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fix(subagent): isolate subagent from parent run checkpointer (#3559)

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Subagent _create_agent() now passes checkpointer=False to prevent
inheriting the parent run's synchronous checkpointer via copy_context(),
which would cause NotImplementedError when aget_tuple() is called on
the async path. Subagents are one-shot delegations that never resume,
so persistence is unnecessary.
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heart-scalpel
2026-06-14 10:30:45 +08:00
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parent 1783da42f4
commit 47e9570d86
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@@ -315,6 +315,7 @@ Proxied through nginx: `/api/langgraph/*` → Gateway LangGraph-compatible runti
**Flow**: `task()` tool → `SubagentExecutor` → background thread → poll 5s → SSE events → result
**Events**: `task_started`, `task_running`, `task_completed`/`task_failed`/`task_timed_out`
**Deferred MCP tools** (if `tool_search.enabled`): `SubagentExecutor._build_initial_state` assembles deferral after policy filtering via the shared `assemble_deferred_tools` (fail-closed), appends the `tool_search` tool, injects the `<available-deferred-tools>` section into the subagent's `SystemMessage`, and threads the setup to `_create_agent`, which attaches `DeferredToolFilterMiddleware` through `build_subagent_runtime_middlewares(deferred_setup=...)`. Subagents thus withhold full MCP schemas until promotion, same as the lead agent; each task run gets a fresh `ThreadState` so promotion is isolated per run
**Checkpointer isolation**: Subagent graphs are compiled with `checkpointer=False` to avoid inheriting the parent run's checkpointer, since subagents are one-shot and never resume.
### Tool System (`packages/harness/deerflow/tools/`)