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feat(subagents): extend deferred MCP tool loading to subagents (#3432)

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* feat(subagents): extend deferred MCP tool loading to subagents (#3341)

Subagents now reuse the lead agent's deferred-tool path: when
tool_search.enabled, MCP tool schemas are withheld from the model and
surfaced by name in <available-deferred-tools>, fetched on demand via the
generated tool_search helper. DeferredToolFilterMiddleware deterministically
rewrites request.tools to hide the deferred schemas (the prompt section is
discovery only, not enforcement).

Consolidates the assembly into deerflow.tools.builtins.tool_search, now the
single home for both assemble_deferred_tools (centralized fail-closed guard,
replacing the lead-only private _assemble_deferred) and the relocated
get_deferred_tools_prompt_section. Shared by every build path: lead agent,
embedded client, and subagent executor.

tool_search is appended after the subagent's name-level tool policy and is
treated as infrastructure: its catalog is built from the already
policy-filtered list, so it can never surface a tool the policy denied.

Follow-up to #3370. Fixes #3341.

* test(subagents): assert the real middleware builder emits a working deferred filter (#3341)

The existing recipe test hand-constructs DeferredToolFilterMiddleware, so it
cannot catch a regression in how build_subagent_runtime_middlewares (the call
executor._create_agent actually makes) wires the deferred setup into the
filter. Add a test that sources the filter from the real builder given a real
setup and runs it through a graph: a wrong catalog hash would silently stop
promotion, a dropped filter would stop hiding — both now caught.

Running the full real middleware stack is intentionally avoided (the other
runtime middlewares need sandbox/thread infra to execute, which would make the
test flaky); their attachment + ordering before Safety stays locked in
test_tool_error_handling_middleware.py.

* test(subagents): keep executor tests config-free in CI

* chore: trigger ci

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Willem Jiang <willem.jiang@gmail.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
This commit is contained in:
AochenShen99
2026-06-08 23:17:22 +08:00
committed by GitHub
parent 3c2b60aaae
commit 3b6dd0a4e3
12 changed files with 551 additions and 83 deletions
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backend/packages/harness/deerflow/agents/lead_agent/prompt.py
+1 -13
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@@ -10,6 +10,7 @@ from deerflow.config.agents_config import load_agent_soul
from deerflow.skills.storage import get_or_new_skill_storage
from deerflow.skills.types import Skill, SkillCategory
from deerflow.subagents import get_available_subagent_names
from deerflow.tools.builtins.tool_search import get_deferred_tools_prompt_section
if TYPE_CHECKING:
from deerflow.config.app_config import AppConfig
@@ -693,19 +694,6 @@ Rules:
"""
def get_deferred_tools_prompt_section(*, deferred_names: frozenset[str] = frozenset()) -> str:
"""Generate <available-deferred-tools> from an explicit deferred-name set.
Lists only names so the agent knows what exists and can use tool_search to
load them. Returns empty string when there are no deferred tools. The set is
computed at agent build time (after tool-policy filtering) and passed in.
"""
if not deferred_names:
return ""
names = "\n".join(sorted(deferred_names))
return f"<available-deferred-tools>\n{names}\n</available-deferred-tools>"
def _build_acp_section(*, app_config: AppConfig | None = None) -> str:
"""Build the ACP agent prompt section, only if ACP agents are configured."""
if app_config is None: