedChatMiMo(ChatOpenAI):
+    """ChatOpenAI with ``reasoning_content`` preservation for MiMo thinking mode."""
+
+    @classmethod
+    def is_lc_serializable(cls) -> bool:
+        return True
+
+    @property
+    def lc_secrets(self) -> dict[str, str]:
+        return {"api_key": "MIMO_API_KEY", "openai_api_key": "MIMO_API_KEY"}
+
+    def _get_request_payload(
+        self,
+        input_: LanguageModelInput,
+        *,
+        stop: list[str] | None = None,
+        **kwargs: Any,
+    ) -> dict:
+        original_messages = self._convert_input(input_).to_messages()
+        payload = super()._get_request_payload(input_, stop=stop, **kwargs)
+        restore_assistant_payloads(
+            payload.get("messages", []),
+            original_messages,
+            restore_reasoning_content,
+        )
+
+        return payload
+
+    def _convert_chunk_to_generation_chunk(
+        self,
+        chunk: dict,
+        default_chunk_class: type,
+        base_generation_info: dict | None,
+    ) -> ChatGenerationChunk | None:
+        generation_chunk = super()._convert_chunk_to_generation_chunk(
+            chunk,
+            default_chunk_class,
+            base_generation_info,
+        )
+        if generation_chunk is None:
+            return None
+
+        choices = chunk.get("choices", [])
+        if choices:
+            delta = choices[0].get("delta") or {}
+            reasoning = _extract_reasoning_content(delta)
+            if reasoning is not _MISSING and isinstance(generation_chunk.message, AIMessageChunk):
+                generation_chunk = ChatGenerationChunk(
+                    message=_with_reasoning_content(generation_chunk.message, reasoning),
+                    generation_info=generation_chunk.generation_info,
+                )
+
+        return generation_chunk
+
+    def _create_chat_result(
+        self,
+        response: dict | Any,
+        generation_info: dict | None = None,
+    ) -> ChatResult:
+        result = super()._create_chat_result(response, generation_info)
+        response_dict = response if isinstance(response, dict) else response.model_dump()
+        choices = response_dict.get("choices", [])
+
+        patched_generations: list[ChatGeneration] | None = None
+        for index, generation in enumerate(result.generations):
+            choice = choices[index] if index < len(choices) else {}
+            choice_message = choice.get("message", {}) if isinstance(choice, Mapping) else {}
+            reasoning = _extract_reasoning_content(choice_message)
+            if reasoning is _MISSING and not isinstance(response, dict):
+                reasoning = _extract_reasoning_content(_get_typed_choice_message(response, index))
+
+            message = generation.message
+            if reasoning is not _MISSING and isinstance(message, AIMessage):
+                if patched_generations is None:
+                    patched_generations = list(result.generations)
+                patched_generations[index] = ChatGeneration(
+                    message=_with_reasoning_content(message, reasoning),
+                    generation_info=generation.generation_info,
+                )
+
+        return ChatResult(generations=patched_generations or result.generations, llm_output=result.llm_output)

backend/packages/harness/deerflow/models/patched_openai.py

@@ -27,6 +27,8 @@ from langchain_core.language_models import LanguageModelInput
 from langchain_core.messages import AIMessage
 from langchain_openai import ChatOpenAI
 
+from deerflow.models.assistant_payload_replay import restore_assistant_payloads
+
 
 class PatchedChatOpenAI(ChatOpenAI):
     """ChatOpenAI with ``thought_signature`` preservation for Gemini thinking via OpenAI gateway.
@@ -75,18 +77,7 @@ class PatchedChatOpenAI(ChatOpenAI):
         # Obtain the base payload from the parent implementation.
         payload = super()._get_request_payload(input_, stop=stop, **kwargs)
 
-        payload_messages = payload.get("messages", [])
+        restore_assistant_payloads(payload.get("messages", []), original_messages, _restore_tool_call_signatures)
-
-        if len(payload_messages) == len(original_messages):
-            for payload_msg, orig_msg in zip(payload_messages, original_messages):
-                if payload_msg.get("role") == "assistant" and isinstance(orig_msg, AIMessage):
-                    _restore_tool_call_signatures(payload_msg, orig_msg)
-        else:
-            # Fallback: match assistant-role entries positionally against AIMessages.
-            ai_messages = [m for m in original_messages if isinstance(m, AIMessage)]
-            assistant_payloads = [(i, m) for i, m in enumerate(payload_messages) if m.get("role") == "assistant"]
-            for (_, payload_msg), ai_msg in zip(assistant_payloads, ai_messages):
-                _restore_tool_call_signatures(payload_msg, ai_msg)
 
         return payload
 

backend/packages/harness/deerflow/persistence/feedback/sql.py

@@ -13,6 +13,7 @@ from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker
 
 from deerflow.persistence.feedback.model import FeedbackRow
 from deerflow.runtime.user_context import AUTO, _AutoSentinel, resolve_user_id
+from deerflow.utils.time import coerce_iso
 
 
 class FeedbackRepository:
@@ -24,7 +25,8 @@ class FeedbackRepository:
         d = row.to_dict()
         val = d.get("created_at")
         if isinstance(val, datetime):
-            d["created_at"] = val.isoformat()
+            # SQLite drops tzinfo on read; normalize via ``coerce_iso`` so output is always tz-aware.
+            d["created_at"] = coerce_iso(val)
         return d
 
     async def create(

backend/packages/harness/deerflow/persistence/run/sql.py

@@ -17,6 +17,7 @@ from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker
 from deerflow.persistence.run.model import RunRow
 from deerflow.runtime.runs.store.base import RunStore
 from deerflow.runtime.user_context import AUTO, _AutoSentinel, resolve_user_id
+from deerflow.utils.time import coerce_iso
 
 
 class RunRepository(RunStore):
@@ -68,11 +69,13 @@ class RunRepository(RunStore):
         # Remap JSON columns to match RunStore interface
         d["metadata"] = d.pop("metadata_json", {})
         d["kwargs"] = d.pop("kwargs_json", {})
-        # Convert datetime to ISO string for consistency with MemoryRunStore
+        # Convert datetime to ISO string for consistency with MemoryRunStore.
+        # SQLite drops tzinfo on read despite ``DateTime(timezone=True)`` —
+        # ``coerce_iso`` normalizes naive datetimes as UTC.
         for key in ("created_at", "updated_at"):
             val = d.get(key)
             if isinstance(val, datetime):
-                d[key] = val.isoformat()
+                d[key] = coerce_iso(val)
         return d
 
     async def put(
@@ -91,25 +94,35 @@ class RunRepository(RunStore):
         created_at=None,
         follow_up_to_run_id=None,
     ):
+        """Insert or update a run row.
+
+        ``RunManager`` retries ``put`` after transient SQLite failures.  Making
+        this operation idempotent prevents a successful-but-unacknowledged first
+        commit from turning the retry into a primary-key failure.
+        """
         resolved_user_id = resolve_user_id(user_id, method_name="RunRepository.put")
         now = datetime.now(UTC)
-        row = RunRow(
+        created = datetime.fromisoformat(created_at) if created_at else now
-            run_id=run_id,
+        values = {
-            thread_id=thread_id,
+            "thread_id": thread_id,
-            assistant_id=assistant_id,
+            "assistant_id": assistant_id,
-            user_id=resolved_user_id,
+            "user_id": resolved_user_id,
-            model_name=self._normalize_model_name(model_name),
+            "model_name": self._normalize_model_name(model_name),
-            status=status,
+            "status": status,
-            multitask_strategy=multitask_strategy,
+            "multitask_strategy": multitask_strategy,
-            metadata_json=self._safe_json(metadata) or {},
+            "metadata_json": self._safe_json(metadata) or {},
-            kwargs_json=self._safe_json(kwargs) or {},
+            "kwargs_json": self._safe_json(kwargs) or {},
-            error=error,
+            "error": error,
-            follow_up_to_run_id=follow_up_to_run_id,
+            "follow_up_to_run_id": follow_up_to_run_id,
-            created_at=datetime.fromisoformat(created_at) if created_at else now,
+            "updated_at": now,
-            updated_at=now,
+        }
-        )
         async with self._sf() as session:
-            session.add(row)
+            row = await session.get(RunRow, run_id)
+            if row is None:
+                session.add(RunRow(run_id=run_id, created_at=created, **values))
+            else:
+                for key, value in values.items():
+                    setattr(row, key, value)
             await session.commit()
 
     async def get(
@@ -143,12 +156,18 @@ class RunRepository(RunStore):
             result = await session.execute(stmt)
             return [self._row_to_dict(r) for r in result.scalars()]
 
-    async def update_status(self, run_id, status, *, error=None):
+    async def update_status(self, run_id, status, *, error=None) -> bool:
         values: dict[str, Any] = {"status": status, "updated_at": datetime.now(UTC)}
         if error is not None:
             values["error"] = error
         async with self._sf() as session:
-            await session.execute(update(RunRow).where(RunRow.run_id == run_id).values(**values))
+            result = await session.execute(update(RunRow).where(RunRow.run_id == run_id).values(**values))
+            await session.commit()
+            return result.rowcount != 0
+
+    async def update_model_name(self, run_id, model_name):
+        async with self._sf() as session:
+            await session.execute(update(RunRow).where(RunRow.run_id == run_id).values(model_name=self._normalize_model_name(model_name), updated_at=datetime.now(UTC)))
             await session.commit()
 
     async def delete(
@@ -179,6 +198,26 @@ class RunRepository(RunStore):
             result = await session.execute(stmt)
             return [self._row_to_dict(r) for r in result.scalars()]
 
+    async def list_inflight(self, *, before=None):
+        """Return persisted active runs for startup recovery."""
+        if before is None:
+            before_dt = datetime.now(UTC)
+        elif isinstance(before, datetime):
+            before_dt = before
+        else:
+            before_dt = datetime.fromisoformat(before)
+        stmt = (
+            select(RunRow)
+            .where(
+                RunRow.status.in_(("pending", "running")),
+                RunRow.created_at <= before_dt,
+            )
+            .order_by(RunRow.created_at.asc())
+        )
+        async with self._sf() as session:
+            result = await session.execute(stmt)
+            return [self._row_to_dict(r) for r in result.scalars()]
+
     async def update_run_completion(
         self,
         run_id: str,
@@ -195,8 +234,11 @@ class RunRepository(RunStore):
         last_ai_message: str | None = None,
         first_human_message: str | None = None,
         error: str | None = None,
-    ) -> None:
+    ) -> bool:
-        """Update status + token usage + convenience fields on run completion."""
+        """Update status + token usage + convenience fields on run completion.
+
+        Returns ``False`` when no run row matched the requested ``run_id``.
+        """
         values: dict[str, Any] = {
             "status": status,
             "total_input_tokens": total_input_tokens,
@@ -216,12 +258,52 @@ class RunRepository(RunStore):
         if error is not None:
             values["error"] = error
         async with self._sf() as session:
-            await session.execute(update(RunRow).where(RunRow.run_id == run_id).values(**values))
+            result = await session.execute(update(RunRow).where(RunRow.run_id == run_id).values(**values))
+            await session.commit()
+            return result.rowcount != 0
+
+    async def update_run_progress(
+        self,
+        run_id: str,
+        *,
+        total_input_tokens: int | None = None,
+        total_output_tokens: int | None = None,
+        total_tokens: int | None = None,
+        llm_call_count: int | None = None,
+        lead_agent_tokens: int | None = None,
+        subagent_tokens: int | None = None,
+        middleware_tokens: int | None = None,
+        message_count: int | None = None,
+        last_ai_message: str | None = None,
+        first_human_message: str | None = None,
+    ) -> None:
+        """Update token usage + convenience fields while a run is still active."""
+        values: dict[str, Any] = {"updated_at": datetime.now(UTC)}
+        optional_counters = {
+            "total_input_tokens": total_input_tokens,
+            "total_output_tokens": total_output_tokens,
+            "total_tokens": total_tokens,
+            "llm_call_count": llm_call_count,
+            "lead_agent_tokens": lead_agent_tokens,
+            "subagent_tokens": subagent_tokens,
+            "middleware_tokens": middleware_tokens,
+            "message_count": message_count,
+        }
+        for key, value in optional_counters.items():
+            if value is not None:
+                values[key] = value
+        if last_ai_message is not None:
+            values["last_ai_message"] = last_ai_message[:2000]
+        if first_human_message is not None:
+            values["first_human_message"] = first_human_message[:2000]
+        async with self._sf() as session:
+            await session.execute(update(RunRow).where(RunRow.run_id == run_id, RunRow.status == "running").values(**values))
             await session.commit()
 
