[BlueX888]

Related issue

Fixes #7623

Summary

A tool defined in a module that starts with from __future__ import annotations (PEP 563) was constructed without error and then permanently uncallable: the first call raised ValueError: Tool 'wallet' arguments validation failed: `Wallet` is not fully defined; you should define `WalletArgs`, then call `Wallet.model_rebuild()` , and rendering the tool into a prompt raised PydanticUserError with the same message. It was not limited to user-defined models — Optional[str], Literal["a", "b"] and pathlib.Path failed identically, because every annotation in such a module is stored as a string.

Why (root cause)

Under PEP 563 inspect.Parameter.annotation is a plain str. It was handed straight to pydantic.create_model, and pydantic resolved the resulting ForwardRef against the calling frame's namespace — lib/crewai/src/crewai/tools/base_tool.py — where the caller's names do not exist. On main the raw annotation is read at six schema-building sites:

• base_tool.py:230 and base_tool.py:246 — BaseTool._default_args_schema (the _run and _arun branches)
• base_tool.py:447 — Tool.from_langchain
• base_tool.py:483 — BaseTool._set_args_schema
• base_tool.py:641 — Tool._create_schema_from_function
• base_tool.py:749 — _make_tool

typing.get_type_hints evaluates those strings against func.__globals__, which is what CrewStructuredTool._create_schema_from_function (lib/crewai/src/crewai/tools/structured_tool.py:316) already does — the sibling path returns the right result under the identical repro, which is why the issue called it out as the control.

Changes

• lib/crewai/src/crewai/tools/base_tool.py
  • Adds _resolve_annotations(func): get_type_hints(func, include_extras=True), falling back to the raw func.__annotations__ when evaluation raises, so a name that exists only under TYPE_CHECKING still defers instead of breaking tool construction (unchanged behavior).
  • All six sites above now use _resolve_annotations(target).get(name, Any) instead of the raw param.annotation.
  • include_extras=True is load-bearing: the default recursively strips Annotated[...] metadata while resolving, so x: Annotated[int, Field(gt=10)] would come back as bare int — the schema would lose exclusiveMinimum and run(x=5) would be accepted instead of rejected.

Verification

• Tests added or updated for the changed behavior
• Relevant tests and quality checks pass locally

lib/crewai/tests/tools/test_base_tool_future_annotations.py (new, 14 tests) covers the @tool decorator, BaseTool subclass _run, the lazily derived schema, Tool.from_langchain, an annotation that is unresolvable at runtime, and the Annotated/Field constraints.

Red on main (unpatched base_tool.py, new test file present) — 13 failed, 1 passed:

lib/crewai/src/crewai/tools/base_tool.py:293: in _validate_kwargs
    validated = self.args_schema.model_validate(kwargs)
E   pydantic.errors.PydanticUserError: `Wallet` is not fully defined; you should define `WalletArgs`, then call `Wallet.model_rebuild()`.
E   ValueError: Tool 'wallet' arguments validation failed: `Wallet` is not fully defined; you should define `WalletArgs`, then call `Wallet.model_rebuild()`.
FAILED .../test_base_tool_future_annotations.py::TestToolDecoratorWithFutureAnnotations::test_user_declared_model_argument_validates_at_call_time

Red for the metadata half (get_type_hints without include_extras=True) — 4 failed:

E   assert [] == [Gt(gt=10)]
E   Failed: DID NOT RAISE <class 'ValueError'>
FAILED ...::TestAnnotatedMetadataWithFutureAnnotations::test_distinguishing_metadata_survives_annotation_resolution

Green after the fix:

$ pytest lib/crewai/tests/tools/test_base_tool_future_annotations.py -q
14 passed in 6.24s

$ pytest lib/crewai/tests/tools/ -q
255 passed, 742 warnings in 10.38s

$ ruff check lib/
All checks passed!

$ ruff format --check lib/
937 files already formatted

$ mypy lib/
Success: no issues found in 924 source files

The wider lib/crewai/tests/ run has pre-existing failures in this sandbox. pytest lib/crewai/tests/ -q -p no:randomly reports 56 failures on the patched tree and 69 on unpatched main; diffing the sorted FAILED node-id sets shows the only delta is the 13 new-test failures, so this change introduces no new failures. 54 of the 56 are Anthropic API tests failing with anthropic.APIConnectionError: Connection error.

Additional context

No API keys or network access are needed to reproduce or verify; the failure is purely local schema construction. Python 3.13.15 / pydantic 2.12.5.

AI disclosure: per .github/CONTRIBUTING.md, this PR was authored by an AI agent and requires the llm-generated label. BlueX888 does not have permission to apply labels (AddLabelsToLabelable is rejected), so a maintainer needs to add it; the same note is on #7623.