-    async def aggregate_tokens_by_thread(self, thread_id: str) -> dict[str, Any]:
+    async def aggregate_tokens_by_thread(self, thread_id: str, *, include_active: bool = False) -> dict[str, Any]:
         """Aggregate token usage via a single SQL GROUP BY query."""
-        _completed = RunRow.status.in_(("success", "error"))
+        statuses = ("success", "error", "running") if include_active else ("success", "error")
+        _completed = RunRow.status.in_(statuses)
         _thread = RunRow.thread_id == thread_id
         model_name = func.coalesce(RunRow.model_name, "unknown")
 

backend/packages/harness/deerflow/persistence/thread_meta/sql.py

@@ -13,6 +13,7 @@ from deerflow.persistence.json_compat import json_match
 from deerflow.persistence.thread_meta.base import InvalidMetadataFilterError, ThreadMetaStore
 from deerflow.persistence.thread_meta.model import ThreadMetaRow
 from deerflow.runtime.user_context import AUTO, _AutoSentinel, resolve_user_id
+from deerflow.utils.time import coerce_iso
 
 logger = logging.getLogger(__name__)
 
@@ -28,7 +29,9 @@ class ThreadMetaRepository(ThreadMetaStore):
         for key in ("created_at", "updated_at"):
             val = d.get(key)
             if isinstance(val, datetime):
-                d[key] = val.isoformat()
+                # SQLite drops tzinfo despite ``DateTime(timezone=True)``;
+                # ``coerce_iso`` normalizes naive values as UTC so the wire format always carries tz.
+                d[key] = coerce_iso(val)
         return d
 
     async def create(

backend/packages/harness/deerflow/runtime/checkpointer/async_provider.py

@@ -34,6 +34,19 @@ from deerflow.runtime.store._sqlite_utils import ensure_sqlite_parent_dir, resol
 
 logger = logging.getLogger(__name__)
 
+
+def _prepare_sqlite_checkpointer_path(raw: str) -> str:
+    conn_str = resolve_sqlite_conn_str(raw)
+    ensure_sqlite_parent_dir(conn_str)
+    return conn_str
+
+
+def _prepare_database_sqlite_checkpointer_path(db_config) -> str:
+    conn_str = db_config.checkpointer_sqlite_path
+    ensure_sqlite_parent_dir(conn_str)
+    return conn_str
+
+
 # ---------------------------------------------------------------------------
 # Async factory
 # ---------------------------------------------------------------------------
@@ -54,8 +67,7 @@ async def _async_checkpointer(config) -> AsyncIterator[Checkpointer]:
         except ImportError as exc:
             raise ImportError(SQLITE_INSTALL) from exc
 
-        conn_str = resolve_sqlite_conn_str(config.connection_string or "store.db")
+        conn_str = await asyncio.to_thread(_prepare_sqlite_checkpointer_path, config.connection_string or "store.db")
-        await asyncio.to_thread(ensure_sqlite_parent_dir, conn_str)
         async with AsyncSqliteSaver.from_conn_string(conn_str) as saver:
             await saver.setup()
             yield saver
@@ -98,8 +110,7 @@ async def _async_checkpointer_from_database(db_config) -> AsyncIterator[Checkpoi
         except ImportError as exc:
             raise ImportError(SQLITE_INSTALL) from exc
 
-        conn_str = db_config.checkpointer_sqlite_path
+        conn_str = await asyncio.to_thread(_prepare_database_sqlite_checkpointer_path, db_config)
-        ensure_sqlite_parent_dir(conn_str)
         async with AsyncSqliteSaver.from_conn_string(conn_str) as saver:
             await saver.setup()
             yield saver

backend/packages/harness/deerflow/runtime/events/store/db.py

@@ -17,6 +17,7 @@ from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker
 from deerflow.persistence.models.run_event import RunEventRow
 from deerflow.runtime.events.store.base import RunEventStore
 from deerflow.runtime.user_context import AUTO, _AutoSentinel, get_current_user, resolve_user_id
+from deerflow.utils.time import coerce_iso
 
 logger = logging.getLogger(__name__)
 
@@ -32,7 +33,9 @@ class DbRunEventStore(RunEventStore):
         d["metadata"] = d.pop("event_metadata", {})
         val = d.get("created_at")
         if isinstance(val, datetime):
-            d["created_at"] = val.isoformat()
+            # SQLite drops tzinfo on read despite ``DateTime(timezone=True)``;
+            # ``coerce_iso`` normalizes naive datetimes as UTC.
+            d["created_at"] = coerce_iso(val)
         d.pop("id", None)
         # Restore structured content that was JSON-serialized on write.
         raw = d.get("content", "")
@@ -141,10 +144,13 @@ class DbRunEventStore(RunEventStore):
     async def put_batch(self, events):
         if not events:
             return []
+        thread_ids = {e["thread_id"] for e in events}
+        if len(thread_ids) > 1:
+            raise ValueError(f"put_batch requires all events to belong to the same thread; got {thread_ids!r}")
         user_id = self._user_id_from_context()
         async with self._sf() as session:
             async with session.begin():
-                # Get max seq for the thread (assume all events in batch belong to same thread).
+                # All events belong to the same thread (validated above).
                 thread_id = events[0]["thread_id"]
                 max_seq = await self._max_seq_for_thread(session, thread_id)
                 seq = max_seq or 0

backend/packages/harness/deerflow/runtime/events/store/jsonl.py

@@ -6,6 +6,15 @@ Each run's events are stored in a single file:
 All categories (message, trace, lifecycle) are in the same file.
 This backend is suitable for lightweight single-node deployments.
 
+**Single-process guarantee**: the in-memory seq counter is process-local.
+Multi-process deployments sharing the same directory will produce duplicate
+or non-monotonic seq values. Use ``DbRunEventStore`` for multi-process or
+high-concurrency deployments.
+
+File I/O is offloaded to a thread pool via ``asyncio.to_thread`` so the
+event loop is never blocked. Per-thread ``asyncio.Lock`` objects serialise
+writes within a single process to prevent interleaved JSONL lines.
+
 Known trade-off: ``list_messages()`` must scan all run files for a
 thread since messages from multiple runs need unified seq ordering.
 ``list_events()`` reads only one file -- the fast path.
@@ -13,6 +22,7 @@ thread since messages from multiple runs need unified seq ordering.
 
 from __future__ import annotations
 
+import asyncio
 import json
 import logging
 import re
@@ -30,6 +40,11 @@ class JsonlRunEventStore(RunEventStore):
     def __init__(self, base_dir: str | Path | None = None):
         self._base_dir = Path(base_dir) if base_dir else Path(".deer-flow")
         self._seq_counters: dict[str, int] = {}  # thread_id -> current max seq
+        # Per-thread asyncio.Lock — serialises concurrent writes within one process.
+        self._write_locks: dict[str, asyncio.Lock] = {}
+
+    def _get_write_lock(self, thread_id: str) -> asyncio.Lock:
+        return self._write_locks.setdefault(thread_id, asyncio.Lock())
 
     @staticmethod
     def _validate_id(value: str, label: str) -> str:
@@ -50,10 +65,8 @@ class JsonlRunEventStore(RunEventStore):
         self._seq_counters[thread_id] = self._seq_counters.get(thread_id, 0) + 1
         return self._seq_counters[thread_id]
 
-    def _ensure_seq_loaded(self, thread_id: str) -> None:
+    def _compute_max_seq(self, thread_id: str) -> int:
-        """Load max seq from existing files if not yet cached."""
+        """Scan all run files for a thread and return the current max seq (blocking I/O)."""
-        if thread_id in self._seq_counters:
-            return
         max_seq = 0
         thread_dir = self._thread_dir(thread_id)
         if thread_dir.exists():
@@ -64,7 +77,13 @@ class JsonlRunEventStore(RunEventStore):
                         max_seq = max(max_seq, record.get("seq", 0))
                     except json.JSONDecodeError:
                         logger.debug("Skipping malformed JSONL line in %s", f)
-                        continue
+        return max_seq
+
+    async def _ensure_seq_loaded(self, thread_id: str) -> None:
+        """Load max seq from existing files into the in-memory counter (non-blocking)."""
+        if thread_id in self._seq_counters:
+            return
+        max_seq = await asyncio.to_thread(self._compute_max_seq, thread_id)
         self._seq_counters[thread_id] = max_seq
 
     def _write_record(self, record: dict) -> None:
@@ -74,7 +93,7 @@ class JsonlRunEventStore(RunEventStore):
             f.write(json.dumps(record, default=str, ensure_ascii=False) + "\n")
 
     def _read_thread_events(self, thread_id: str) -> list[dict]:
-        """Read all events for a thread, sorted by seq."""
+        """Read all events for a thread, sorted by seq (blocking I/O)."""
         events = []
         thread_dir = self._thread_dir(thread_id)
         if not thread_dir.exists():
@@ -87,12 +106,11 @@ class JsonlRunEventStore(RunEventStore):
                     events.append(json.loads(line))
                 except json.JSONDecodeError:
                     logger.debug("Skipping malformed JSONL line in %s", f)
-                    continue
         events.sort(key=lambda e: e.get("seq", 0))
         return events
 
     def _read_run_events(self, thread_id: str, run_id: str) -> list[dict]:
-        """Read events for a specific run file."""
+        """Read events for a specific run file (blocking I/O)."""
         path = self._run_file(thread_id, run_id)
         if not path.exists():
             return []
@@ -104,25 +122,36 @@ class JsonlRunEventStore(RunEventStore):
                 events.append(json.loads(line))
             except json.JSONDecodeError:
                 logger.debug("Skipping malformed JSONL line in %s", path)
-                continue
         events.sort(key=lambda e: e.get("seq", 0))
         return events
 
+    def _delete_thread_files(self, thread_id: str) -> None:
+        thread_dir = self._thread_dir(thread_id)
+        if thread_dir.exists():
+            for f in thread_dir.glob("*.jsonl"):
+                f.unlink()
+
+    def _delete_run_file(self, thread_id: str, run_id: str) -> None:
+        path = self._run_file(thread_id, run_id)
+        if path.exists():
+            path.unlink()
+
     async def put(self, *, thread_id, run_id, event_type, category, content="", metadata=None, created_at=None):
-        self._ensure_seq_loaded(thread_id)
+        async with self._get_write_lock(thread_id):
-        seq = self._next_seq(thread_id)
+            await self._ensure_seq_loaded(thread_id)
-        record = {
+            seq = self._next_seq(thread_id)
-            "thread_id": thread_id,
+            record = {
-            "run_id": run_id,
+                "thread_id": thread_id,
-            "event_type": event_type,
+                "run_id": run_id,
-            "category": category,
+                "event_type": event_type,
-            "content": content,
+                "category": category,
-            "metadata": metadata or {},
+                "content": content,
-            "seq": seq,
+                "metadata": metadata or {},
-            "created_at": created_at or datetime.now(UTC).isoformat(),
+                "seq": seq,
-        }
+                "created_at": created_at or datetime.now(UTC).isoformat(),
-        self._write_record(record)
+            }
-        return record
+            await asyncio.to_thread(self._write_record, record)
+            return record
 
     async def put_batch(self, events):
         if not events:
@@ -134,7 +163,7 @@ class JsonlRunEventStore(RunEventStore):
         return results
 
     async def list_messages(self, thread_id, *, limit=50, before_seq=None, after_seq=None):
-        all_events = self._read_thread_events(thread_id)
+        all_events = await asyncio.to_thread(self._read_thread_events, thread_id)
         messages = [e for e in all_events if e.get("category") == "message"]
 
         if before_seq is not None:
@@ -147,13 +176,13 @@ class JsonlRunEventStore(RunEventStore):
             return messages[-limit:]
 
     async def list_events(self, thread_id, run_id, *, event_types=None, limit=500):
-        events = self._read_run_events(thread_id, run_id)
+        events = await asyncio.to_thread(self._read_run_events, thread_id, run_id)
         if event_types is not None:
             events = [e for e in events if e.get("event_type") in event_types]
         return events[:limit]
 
     async def list_messages_by_run(self, thread_id, run_id, *, limit=50, before_seq=None, after_seq=None):
-        events = self._read_run_events(thread_id, run_id)
+        events = await asyncio.to_thread(self._read_run_events, thread_id, run_id)
         filtered = [e for e in events if e.get("category") == "message"]
         if before_seq is not None:
             filtered = [e for e in filtered if e.get("seq", 0) < before_seq]
@@ -165,23 +194,25 @@ class JsonlRunEventStore(RunEventStore):
             return filtered[-limit:] if len(filtered) > limit else filtered
 
     async def count_messages(self, thread_id):
-        all_events = self._read_thread_events(thread_id)
+        all_events = await asyncio.to_thread(self._read_thread_events, thread_id)
         return sum(1 for e in all_events if e.get("category") == "message")
 
     async def delete_by_thread(self, thread_id):
-        all_events = self._read_thread_events(thread_id)
+        async with self._get_write_lock(thread_id):
-        count = len(all_events)
+            all_events = await asyncio.to_thread(self._read_thread_events, thread_id)
-        thread_dir = self._thread_dir(thread_id)
+            count = len(all_events)
-        if thread_dir.exists():
+            await asyncio.to_thread(self._delete_thread_files, thread_id)
-            for f in thread_dir.glob("*.jsonl"):
+            self._seq_counters.pop(thread_id, None)
-                f.unlink()
+            # Pop the lock inside the held scope to minimise the window where a new caller
-        self._seq_counters.pop(thread_id, None)
+            # could obtain a fresh lock while a waiting coroutine still holds the old one.
-        return count
+            # Note: coroutines that already acquired a reference to this lock before the
+            # delete will still proceed after we release — this is an accepted narrow race.
+            self._write_locks.pop(thread_id, None)
+            return count
 
     async def delete_by_run(self, thread_id, run_id):
-        events = self._read_run_events(thread_id, run_id)
+        async with self._get_write_lock(thread_id):
-        count = len(events)
+            events = await asyncio.to_thread(self._read_run_events, thread_id, run_id)
-        path = self._run_file(thread_id, run_id)
+            count = len(events)
-        if path.exists():
+            await asyncio.to_thread(self._delete_run_file, thread_id, run_id)
-            path.unlink()
+            return count
-        return count

backend/packages/harness/deerflow/runtime/journal.py

@@ -20,7 +20,7 @@ from __future__ import annotations
 import asyncio
 import logging
 import time
-from collections.abc import Mapping
+from collections.abc import Awaitable, Callable, Mapping
 from datetime import UTC, datetime
 from typing import TYPE_CHECKING, Any, cast
 from uuid import UUID
@@ -46,6 +46,8 @@ class RunJournal(BaseCallbackHandler):
         *,
         track_token_usage: bool = True,
         flush_threshold: int = 20,
+        progress_reporter: Callable[[dict], Awaitable[None]] | None = None,
+        progress_flush_interval: float = 5.0,
     ):
         super().__init__()
         self.run_id = run_id
@@ -53,10 +55,16 @@ class RunJournal(BaseCallbackHandler):
         self._store = event_store
         self._track_tokens = track_token_usage
         self._flush_threshold = flush_threshold
+        self._progress_reporter = progress_reporter
+        self._progress_flush_interval = progress_flush_interval
 
         # Write buffer
         self._buffer: list[dict] = []
         self._pending_flush_tasks: set[asyncio.Task[None]] = set()
+        self._pending_progress_task: asyncio.Task[None] | None = None
+        self._pending_progress_delayed = False
+        self._progress_dirty = False
+        self._last_progress_flush = 0.0
 
         # Token accumulators
         self._total_input_tokens = 0
@@ -294,6 +302,8 @@ class RunJournal(BaseCallbackHandler):
                     else:
                         self._lead_agent_tokens += total_tk
 
+                    self._schedule_progress_flush()
+
         if messages:
             self._counted_message_llm_run_ids.add(str(run_id))
 
@@ -445,6 +455,8 @@ class RunJournal(BaseCallbackHandler):
             else:
                 self._lead_agent_tokens += total_tk
 
+            self._schedule_progress_flush()
+
     def set_first_human_message(self, content: str) -> None:
         """Record the first human message for convenience fields."""
         self._first_human_msg = content[:2000] if content else None
@@ -474,6 +486,14 @@ class RunJournal(BaseCallbackHandler):
         """Force flush remaining buffer. Called in worker's finally block."""
         if self._pending_flush_tasks:
             await asyncio.gather(*tuple(self._pending_flush_tasks), return_exceptions=True)
+        while self._pending_progress_task is not None and not self._pending_progress_task.done():
+            if self._pending_progress_delayed:
+                self._pending_progress_task.cancel()
+                await asyncio.gather(self._pending_progress_task, return_exceptions=True)
+                self._progress_dirty = False
+                self._pending_progress_delayed = False
+                break
+            await asyncio.gather(self._pending_progress_task, return_exceptions=True)
 
         while self._buffer:
             batch = self._buffer[: self._flush_threshold]
@@ -484,6 +504,57 @@ class RunJournal(BaseCallbackHandler):
                 self._buffer = batch + self._buffer
                 raise
 
+    def _schedule_progress_flush(self) -> None:
+        """Best-effort throttled progress snapshot for active run visibility."""
+        if self._progress_reporter is None:
+            return
+        now = time.monotonic()
+        elapsed = now - self._last_progress_flush
+        if elapsed < self._progress_flush_interval:
+            self._progress_dirty = True
+            self._schedule_delayed_progress_flush(self._progress_flush_interval - elapsed)
+            return
+        if self._pending_progress_task is not None and not self._pending_progress_task.done():
+            self._progress_dirty = True
+            return
+        try:
+            loop = asyncio.get_running_loop()
+        except RuntimeError:
+            return
+        self._progress_dirty = False
+        self._pending_progress_task = loop.create_task(self._flush_progress_async(snapshot=self.get_completion_data()))
+
+    def _schedule_delayed_progress_flush(self, delay: float) -> None:
+        if self._pending_progress_task is not None and not self._pending_progress_task.done():
+            return
+        try:
+            loop = asyncio.get_running_loop()
+        except RuntimeError:
+            return
+        delay = max(0.0, delay)
+        self._pending_progress_delayed = delay > 0
+        self._pending_progress_task = loop.create_task(self._flush_progress_async(delay=delay))
+
+    async def _flush_progress_async(self, *, snapshot: dict | None = None, delay: float = 0.0) -> None:
+        if self._progress_reporter is None:
+            return
+        if delay > 0:
+            self._pending_progress_delayed = True
+            await asyncio.sleep(delay)
+            self._pending_progress_delayed = False
+        dirty_before_write = self._progress_dirty
+        self._progress_dirty = False
+        snapshot_to_write = snapshot or self.get_completion_data()
+        try:
+            await self._progress_reporter(snapshot_to_write)
+            self._last_progress_flush = time.monotonic()
+        except Exception:
+            logger.warning("Failed to persist progress snapshot for run %s", self.run_id, exc_info=True)
+        if dirty_before_write or self._progress_dirty:
+            self._progress_dirty = False
+            self._pending_progress_task = None
+            self._schedule_delayed_progress_flush(self._progress_flush_interval)
+
     def get_completion_data(self) -> dict:
         """Return accumulated token and message data for run completion."""
         return {

backend/packages/harness/deerflow/runtime/runs/__init__.py

@@ -1,16 +1,39 @@
 """Run lifecycle management for LangGraph Platform API compatibility."""
 
+from .domain import (
+    AssistantId,
+    CancelAction,
+    DisconnectMode,
+    EventSeq,
+    InvalidRunTransition,
+    MultitaskStrategy,
+    Run,
+    RunId,
+    RunScope,
+    RunStatus,
+    ThreadId,
+    UserId,
+)
 from .manager import ConflictError, RunManager, RunRecord, UnsupportedStrategyError
-from .schemas import DisconnectMode, RunStatus
 from .worker import RunContext, run_agent
 
 __all__ = [
+    "AssistantId",
+    "CancelAction",
     "ConflictError",
     "DisconnectMode",
+    "EventSeq",
+    "InvalidRunTransition",
+    "MultitaskStrategy",
+    "Run",
     "RunContext",
+    "RunId",
     "RunManager",
     "RunRecord",
+    "RunScope",
     "RunStatus",
+    "ThreadId",
     "UnsupportedStrategyError",
+    "UserId",
     "run_agent",
 ]

backend/packages/harness/deerflow/runtime/runs/application/__init__.py

@@ -0,0 +1,20 @@
+"""Application-layer DTOs and services for run runtime use cases."""
+
+from .commands import CancelRunCommand, CreateRunCommand, JoinRunStreamCommand
+from .dto import RunMessageView, RunSnapshot, RunStreamHandle, StoredRunEvent
+from .queries import GetRunQuery, ListRunMessagesQuery, ListRunsQuery
+from .services import RunsApplicationService
+
+__all__ = [
+    "CancelRunCommand",
+    "CreateRunCommand",
+    "GetRunQuery",
+    "JoinRunStreamCommand",
+    "ListRunMessagesQuery",
+    "ListRunsQuery",
+    "RunMessageView",
+    "RunSnapshot",
+    "RunStreamHandle",
+    "RunsApplicationService",
+    "StoredRunEvent",
+]

backend/packages/harness/deerflow/runtime/runs/application/commands.py

@@ -0,0 +1,46 @@
+"""Application command DTOs for run use cases."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import Any, Literal
+
+from ..domain import AssistantId, CancelAction, DisconnectMode, MultitaskStrategy, RunId, RunScope, ThreadId
+
+
+@dataclass(frozen=True)
+class CreateRunCommand:
+    thread_id: ThreadId
+    assistant_id: AssistantId | None = None
+    input: dict[str, Any] | None = None
+    command: dict[str, Any] | None = None
+    metadata: dict[str, Any] = field(default_factory=dict)
+    config: dict[str, Any] = field(default_factory=dict)
+    context: dict[str, Any] = field(default_factory=dict)
+    scope: RunScope = RunScope.stateful
+    on_disconnect: DisconnectMode = DisconnectMode.cancel
+    multitask_strategy: MultitaskStrategy = MultitaskStrategy.reject
+    stream_mode: list[str] | str | None = None
+    stream_subgraphs: bool = False
+    interrupt_before: list[str] | Literal["*"] | None = None
+    interrupt_after: list[str] | Literal["*"] | None = None
+
+
+@dataclass(frozen=True)
+class CancelRunCommand:
+    run_id: RunId
+    action: CancelAction = CancelAction.interrupt
+    wait: bool = False
+
+
+@dataclass(frozen=True)
+class JoinRunStreamCommand:
+    run_id: RunId
+    last_event_id: str | None = None
+
+
+__all__ = [
+    "CancelRunCommand",
+    "CreateRunCommand",
+    "JoinRunStreamCommand",
+]

backend/packages/harness/deerflow/runtime/runs/application/dto.py

@@ -0,0 +1,76 @@
+"""Application output DTOs for run use cases."""
+
+from __future__ import annotations
+
+from collections.abc import AsyncIterator
+from dataclasses import dataclass, field
+from typing import Any
+
+from ..domain import AssistantId, EventSeq, Run, RunId, RunStatus, ThreadId
+
+
+@dataclass(frozen=True)
+class RunSnapshot:
+    run_id: RunId
+    thread_id: ThreadId
+    assistant_id: AssistantId | None = None
+    status: RunStatus = RunStatus.pending
+    metadata: dict[str, Any] = field(default_factory=dict)
+    kwargs: dict[str, Any] = field(default_factory=dict)
+    created_at: str = ""
+    updated_at: str = ""
+    error: str | None = None
+    model_name: str | None = None
+
+    @classmethod
+    def from_run(cls, run: Run) -> RunSnapshot:
+        return cls(
+            run_id=run.run_id,
+            thread_id=run.thread_id,
+            assistant_id=run.assistant_id,
+            status=run.status,
+            metadata=dict(run.metadata),
+            kwargs=dict(run.kwargs),
+            created_at=run.created_at,
+            updated_at=run.updated_at,
+            error=run.error,
+            model_name=run.model_name,
+        )
+
+
+@dataclass(frozen=True)
+class RunMessageView:
+    thread_id: ThreadId
+    run_id: RunId
+    seq: EventSeq
+    event_type: str
+    content: str | dict[str, Any] = ""
+    metadata: dict[str, Any] = field(default_factory=dict)
+    created_at: str = ""
+
+
+@dataclass(frozen=True)
+class StoredRunEvent:
+    thread_id: ThreadId
+    run_id: RunId
+    seq: EventSeq
+    event_type: str
+    category: str
+    content: str | dict[str, Any] = ""
+    metadata: dict[str, Any] = field(default_factory=dict)
+    created_at: str = ""
+
+
+@dataclass(frozen=True)
+class RunStreamHandle:
+    run_id: RunId
+    thread_id: ThreadId
+    events: AsyncIterator[Any]
+
+
+__all__ = [
+    "RunMessageView",
+    "RunSnapshot",
+    "RunStreamHandle",
+    "StoredRunEvent",
+]

backend/packages/harness/deerflow/runtime/runs/application/queries.py

@@ -0,0 +1,37 @@
+"""Application query DTOs for run use cases."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+
+from ..domain import RunId, ThreadId, UserId
+
+
+@dataclass(frozen=True)
+class GetRunQuery:
+    run_id: RunId
+    thread_id: ThreadId | None = None
+    user_id: UserId | None = None
+
+
+@dataclass(frozen=True)
+class ListRunsQuery:
+    thread_id: ThreadId
+    user_id: UserId | None = None
+    limit: int = 100
+
+
+@dataclass(frozen=True)
+class ListRunMessagesQuery:
+    thread_id: ThreadId
+    run_id: RunId
+    limit: int = 50
+    before_seq: int | None = None
+    after_seq: int | None = None
+
+
+__all__ = [
+    "GetRunQuery",
+    "ListRunMessagesQuery",
+    "ListRunsQuery",
+]

backend/packages/harness/deerflow/runtime/runs/application/services.py

@@ -0,0 +1,74 @@
+"""Application service skeleton for run use cases."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+
+from ..execution import RunExecutionScheduler, RunSupervisor
+from ..repositories import RunEventLog, RunRepository
+from ..streams import RunStreamBroker
+from .commands import CancelRunCommand, CreateRunCommand, JoinRunStreamCommand
+from .dto import RunMessageView, RunSnapshot, RunStreamHandle
+from .queries import GetRunQuery, ListRunMessagesQuery, ListRunsQuery
+
+
+@dataclass
+class RunsApplicationService:
+    """Use-case orchestration boundary for run runtime operations.
+
+    PR1 only introduces the boundary and dependency shape. Existing Gateway
+    handlers continue to call the legacy service functions until later PRs move
+    behavior into this class.
+    """
+
+    run_repository: RunRepository
+    run_event_log: RunEventLog
+    stream_broker: RunStreamBroker
+    scheduler: RunExecutionScheduler
+    supervisor: RunSupervisor
+
+    async def create_background(self, command: CreateRunCommand) -> RunSnapshot:
+        # PR1 defines the application boundary; later PRs move Gateway runtime
+        # behavior behind this method.
+        raise NotImplementedError("RunsApplicationService is not wired in PR1")
+
+    async def create_and_stream(self, command: CreateRunCommand) -> RunStreamHandle:
+        raise NotImplementedError("RunsApplicationService is not wired in PR1")
+
+    async def create_and_wait(self, command: CreateRunCommand) -> RunSnapshot:
+        raise NotImplementedError("RunsApplicationService is not wired in PR1")
+
+    async def join_stream(self, command: JoinRunStreamCommand) -> RunStreamHandle:
+        raise NotImplementedError("RunsApplicationService is not wired in PR1")
+
+    async def cancel(self, command: CancelRunCommand) -> bool:
+        return await self.supervisor.cancel(command.run_id, action=command.action)
+
+    async def get_run(self, query: GetRunQuery) -> RunSnapshot | None:
+        run = await self.run_repository.get(query.run_id, user_id=query.user_id)
+        if run is None:
+            return None
+        if query.thread_id is not None and run.thread_id != query.thread_id:
+            return None
+        return RunSnapshot.from_run(run)
+
+    async def list_runs(self, query: ListRunsQuery) -> list[RunSnapshot]:
+        return await self.run_repository.list_by_thread(
+            query.thread_id,
+            user_id=query.user_id,
+            limit=query.limit,
+        )
+
+    async def list_run_messages(self, query: ListRunMessagesQuery) -> list[RunMessageView]:
+        return await self.run_event_log.list_messages_by_run(
+            query.thread_id,
+            query.run_id,
+            limit=query.limit,
+            before_seq=query.before_seq,
+            after_seq=query.after_seq,
+        )
+
+
+__all__ = [
+    "RunsApplicationService",
+]

backend/packages/harness/deerflow/runtime/runs/domain/__init__.py

@@ -0,0 +1,33 @@
+"""Run runtime domain model."""
+
+from .errors import InvalidRunTransition, RunDomainError
+from .events import RunCancelled, RunCompleted, RunCreated, RunEvent, RunFailed, RunStarted
+from .identifiers import AssistantId, RunId, ThreadId, UserId
+from .model import Run
+from .policies import CancelPolicy, MultitaskDecision, MultitaskPolicy
+from .value_objects import CancelAction, DisconnectMode, EventSeq, MultitaskStrategy, RunScope, RunStatus
+
+__all__ = [
+    "AssistantId",
+    "CancelAction",
+    "CancelPolicy",
+    "DisconnectMode",
+    "EventSeq",
+    "InvalidRunTransition",
+    "MultitaskDecision",
+    "MultitaskPolicy",
+    "MultitaskStrategy",
+    "Run",
+    "RunCancelled",
+    "RunCompleted",
+    "RunCreated",
+    "RunDomainError",
+    "RunEvent",
+    "RunFailed",
+    "RunId",
+    "RunScope",
+    "RunStarted",
+    "RunStatus",
+    "ThreadId",
+    "UserId",
+]

backend/packages/harness/deerflow/runtime/runs/domain/errors.py

@@ -0,0 +1,24 @@
+"""Domain-level errors for run lifecycle operations."""
+
+from __future__ import annotations
+
+from .value_objects import RunStatus
+
+
+class RunDomainError(Exception):
+    """Base class for run runtime domain errors."""
+
+
+class InvalidRunTransition(RunDomainError):
+    """Raised when a run status transition violates lifecycle rules."""
+
+    def __init__(self, current: RunStatus, target: RunStatus) -> None:
+        super().__init__(f"Cannot transition run from {current.value!r} to {target.value!r}")
+        self.current = current
+        self.target = target
+
+
+__all__ = [
+    "InvalidRunTransition",
+    "RunDomainError",
+]

backend/packages/harness/deerflow/runtime/runs/domain/events.py

@@ -0,0 +1,64 @@
+"""Domain events emitted by the run aggregate."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import Any
+
+from deerflow.utils.time import now_iso
+
+from .identifiers import AssistantId, RunId, ThreadId
+from .value_objects import CancelAction, RunStatus
+
+
+@dataclass(frozen=True)
+class RunCreated:
+    run_id: RunId
+    thread_id: ThreadId
+    occurred_at: str = field(default_factory=now_iso)
+    assistant_id: AssistantId | None = None
+    metadata: dict[str, Any] = field(default_factory=dict)
+
+
+@dataclass(frozen=True)
+class RunStarted:
+    run_id: RunId
+    thread_id: ThreadId
+    occurred_at: str = field(default_factory=now_iso)
+
+
+@dataclass(frozen=True)
+class RunCompleted:
+    run_id: RunId
+    thread_id: ThreadId
+    occurred_at: str = field(default_factory=now_iso)
+
+
+@dataclass(frozen=True)
+class RunFailed:
+    run_id: RunId
+    thread_id: ThreadId
+    status: RunStatus
+    occurred_at: str = field(default_factory=now_iso)
+    error: str | None = None
+
+
+@dataclass(frozen=True)
+class RunCancelled:
+    run_id: RunId
+    thread_id: ThreadId
+    occurred_at: str = field(default_factory=now_iso)
+    action: CancelAction = CancelAction.interrupt
+
+
+RunEvent = RunCreated | RunStarted | RunCompleted | RunFailed | RunCancelled
+
+
+__all__ = [
+    "RunCancelled",
+    "RunCompleted",
+    "RunCreated",
+    "RunEvent",
+    "RunFailed",
+    "RunStarted",
+]

backend/packages/harness/deerflow/runtime/runs/domain/identifiers.py

@@ -0,0 +1,27 @@
+"""Lightweight identifiers for the run runtime domain."""
+
+from __future__ import annotations
+
+from typing import NewType
+
+RunId = NewType("RunId", str)
+ThreadId = NewType("ThreadId", str)
+AssistantId = NewType("AssistantId", str)
+UserId = NewType("UserId", str)
+
+
+def require_non_empty(value: str, *, field_name: str) -> str:
+    """Return a stripped identifier value, rejecting empty identifiers."""
+    normalized = value.strip()
+    if not normalized:
+        raise ValueError(f"{field_name} must not be empty")
+    return normalized
+
+
+__all__ = [
+    "AssistantId",
+    "RunId",
+    "ThreadId",
+    "UserId",
+    "require_non_empty",
+]

backend/packages/harness/deerflow/runtime/runs/domain/model.py

@@ -0,0 +1,193 @@
+"""Run aggregate root and lifecycle invariants."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass, field
+from typing import Any
+
+from deerflow.utils.time import now_iso
+
+from .errors import InvalidRunTransition
+from .events import RunCancelled, RunCompleted, RunCreated, RunEvent, RunFailed, RunStarted
+from .identifiers import AssistantId, RunId, ThreadId, require_non_empty
+from .value_objects import CancelAction, MultitaskStrategy, RunScope, RunStatus
+
+# Keep lifecycle transitions explicit so later application code cannot invent
+# ad hoc status moves outside the aggregate.
+_ALLOWED_TRANSITIONS: dict[RunStatus, frozenset[RunStatus]] = {
+    RunStatus.pending: frozenset(
+        {
+            RunStatus.running,
+            RunStatus.error,
+            RunStatus.timeout,
+            RunStatus.interrupted,
+        }
+    ),
+    RunStatus.running: frozenset(
+        {
+            RunStatus.success,
+            RunStatus.error,
+            RunStatus.timeout,
+            RunStatus.interrupted,
+        }
+    ),
+    RunStatus.success: frozenset(),
+    RunStatus.error: frozenset(),
+    RunStatus.timeout: frozenset(),
+    RunStatus.interrupted: frozenset(),
+}
+
+
+@dataclass
+class Run:
+    """Run aggregate root.
+
+    The aggregate owns lifecycle invariants only. Infrastructure concerns such
+    as SQL sessions, SSE frames, Redis clients, and FastAPI requests stay out of
+    this model.
+    """
+
+    run_id: RunId
+    thread_id: ThreadId
+    status: RunStatus
+    assistant_id: AssistantId | None = None
+    scope: RunScope = RunScope.stateful
+    multitask_strategy: MultitaskStrategy = MultitaskStrategy.reject
+    metadata: dict[str, Any] = field(default_factory=dict)
+    kwargs: dict[str, Any] = field(default_factory=dict)
+    created_at: str = field(default_factory=now_iso)
+    updated_at: str = field(default_factory=now_iso)
+    error: str | None = None
+    model_name: str | None = None
+    _pending_events: list[RunEvent] = field(default_factory=list, init=False, repr=False)
+
+    def __post_init__(self) -> None:
+        self.run_id = RunId(require_non_empty(str(self.run_id), field_name="run_id"))
+        self.thread_id = ThreadId(require_non_empty(str(self.thread_id), field_name="thread_id"))
+        if self.assistant_id is not None:
+            self.assistant_id = AssistantId(require_non_empty(str(self.assistant_id), field_name="assistant_id"))
+
+    @classmethod
+    def create(
+        cls,
+        *,
+        run_id: RunId,
+        thread_id: ThreadId,
+        assistant_id: AssistantId | None = None,
+        scope: RunScope = RunScope.stateful,
+        multitask_strategy: MultitaskStrategy = MultitaskStrategy.reject,
+        metadata: dict[str, Any] | None = None,
+        kwargs: dict[str, Any] | None = None,
+        model_name: str | None = None,
+        created_at: str | None = None,
+    ) -> Run:
+        timestamp = created_at or now_iso()
+        run = cls(
+            run_id=run_id,
+            thread_id=thread_id,
+            assistant_id=assistant_id,
+            status=RunStatus.pending,
+            scope=scope,
+            multitask_strategy=multitask_strategy,
+            metadata=metadata or {},
+            kwargs=kwargs or {},
+            created_at=timestamp,
+            updated_at=timestamp,
+            model_name=model_name,
+        )
+        run._record_event(
+            RunCreated(
+                run_id=run.run_id,
+                thread_id=run.thread_id,
+                occurred_at=timestamp,
+                assistant_id=run.assistant_id,
+                metadata=dict(run.metadata),
+            )
+        )
+        return run
+
+    @property
+    def is_terminal(self) -> bool:
+        return not _ALLOWED_TRANSITIONS[self.status]
+
+    def pull_events(self) -> tuple[RunEvent, ...]:
+        # Domain events are drained by the application layer after the aggregate
+        # has accepted a state change.
+        events = tuple(self._pending_events)
+        self._pending_events.clear()
+        return events
+
+    def mark_started(self, *, at: str | None = None) -> None:
+        self._transition_to(RunStatus.running, at=at)
+
+    def mark_completed(self, *, at: str | None = None) -> None:
+        self._transition_to(RunStatus.success, at=at)
+
+    def mark_failed(self, error: str | None = None, *, at: str | None = None) -> None:
+        self._transition_to(RunStatus.error, error=error, at=at)
+
+    def mark_timed_out(self, error: str | None = None, *, at: str | None = None) -> None:
+        self._transition_to(RunStatus.timeout, error=error, at=at)
+
+    def mark_cancelled(self, *, action: CancelAction = CancelAction.interrupt, at: str | None = None) -> None:
+        self._transition_to(RunStatus.interrupted, action=action, at=at)
+
+    def _transition_to(
+        self,
+        target: RunStatus,
+        *,
+        error: str | None = None,
+        action: CancelAction = CancelAction.interrupt,
+        at: str | None = None,
+    ) -> None:
+        if target == self.status:
+            return
+        if target not in _ALLOWED_TRANSITIONS[self.status]:
+            raise InvalidRunTransition(self.status, target)
+
+        timestamp = at or now_iso()
+        self.status = target
+        self.updated_at = timestamp
+        if error is not None:
+            self.error = error
+        self._record_event(self._event_for_transition(target, timestamp, error=error, action=action))
+
+    def _event_for_transition(
+        self,
+        target: RunStatus,
+        occurred_at: str,
+        *,
+        error: str | None,
+        action: CancelAction,
+    ) -> RunEvent:
+        # Keep event construction next to the transition rules so a new status
+        # cannot be added without an explicit durable event shape.
+        if target == RunStatus.running:
+            return RunStarted(run_id=self.run_id, thread_id=self.thread_id, occurred_at=occurred_at)
+        if target == RunStatus.success:
+            return RunCompleted(run_id=self.run_id, thread_id=self.thread_id, occurred_at=occurred_at)
+        if target in (RunStatus.error, RunStatus.timeout):
+            return RunFailed(
+                run_id=self.run_id,
+                thread_id=self.thread_id,
+                status=target,
+                occurred_at=occurred_at,
+                error=error,
+            )
+        if target == RunStatus.interrupted:
+            return RunCancelled(
+                run_id=self.run_id,
+                thread_id=self.thread_id,
+                occurred_at=occurred_at,
+                action=action,
+            )
+        raise InvalidRunTransition(self.status, target)
+
+    def _record_event(self, event: RunEvent) -> None:
+        self._pending_events.append(event)
+
+
+__all__ = [
+    "Run",
+    "RunStatus",
+]

backend/packages/harness/deerflow/runtime/runs/domain/policies.py

@@ -0,0 +1,50 @@
+"""Domain policies for run concurrency and cancellation."""
+
+from __future__ import annotations
+
+from collections.abc import Sequence
+from dataclasses import dataclass
+from enum import StrEnum
+
+from .model import Run
+from .value_objects import CancelAction, MultitaskStrategy, RunStatus
+
+
+class MultitaskDecision(StrEnum):
+    """Application-level decision produced by a multitask policy."""
+
+    allow = "allow"
+    reject = "reject"
+    cancel_existing = "cancel_existing"
+    enqueue = "enqueue"
+
+
+@dataclass(frozen=True)
+class MultitaskPolicy:
+    strategy: MultitaskStrategy = MultitaskStrategy.reject
+
+    def decide(self, active_runs: Sequence[Run]) -> MultitaskDecision:
+        inflight = [run for run in active_runs if run.status in (RunStatus.pending, RunStatus.running)]
+        if not inflight:
+            return MultitaskDecision.allow
+        if self.strategy == MultitaskStrategy.reject:
+            return MultitaskDecision.reject
+        if self.strategy in (MultitaskStrategy.interrupt, MultitaskStrategy.rollback):
+            return MultitaskDecision.cancel_existing
+        return MultitaskDecision.enqueue
+
+
+@dataclass(frozen=True)
+class CancelPolicy:
+    action: CancelAction = CancelAction.interrupt
+
+    @property
+    def rolls_back_checkpoint(self) -> bool:
+        return self.action == CancelAction.rollback
+
+
+__all__ = [
+    "CancelPolicy",
+    "MultitaskDecision",
+    "MultitaskPolicy",
+]

backend/packages/harness/deerflow/runtime/runs/domain/value_objects.py

@@ -0,0 +1,88 @@
+"""Domain value objects for run lifecycle semantics."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+from enum import StrEnum
+
+
+class RunStatus(StrEnum):
+    """Lifecycle status of a single run."""
+
+    pending = "pending"
+    running = "running"
+    success = "success"
+    error = "error"
+    timeout = "timeout"
+    interrupted = "interrupted"
+
+
+class DisconnectMode(StrEnum):
+    """Behaviour when the SSE consumer disconnects."""
+
+    cancel = "cancel"
+    continue_ = "continue"
+
+
+class RunScope(StrEnum):
+    """Conversation scope for a run."""
+
+    stateful = "stateful"
+    stateless = "stateless"
+    temporary_thread = "temporary_thread"
+
+
+class MultitaskStrategy(StrEnum):
+    """Concurrency strategy for a new run on a thread."""
+
+    reject = "reject"
+    interrupt = "interrupt"
+    rollback = "rollback"
+    enqueue = "enqueue"
+
+
+class CancelAction(StrEnum):
+    """Cancellation action requested by an API or supervisor."""
+
+    interrupt = "interrupt"
+    rollback = "rollback"
+
+
+TERMINAL_RUN_STATUSES: frozenset[RunStatus] = frozenset(
+    {
+        RunStatus.success,
+        RunStatus.error,
+        RunStatus.timeout,
+        RunStatus.interrupted,
+    }
+)
+
+
+def is_terminal_status(status: RunStatus) -> bool:
+    return status in TERMINAL_RUN_STATUSES
+
+
+@dataclass(frozen=True, order=True)
+class EventSeq:
+    """Thread-local event sequence number."""
+
+    value: int
+
+    def __post_init__(self) -> None:
+        if self.value < 0:
+            raise ValueError("EventSeq must be non-negative")
+
+    def next(self) -> EventSeq:
+        return EventSeq(self.value + 1)
+
+
+__all__ = [
+    "CancelAction",
+    "DisconnectMode",
+    "EventSeq",
+    "MultitaskStrategy",
+    "RunScope",
+    "RunStatus",
+    "TERMINAL_RUN_STATUSES",
+    "is_terminal_status",
+]

backend/packages/harness/deerflow/runtime/runs/execution/__init__.py

@@ -0,0 +1,12 @@
+"""Execution contracts for run lifecycle orchestration."""
+
+from .executor import RunExecutor
+from .scheduler import RunExecutionHandle, RunExecutionScheduler
+from .supervisor import RunSupervisor
+
+__all__ = [
+    "RunExecutionHandle",
+    "RunExecutionScheduler",
+    "RunExecutor",
+    "RunSupervisor",
+]

backend/packages/harness/deerflow/runtime/runs/execution/executor.py

@@ -0,0 +1,19 @@
+"""Run executor contract."""
+
+from __future__ import annotations
+
+from typing import Protocol
+
+from ..domain import Run
+
+
+class RunExecutor(Protocol):
+    """Executes one run against the underlying agent or graph runtime."""
+
+    async def execute(self, run: Run) -> None:
+        pass
+
+
+__all__ = [
+    "RunExecutor",
+]

backend/packages/harness/deerflow/runtime/runs/execution/scheduler.py

@@ -0,0 +1,26 @@
+"""Run execution scheduler contract."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+from typing import Protocol
+
+from ..domain import RunId
+
+
+@dataclass(frozen=True)
+class RunExecutionHandle:
+    run_id: RunId
+
+
+class RunExecutionScheduler(Protocol):
+    """Starts background execution for an accepted run."""
+
+    async def start(self, run_id: RunId) -> RunExecutionHandle:
+        pass
+
+
+__all__ = [
+    "RunExecutionHandle",
+    "RunExecutionScheduler",
+]

backend/packages/harness/deerflow/runtime/runs/execution/supervisor.py

@@ -0,0 +1,19 @@
+"""Run execution supervision contract."""
+
+from __future__ import annotations
+
+from typing import Protocol
+
+from ..domain import CancelAction, RunId
+
+
+class RunSupervisor(Protocol):
+    """Controls lifecycle operations for already scheduled runs."""
+
+    async def cancel(self, run_id: RunId, *, action: CancelAction = CancelAction.interrupt) -> bool:
+        pass
+
+
+__all__ = [
+    "RunSupervisor",
+]

backend/packages/harness/deerflow/runtime/runs/manager.py

@@ -4,9 +4,11 @@ from __future__ import annotations
 
 import asyncio
 import logging
+import sqlite3
 import uuid
+from collections.abc import Awaitable, Callable
 from dataclasses import dataclass, field
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Any
 
 from deerflow.utils.time import now_iso as _now_iso
 
@@ -17,6 +19,57 @@ if TYPE_CHECKING:
 
 logger = logging.getLogger(__name__)
 
+_RETRYABLE_SQLITE_MESSAGES = (
+    "database is locked",
+    "database table is locked",
+    "database is busy",
+)
+
+_RETRYABLE_SQLITE_ERROR_CODES = {
+    sqlite3.SQLITE_BUSY,
+    sqlite3.SQLITE_LOCKED,
+}
+
+
+def _is_retryable_persistence_error(exc: BaseException) -> bool:
+    """Return True for transient SQLite persistence failures.
+
+    SQLite lock contention normally surfaces through either sqlite3 exceptions
+    or SQLAlchemy wrappers.  The short bounded retry here protects run status
+    finalization from transient writer pressure without hiding permanent
+    failures forever.
+    """
+
+    pending: list[BaseException] = [exc]
+    seen: set[int] = set()
+    while pending:
+        current = pending.pop()
+        if id(current) in seen:
+            continue
+        seen.add(id(current))
+
+        message = str(current).lower()
+        if any(fragment in message for fragment in _RETRYABLE_SQLITE_MESSAGES):
+            return True
+        if isinstance(current, (sqlite3.OperationalError, sqlite3.DatabaseError)):
+            error_code = getattr(current, "sqlite_errorcode", None)
+            if error_code in _RETRYABLE_SQLITE_ERROR_CODES:
+                return True
+        for chained in (getattr(current, "orig", None), current.__cause__, current.__context__):
+            if isinstance(chained, BaseException):
+                pending.append(chained)
+    return False
+
+
+@dataclass(frozen=True)
+class PersistenceRetryPolicy:
+    """Bounded retry policy for short run-store writes."""
+
+    max_attempts: int = 5
+    initial_delay: float = 0.05
+    max_delay: float = 1.0
+    backoff_factor: float = 2.0
+
 
 @dataclass
 class RunRecord:
@@ -37,6 +90,17 @@ class RunRecord:
     abort_action: str = "interrupt"
     error: str | None = None
     model_name: str | None = None
+    store_only: bool = False
+    total_input_tokens: int = 0
+    total_output_tokens: int = 0
+    total_tokens: int = 0
+    llm_call_count: int = 0
+    lead_agent_tokens: int = 0
+    subagent_tokens: int = 0
+    middleware_tokens: int = 0
+    message_count: int = 0
+    last_ai_message: str | None = None
+    first_human_message: str | None = None
 
 
 class RunManager:
@@ -47,37 +111,205 @@ class RunManager:
     that run history survives process restarts.
     """
 
-    def __init__(self, store: RunStore | None = None) -> None:
+    def __init__(
+        self,
+        store: RunStore | None = None,
+        *,
+        persistence_retry_policy: PersistenceRetryPolicy | None = None,
+    ) -> None:
         self._runs: dict[str, RunRecord] = {}
         self._lock = asyncio.Lock()
         self._store = store
+        self._persistence_retry_policy = persistence_retry_policy or PersistenceRetryPolicy()
 
-    async def _persist_to_store(self, record: RunRecord) -> None:
+    @staticmethod
-        """Best-effort persist run record to backing store."""
+    def _store_put_payload(record: RunRecord, *, error: str | None = None) -> dict[str, Any]:
+        return {
+            "thread_id": record.thread_id,
+            "assistant_id": record.assistant_id,
+            "status": record.status.value,
+            "multitask_strategy": record.multitask_strategy,
+            "metadata": record.metadata or {},
+            "kwargs": record.kwargs or {},
+            "error": error if error is not None else record.error,
+            "created_at": record.created_at,
+            "model_name": record.model_name,
+        }
+
+    async def _call_store_with_retry(
+        self,
+        operation_name: str,
+        run_id: str,
+        operation: Callable[[], Awaitable[Any]],
+    ) -> Any:
+        """Run a short store operation with bounded retries for SQLite pressure."""
+        policy = self._persistence_retry_policy
+        attempt = 1
+        delay = policy.initial_delay
+        while True:
+            try:
+                return await operation()
+            except Exception as exc:
+                retryable = _is_retryable_persistence_error(exc)
+                if attempt >= policy.max_attempts or not retryable:
+                    raise
+                logger.warning(
+                    "Transient persistence failure during %s for run %s (attempt %d/%d); retrying",
+                    operation_name,
+                    run_id,
+                    attempt,
+                    policy.max_attempts,
+                    exc_info=True,
+                )
+                if delay > 0:
+                    await asyncio.sleep(delay)
+                delay = min(policy.max_delay, delay * policy.backoff_factor if delay else policy.initial_delay)
+                attempt += 1
+
+    async def _persist_snapshot_to_store(self, run_id: str, payload: dict[str, Any]) -> bool:
+        """Best-effort persist a previously captured run snapshot."""
+        if self._store is None:
+            return True
+        try:
+            await self._call_store_with_retry(
+                "put",
+                run_id,
+                lambda: self._store.put(run_id, **payload),
+            )
+            return True
+        except Exception:
+            logger.warning("Failed to persist run %s to store", run_id, exc_info=True)
+            return False
+
+    async def _persist_new_run_to_store(self, record: RunRecord) -> None:
+        """Persist a newly created run record to the backing store.
+
+        Initial run creation is part of the run visibility boundary: callers
+        should not observe a run in memory unless its backing store row exists.
+        Unlike follow-up status/model updates, failures are propagated so the
+        caller can treat creation as failed. Rollback is the caller's
+        responsibility after inserting the record into ``_runs``.
+        """
         if self._store is None:
             return
+        await self._call_store_with_retry(
+            "put",
+            record.run_id,
+            lambda: self._store.put(record.run_id, **self._store_put_payload(record)),
+        )
+
+    async def _persist_to_store(self, record: RunRecord, *, error: str | None = None) -> bool:
+        """Best-effort persist run record to backing store."""
+        return await self._persist_snapshot_to_store(
+            record.run_id,
+            self._store_put_payload(record, error=error),
+        )
+
+    async def _persist_status(self, record: RunRecord, status: RunStatus, *, error: str | None = None) -> bool:
+        """Best-effort persist a status transition to the backing store."""
+        if self._store is None:
+            return True
+        row_recovery_payload = self._store_put_payload(record, error=error)
         try:
-            await self._store.put(
+            updated = await self._call_store_with_retry(
+                "update_status",
                 record.run_id,
-                thread_id=record.thread_id,
+                lambda: self._store.update_status(record.run_id, status.value, error=error),
-                assistant_id=record.assistant_id,
-                status=record.status.value,
-                multitask_strategy=record.multitask_strategy,
-                metadata=record.metadata or {},
-                kwargs=record.kwargs or {},
-                created_at=record.created_at,
-                model_name=record.model_name,
             )
+            if updated is False:
+                return await self._persist_snapshot_to_store(record.run_id, row_recovery_payload)
+            return True
         except Exception:
-            logger.warning("Failed to persist run %s to store", record.run_id, exc_info=True)
+            logger.warning("Failed to persist status update for run %s", record.run_id, exc_info=True)
+            return False
+
+    @staticmethod
+    def _record_from_store(row: dict[str, Any]) -> RunRecord:
+        """Build a read-only runtime record from a serialized store row.
+
+        NULL status/on_disconnect columns (e.g. from rows written before those
+        columns were added) default to ``pending`` and ``cancel`` respectively.
+        """
+        return RunRecord(
+            run_id=row["run_id"],
+            thread_id=row["thread_id"],
+            assistant_id=row.get("assistant_id"),
+            status=RunStatus(row.get("status") or RunStatus.pending.value),
+            on_disconnect=DisconnectMode(row.get("on_disconnect") or DisconnectMode.cancel.value),
+            multitask_strategy=row.get("multitask_strategy") or "reject",
+            metadata=row.get("metadata") or {},
+            kwargs=row.get("kwargs") or {},
+            created_at=row.get("created_at") or "",
+            updated_at=row.get("updated_at") or "",
+            error=row.get("error"),
+            model_name=row.get("model_name"),
+            store_only=True,
+            total_input_tokens=row.get("total_input_tokens") or 0,
+            total_output_tokens=row.get("total_output_tokens") or 0,
+            total_tokens=row.get("total_tokens") or 0,
+            llm_call_count=row.get("llm_call_count") or 0,
+            lead_agent_tokens=row.get("lead_agent_tokens") or 0,
+            subagent_tokens=row.get("subagent_tokens") or 0,
+            middleware_tokens=row.get("middleware_tokens") or 0,
+            message_count=row.get("message_count") or 0,
+            last_ai_message=row.get("last_ai_message"),
+            first_human_message=row.get("first_human_message"),
+        )
 
     async def update_run_completion(self, run_id: str, **kwargs) -> None:
         """Persist token usage and completion data to the backing store."""
-        if self._store is not None:
+        row_recovery_payload: dict[str, Any] | None = None
+        async with self._lock:
+            record = self._runs.get(run_id)
+            if record is not None:
+                for key, value in kwargs.items():
+                    if key == "status":
+                        continue
+                    if hasattr(record, key) and value is not None:
+                        setattr(record, key, value)
+                record.updated_at = _now_iso()
+                row_recovery_payload = self._store_put_payload(record, error=kwargs.get("error"))
+        if self._store is None:
+            return
+        try:
+            updated = await self._call_store_with_retry(
+                "update_run_completion",
+                run_id,
+                lambda: self._store.update_run_completion(run_id, **kwargs),
+            )
+            if updated is False:
+                if row_recovery_payload is None:
+                    logger.warning("Failed to recreate missing run %s for completion persistence", run_id)
+                    return
+                if not await self._persist_snapshot_to_store(run_id, row_recovery_payload):
+                    return
+                recovered = await self._call_store_with_retry(
+                    "update_run_completion",
+                    run_id,
+                    lambda: self._store.update_run_completion(run_id, **kwargs),
+                )
+                if recovered is False:
+                    logger.warning("Run completion update for %s affected no rows after row recreation", run_id)
+        except Exception:
+            logger.warning("Failed to persist run completion for %s", run_id, exc_info=True)
+
+    async def update_run_progress(self, run_id: str, **kwargs) -> None:
+        """Persist a running token/message snapshot without changing status."""
+        should_persist = True
+        async with self._lock:
+            record = self._runs.get(run_id)
+            if record is not None:
+                should_persist = record.status == RunStatus.running
+            if record is not None and should_persist:
+                for key, value in kwargs.items():
+                    if hasattr(record, key) and value is not None:
+                        setattr(record, key, value)
+                record.updated_at = _now_iso()
+        if should_persist and self._store is not None:
             try:
-                await self._store.update_run_completion(run_id, **kwargs)
+                await self._store.update_run_progress(run_id, **kwargs)
             except Exception:
-                logger.warning("Failed to persist run completion for %s", run_id, exc_info=True)
+                logger.warning("Failed to persist run progress for %s", run_id, exc_info=True)
 
     async def create(
         self,
@@ -106,20 +338,91 @@ class RunManager:
         )
         async with self._lock:
             self._runs[run_id] = record
-        await self._persist_to_store(record)
+            persisted = False
+            try:
+                await self._persist_new_run_to_store(record)
+                persisted = True
+            except Exception:
+                logger.warning("Failed to persist run %s; rolled back in-memory record", run_id, exc_info=True)
+                raise
+            finally:
+                # Also covers cancellation, which bypasses ``except Exception``.
+                if not persisted:
+                    self._runs.pop(run_id, None)
         logger.info("Run created: run_id=%s thread_id=%s", run_id, thread_id)
         return record
 
-    def get(self, run_id: str) -> RunRecord | None:
+    async def get(self, run_id: str, *, user_id: str | None = None) -> RunRecord | None:
-        """Return a run record by ID, or ``None``."""
+        """Return a run record by ID, or ``None``.
-        return self._runs.get(run_id)
 
-    async def list_by_thread(self, thread_id: str) -> list[RunRecord]:
+        Args:
-        """Return all runs for a given thread, newest first."""
+            run_id: The run ID to look up.
+            user_id: Optional user ID for permission filtering when hydrating from store.
+        """
         async with self._lock:
-            # Dict insertion order matches creation order, so reversing it gives
+            record = self._runs.get(run_id)
-            # us deterministic newest-first results even when timestamps tie.
+        if record is not None:
-            return [r for r in self._runs.values() if r.thread_id == thread_id]
+            return record
+        if self._store is None:
+            return None
+        try:
+            row = await self._store.get(run_id, user_id=user_id)
+        except Exception:
+            logger.warning("Failed to hydrate run %s from store", run_id, exc_info=True)
+            return None
+        # Re-check after store await: a concurrent create() may have inserted the
+        # in-memory record while the store call was in flight.
+        async with self._lock:
+            record = self._runs.get(run_id)
+        if record is not None:
+            return record
+        if row is None:
+            return None
+        try:
+            return self._record_from_store(row)
+        except Exception:
+            logger.warning("Failed to map store row for run %s", run_id, exc_info=True)
+            return None
+
+    async def aget(self, run_id: str, *, user_id: str | None = None) -> RunRecord | None:
+        """Return a run record by ID, checking the persistent store as fallback.
+
+        Alias for :meth:`get` for backward compatibility.
+        """
+        return await self.get(run_id, user_id=user_id)
+
+    async def list_by_thread(self, thread_id: str, *, user_id: str | None = None, limit: int = 100) -> list[RunRecord]:
+        """Return runs for a given thread, newest first, at most ``limit`` records.
+
+        In-memory runs take precedence only when the same ``run_id`` exists in both
+        memory and the backing store. The merged result is then sorted newest-first
+        by ``created_at`` and trimmed to ``limit`` (default 100).
+
+        Args:
+            thread_id: The thread ID to filter by.
+            user_id: Optional user ID for permission filtering when hydrating from store.
+            limit: Maximum number of runs to return.
+        """
+        async with self._lock:
+            # Dict insertion order gives deterministic results when timestamps tie.
+            memory_records = [r for r in self._runs.values() if r.thread_id == thread_id]
+        if self._store is None:
+            return sorted(memory_records, key=lambda r: r.created_at, reverse=True)[:limit]
+        records_by_id = {record.run_id: record for record in memory_records}
+        store_limit = max(0, limit - len(memory_records))
+        try:
+            rows = await self._store.list_by_thread(thread_id, user_id=user_id, limit=store_limit)
+        except Exception:
+            logger.warning("Failed to hydrate runs for thread %s from store", thread_id, exc_info=True)
+            return sorted(memory_records, key=lambda r: r.created_at, reverse=True)[:limit]
+        for row in rows:
+            run_id = row.get("run_id")
+            if run_id and run_id not in records_by_id:
+                try:
+                    records_by_id[run_id] = self._record_from_store(row)
+                except Exception:
+                    logger.warning("Failed to map store row for run %s", run_id, exc_info=True)
+        return sorted(records_by_id.values(), key=lambda record: record.created_at, reverse=True)[:limit]
 
     async def set_status(self, run_id: str, status: RunStatus, *, error: str | None = None) -> None:
         """Transition a run to a new status."""
@@ -132,13 +435,22 @@ class RunManager:
             record.updated_at = _now_iso()
             if error is not None:
                 record.error = error
-        if self._store is not None:
+        await self._persist_status(record, status, error=error)
-            try:
-                await self._store.update_status(run_id, status.value, error=error)
-            except Exception:
-                logger.warning("Failed to persist status update for run %s", run_id, exc_info=True)
         logger.info("Run %s -> %s", run_id, status.value)
 
+    async def _persist_model_name(self, run_id: str, model_name: str | None) -> None:
+        """Best-effort persist model_name update to the backing store."""
+        if self._store is None:
+            return
+        try:
+            await self._call_store_with_retry(
+                "update_model_name",
+                run_id,
+                lambda: self._store.update_model_name(run_id, model_name),
+            )
+        except Exception:
+            logger.warning("Failed to persist model_name update for run %s", run_id, exc_info=True)
+
     async def update_model_name(self, run_id: str, model_name: str | None) -> None:
         """Update the model name for a run."""
         async with self._lock:
@@ -148,7 +460,7 @@ class RunManager:
                 return
             record.model_name = model_name
             record.updated_at = _now_iso()
-        await self._persist_to_store(record)
+        await self._persist_model_name(run_id, model_name)
         logger.info("Run %s model_name=%s", run_id, model_name)
 
     async def cancel(self, run_id: str, *, action: str = "interrupt") -> bool:
@@ -159,12 +471,17 @@ class RunManager:
             action: "interrupt" keeps checkpoint, "rollback" reverts to pre-run state.
 
         Sets the abort event with the action reason and cancels the asyncio task.
-        Returns ``True`` if the run was in-flight and cancellation was initiated.
+        Returns ``True`` if cancellation was initiated **or** the run was already
+        interrupted (idempotent — a second cancel is a no-op success).
+        Returns ``False`` only when the run is unknown to this worker or has
+        reached a terminal state other than interrupted (completed, failed, etc.).
         """
         async with self._lock:
             record = self._runs.get(run_id)
             if record is None:
                 return False
+            if record.status == RunStatus.interrupted:
+                return True  # idempotent — already cancelled on this worker
             if record.status not in (RunStatus.pending, RunStatus.running):
                 return False
             record.abort_action = action
@@ -173,6 +490,7 @@ class RunManager:
                 record.task.cancel()
             record.status = RunStatus.interrupted
             record.updated_at = _now_iso()
+        await self._persist_status(record, RunStatus.interrupted)
         logger.info("Run %s cancelled (action=%s)", run_id, action)
         return True
 
@@ -200,6 +518,7 @@ class RunManager:
         now = _now_iso()
 
         _supported_strategies = ("reject", "interrupt", "rollback")
+        interrupted_records: list[RunRecord] = []
 
         async with self._lock:
             if multitask_strategy not in _supported_strategies:
@@ -211,15 +530,8 @@ class RunManager:
                 raise ConflictError(f"Thread {thread_id} already has an active run")
 
             if multitask_strategy in ("interrupt", "rollback") and inflight:
-                for r in inflight:
-                    r.abort_action = multitask_strategy
-                    r.abort_event.set()
-                    if r.task is not None and not r.task.done():
-                        r.task.cancel()
-                    r.status = RunStatus.interrupted
-                    r.updated_at = now
                 logger.info(
-                    "Cancelled %d inflight run(s) on thread %s (strategy=%s)",
+                    "Preparing to cancel %d inflight run(s) on thread %s (strategy=%s)",
                     len(inflight),
                     thread_id,
                     multitask_strategy,
@@ -239,11 +551,87 @@ class RunManager:
                 model_name=model_name,
             )
             self._runs[run_id] = record
+            persisted = False
+            try:
+                await self._persist_new_run_to_store(record)
+                persisted = True
+            except Exception:
+                logger.warning("Failed to persist run %s; rolled back in-memory record", run_id, exc_info=True)
+                raise
+            finally:
+                # Also covers cancellation, which bypasses ``except Exception``.
+                if not persisted:
+                    self._runs.pop(run_id, None)
 
-        await self._persist_to_store(record)
+            if multitask_strategy in ("interrupt", "rollback") and inflight:
+                for r in inflight:
+                    r.abort_action = multitask_strategy
+                    r.abort_event.set()
+                    if r.task is not None and not r.task.done():
+                        r.task.cancel()
+                    r.status = RunStatus.interrupted
+                    r.updated_at = now
+                    interrupted_records.append(r)
+
+        for interrupted_record in interrupted_records:
+            await self._persist_status(interrupted_record, RunStatus.interrupted)
         logger.info("Run created: run_id=%s thread_id=%s", run_id, thread_id)
         return record
 
+    async def reconcile_orphaned_inflight_runs(
+        self,
+        *,
+        error: str,
+        before: str | None = None,
+    ) -> list[RunRecord]:
+        """Mark persisted active runs as failed when no local task owns them.
+
+        Gateway runs are process-local: the asyncio task and abort event live in
+        memory, while the run row is durable.  After a SQLite-backed gateway
+        restart, any persisted ``pending`` or ``running`` row created before
+        startup cannot still have a local worker.  This recovery step turns that
+        ambiguous state into an explicit error instead of letting the UI show an
+        indefinite active run.
+        """
+        if self._store is None:
+            return []
+        try:
+            rows = await self._call_store_with_retry(
+                "list_inflight",
+                "*",
+                lambda: self._store.list_inflight(before=before),
+            )
+        except Exception:
+            logger.warning("Failed to list orphaned inflight runs for reconciliation", exc_info=True)
+            return []
+
+        recovered: list[RunRecord] = []
+        now = _now_iso()
+        for row in rows:
+            try:
+                record = self._record_from_store(row)
+            except Exception:
+                logger.warning("Failed to map orphaned run row during reconciliation", exc_info=True)
+                continue
+
+            async with self._lock:
+                live_record = self._runs.get(record.run_id)
+                if live_record is not None and live_record.status in (RunStatus.pending, RunStatus.running):
+                    continue
+
+            record.status = RunStatus.error
+            record.error = error
+            record.updated_at = now
+            persisted = await self._persist_status(record, RunStatus.error, error=error)
+            if not persisted:
+                logger.warning("Skipped orphaned run %s recovery because error status was not persisted", record.run_id)
+                continue
+            recovered.append(record)
+
+        if recovered:
+            logger.warning("Recovered %d orphaned inflight run(s) as error", len(recovered))
+        return recovered
+
     async def has_inflight(self, thread_id: str) -> bool:
         """Return ``True`` if *thread_id* has a pending or running run."""
         async with self._lock:

backend/packages/harness/deerflow/runtime/runs/naming.py

@@ -0,0 +1,16 @@
+"""Run naming helpers for LangChain/LangSmith tracing."""
+
+from __future__ import annotations
+
+from collections.abc import Mapping
+from typing import Any
+
+
+def resolve_root_run_name(config: Mapping[str, Any], assistant_id: str | None) -> str:
+    for container_name in ("context", "configurable"):
+        container = config.get(container_name)
+        if isinstance(container, Mapping):
+            agent_name = container.get("agent_name")
+            if isinstance(agent_name, str) and agent_name.strip():
+                return agent_name
+    return assistant_id or "lead_agent"

backend/packages/harness/deerflow/runtime/runs/repositories/__init__.py

@@ -0,0 +1,9 @@
+"""Repository contracts for the run runtime application layer."""
+
+from .run_event_log import RunEventLog
+from .run_repository import RunRepository
+
+__all__ = [
+    "RunEventLog",
+    "RunRepository",
+]

backend/packages/harness/deerflow/runtime/runs/repositories/run_event_log.py

@@ -0,0 +1,42 @@
+"""Durable run event log contract."""
+
+from __future__ import annotations
+
+from typing import TYPE_CHECKING, Protocol
+
+from ..domain import RunEvent, RunId, ThreadId
+
+if TYPE_CHECKING:
+    from ..application.dto import RunMessageView, StoredRunEvent
+
+
+class RunEventLog(Protocol):
+    """Persistence boundary for run messages and execution trace events."""
+
+    async def append(self, events: list[RunEvent]) -> list[StoredRunEvent]:
+        pass
+
+    async def list_messages_by_run(
+        self,
+        thread_id: ThreadId,
+        run_id: RunId,
+        *,
+        limit: int = 50,
+        before_seq: int | None = None,
+        after_seq: int | None = None,
+    ) -> list[RunMessageView]:
+        pass
+
+    async def list_events_by_run(
+        self,
+        thread_id: ThreadId,
+        run_id: RunId,
+        *,
+        limit: int = 500,
+    ) -> list[StoredRunEvent]:
+        pass
+
+
+__all__ = [
+    "RunEventLog",
+]

backend/packages/harness/deerflow/runtime/runs/repositories/run_repository.py

@@ -0,0 +1,37 @@
+"""Run state repository contract."""
+
+from __future__ import annotations
+
+from typing import TYPE_CHECKING, Protocol
+
+from ..domain import Run, RunId, ThreadId, UserId
+
+if TYPE_CHECKING:
+    from ..application.dto import RunSnapshot
+
+
+class RunRepository(Protocol):
+    """Persistence boundary for run state snapshots."""
+
+    async def save(self, run: Run) -> None:
+        pass
+
+    async def get(self, run_id: RunId, *, user_id: UserId | None = None) -> Run | None:
+        pass
+
+    async def list_by_thread(
+        self,
+        thread_id: ThreadId,
+        *,
+        user_id: UserId | None = None,
+        limit: int = 100,
+    ) -> list[RunSnapshot]:
+        pass
+
+    async def delete(self, run_id: RunId) -> bool:
+        pass
+
+
+__all__ = [
+    "RunRepository",
+]

backend/packages/harness/deerflow/runtime/runs/schemas.py

@@ -1,21 +1,10 @@
-"""Run status and disconnect mode enums."""
+"""Compatibility exports for run status and disconnect mode enums."""
 
-from enum import StrEnum
+# Existing callers import these enums from ``runs.schemas``. Re-export the
+# domain definitions until all imports move to ``runs.domain``.
+from .domain import DisconnectMode, RunStatus
 
-
+__all__ = [
-class RunStatus(StrEnum):
+    "DisconnectMode",
-    """Lifecycle status of a single run."""
+    "RunStatus",
-
+]
-    pending = "pending"
-    running = "running"
-    success = "success"
-    error = "error"
-    timeout = "timeout"
-    interrupted = "interrupted"
-
-
-class DisconnectMode(StrEnum):
-    """Behaviour when the SSE consumer disconnects."""
-
-    cancel = "cancel"
-    continue_ = "continue"

backend/packages/harness/deerflow/runtime/runs/store/base.py

@@ -34,7 +34,12 @@ class RunStore(abc.ABC):
         pass
 
     @abc.abstractmethod
-    async def get(self, run_id: str) -> dict[str, Any] | None:
+    async def get(
+        self,
+        run_id: str,
+        *,
+        user_id: str | None = None,
+    ) -> dict[str, Any] | None:
         pass
 
     @abc.abstractmethod
@@ -54,13 +59,27 @@ class RunStore(abc.ABC):
         status: str,
         *,
         error: str | None = None,
-    ) -> None:
+    ) -> bool | None:
+        """Update a run status.
+
+        Returns ``False`` when the store can prove no row was updated. Older or
+        lightweight stores may return ``None`` when they cannot report rowcount.
+        """
         pass
 
     @abc.abstractmethod
     async def delete(self, run_id: str) -> None:
         pass
 
+    @abc.abstractmethod
+    async def update_model_name(
+        self,
+        run_id: str,
+        model_name: str | None,
+    ) -> None:
+        """Update the model_name field for an existing run."""
+        pass
+
     @abc.abstractmethod
     async def update_run_completion(
         self,
@@ -78,15 +97,42 @@ class RunStore(abc.ABC):
         last_ai_message: str | None = None,
         first_human_message: str | None = None,
         error: str | None = None,
-    ) -> None:
+    ) -> bool | None:
+        """Persist final completion fields.
+
+        Returns ``False`` when the store can prove no row was updated.
+        """
         pass
 
+    async def update_run_progress(
+        self,
+        run_id: str,
+        *,
+        total_input_tokens: int | None = None,
+        total_output_tokens: int | None = None,
+        total_tokens: int | None = None,
+        llm_call_count: int | None = None,
+        lead_agent_tokens: int | None = None,
+        subagent_tokens: int | None = None,
+        middleware_tokens: int | None = None,
+        message_count: int | None = None,
+        last_ai_message: str | None = None,
+        first_human_message: str | None = None,
+    ) -> None:
+        """Persist a best-effort running snapshot without changing run status."""
+        return None
+
     @abc.abstractmethod
     async def list_pending(self, *, before: str | None = None) -> list[dict[str, Any]]:
         pass
 
     @abc.abstractmethod
-    async def aggregate_tokens_by_thread(self, thread_id: str) -> dict[str, Any]:
+    async def list_inflight(self, *, before: str | None = None) -> list[dict[str, Any]]:
+        """Return persisted runs that are still ``pending`` or ``running``."""
+        pass
+
+    @abc.abstractmethod
+    async def aggregate_tokens_by_thread(self, thread_id: str, *, include_active: bool = False) -> dict[str, Any]:
         """Aggregate token usage for completed runs in a thread.
 
         Returns a dict with keys: total_tokens, total_input_tokens,

backend/packages/harness/deerflow/runtime/runs/store/memory.py

@@ -46,8 +46,13 @@ class MemoryRunStore(RunStore):
             "updated_at": now,
         }
 
-    async def get(self, run_id):
+    async def get(self, run_id, *, user_id=None):
-        return self._runs.get(run_id)
+        run = self._runs.get(run_id)
+        if run is None:
+            return None
+        if user_id is not None and run.get("user_id") != user_id:
+            return None
+        return run
 
     async def list_by_thread(self, thread_id, *, user_id=None, limit=100):
         results = [r for r in self._runs.values() if r["thread_id"] == thread_id and (user_id is None or r.get("user_id") == user_id)]
@@ -60,6 +65,13 @@ class MemoryRunStore(RunStore):
             if error is not None:
                 self._runs[run_id]["error"] = error
             self._runs[run_id]["updated_at"] = datetime.now(UTC).isoformat()
+            return True
+        return False
+
+    async def update_model_name(self, run_id, model_name):
+        if run_id in self._runs:
+            self._runs[run_id]["model_name"] = model_name
+            self._runs[run_id]["updated_at"] = datetime.now(UTC).isoformat()
 
     async def delete(self, run_id):
         self._runs.pop(run_id, None)
@@ -71,6 +83,15 @@ class MemoryRunStore(RunStore):
                 if value is not None:
                     self._runs[run_id][key] = value
             self._runs[run_id]["updated_at"] = datetime.now(UTC).isoformat()
+            return True
+        return False
+
+    async def update_run_progress(self, run_id, **kwargs):
+        if run_id in self._runs and self._runs[run_id].get("status") == "running":
+            for key, value in kwargs.items():
+                if value is not None:
+                    self._runs[run_id][key] = value
+            self._runs[run_id]["updated_at"] = datetime.now(UTC).isoformat()
 
     async def list_pending(self, *, before=None):
         now = before or datetime.now(UTC).isoformat()
@@ -78,8 +99,15 @@ class MemoryRunStore(RunStore):
         results.sort(key=lambda r: r["created_at"])
         return results
 
-    async def aggregate_tokens_by_thread(self, thread_id: str) -> dict[str, Any]:
+    async def list_inflight(self, *, before=None):
-        completed = [r for r in self._runs.values() if r["thread_id"] == thread_id and r.get("status") in ("success", "error")]
+        now = before or datetime.now(UTC).isoformat()
+        results = [r for r in self._runs.values() if r["status"] in ("pending", "running") and r["created_at"] <= now]
+        results.sort(key=lambda r: r["created_at"])
+        return results
+
+    async def aggregate_tokens_by_thread(self, thread_id: str, *, include_active: bool = False) -> dict[str, Any]:
+        statuses = ("success", "error", "running") if include_active else ("success", "error")
+        completed = [r for r in self._runs.values() if r["thread_id"] == thread_id and r.get("status") in statuses]
         by_model: dict[str, dict] = {}
         for r in completed:
             model = r.get("model_name") or "unknown"

backend/packages/harness/deerflow/runtime/runs/streams/__init__.py

@@ -0,0 +1,8 @@
+"""Realtime stream contracts for run application use cases."""
+
+from .run_stream_broker import RunStreamBroker, RunStreamEvent
+
+__all__ = [
+    "RunStreamBroker",
+    "RunStreamEvent",
+]

backend/packages/harness/deerflow/runtime/runs/streams/run_stream_broker.py

@@ -0,0 +1,44 @@
+"""Realtime run stream broker contract."""
+
+from __future__ import annotations
+
+from collections.abc import AsyncIterator
+from dataclasses import dataclass
+from typing import Any, Protocol
+
+from ..domain import RunId
+
+
+@dataclass(frozen=True)
+class RunStreamEvent:
+    id: str
+    event: str
+    data: Any
+
+
+class RunStreamBroker(Protocol):
+    """Realtime publish/subscribe boundary for run streams."""
+
+    async def publish(self, run_id: RunId, event: str, data: Any) -> None:
+        pass
+
+    async def publish_terminal(self, run_id: RunId, *, event: str = "end", data: Any = None) -> None:
+        pass
+
+    def subscribe(
+        self,
+        run_id: RunId,
+        *,
+        last_event_id: str | None = None,
+        heartbeat_interval: float = 15.0,
+    ) -> AsyncIterator[RunStreamEvent]:
+        pass
+
+    async def cleanup(self, run_id: RunId, *, delay: float = 0) -> None:
+        pass
+
+
+__all__ = [
+    "RunStreamBroker",
+    "RunStreamEvent",
+]