---

Note

Medium Risk
Changes how every inferred tool args schema is built; behavior is broader than PEP 563 fixes but is covered by new tests and aligns with existing structured-tool behavior.

Overview
Fixes tool argument schema construction when callables live in modules using from __future__ import annotations (PEP 563). Previously, raw string annotations from inspect.signature were passed straight into Pydantic, so types were resolved in base_tool.py instead of the tool author’s module—breaking validation, JSON schema, and prompt rendering for models, Literal, Optional, Path, etc.

base_tool.py adds _resolve_annotations (and per-annotation _eval_annotation_in_module) to evaluate hints in the defining module via get_type_hints(..., include_extras=True), with fallbacks for functools.partial, @no_type_check, and partial failure when a return type exists only under TYPE_CHECKING. All auto-generated args_schema paths (@tool, BaseTool._run/_arun, _set_args_schema, both from_langchain converters) now use resolved hints instead of param.annotation.

Tests cover PEP 563 modules, partials, no_type_check, deferred names, and Annotated constraints so metadata like Field(gt=10) still enforces validation.

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📝 Walkthrough

Tool argument-schema generation now resolves callable annotations before building schemas. The change covers BaseTool, Tool, the @tool decorator, and LangChain conversion paths. Tests cover postponed annotations, schema rendering, validation, constraints, unresolved names, and typed partial callables.

Changes: Tool Annotation Resolution

Layer / File(s)	Summary
Annotation resolution across schema paths lib/crewai/src/crewai/tools/base_tool.py	Adds a shared annotation resolver and uses resolved hints in tool, BaseTool, and LangChain schema generation. Missing hints default to Any; unresolved annotations fall back to raw annotations.
Annotation resolution coverage lib/crewai/tests/tools/test_base_tool_future_annotations.py, lib/crewai/tests/tools/test_base_tool.py	Tests postponed annotations across decorated tools, BaseTool subclasses, and LangChain conversions. Coverage includes models, Optional, Literal, Annotated constraints, schema rendering, validation, unresolved names, and typed partial callables.

Suggested reviewers: joaomdmoura

Priority: ➖ Normal

Severity of issue fixed: Medium

Merge Risk: 🔵 Low · up to 657ce

Tools using no_type_check can accept arguments they previously rejected. The impact is narrow, but restoring the annotation fallback is advisable before merging.

Pre-merge checks: 4 · 1

Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 27.91% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 43 functions across 3 files.	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks (4 passed)

Check name	Status	Explanation
Title check		The title clearly identifies the main change: resolving tool argument annotations. The term "caller's module" is slightly less precise than the implementation's defining module, but the title remains …
Description check		The description includes the related issue, root cause, implementation details, affected schema-building paths, tests, quality checks, known environment failures, and additional context. It satisfies …
Linked Issues check		Issue #7623 requires annotation resolution in the defining callable namespace across _make_tool, _default_args_schema, BaseTool._set_args_schema, and both from_langchain paths. The change adds…
Out of Scope Changes check		The production changes stay within tool argument-schema construction. The added partial-adapter and Annotated metadata coverage verifies compatibility of the annotation-resolution fix. The new tests…

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Actionable comments posted: 1

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In `@lib/crewai/src/crewai/tools/base_tool.py`:
- Line 462: Update the parameter annotation fallback in both
BaseTool.from_langchain and Tool.from_langchain to use param.annotation when it
is not Parameter.empty, otherwise Any, preserving annotations for typed partial
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[hulkbig]

AI-assisted finding: CrewStructuredTool.from_function separately drops Annotated metadata in structured_tool.py. I have a one-line include_extras=True fix and regression tests, with 251 tool tests passing. Would you prefer a separate issue and PR for this path? I can’t apply upstream labels. Could a maintainer advise how to submit both with the required llm-generated label?

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Review comments at @lib/crewai/src/crewai/tools/base_tool.py:
- Line 113: Update the type-hint lookup containing get_type_hints(target,
include_extras=True) to fall back to the callable’s raw annotations when the
resolved hints are empty, while preserving resolved hints when present. Add a
regression test for a typed tool decorated with typing.no_type_check and verify
its parameter annotations still drive validation in both the @tool and BaseTool
schema paths.

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[BlueX888]

Confirmed and fixed in 77dccba (the branch was refreshed onto current main, so the commit id differs from the earlier 7dd41dd series — same changes, replayed on top of eb15c66ce). The if not hints: fallback in _resolve_annotations now evaluates raw string annotations with inspect.signature(target, eval_str=True) before returning them: inspect ignores the __no_type_check__ flag, so PEP 563 strings resolve against the tool's own module and create_model receives real types instead of ForwardRefs. Names that cannot be resolved at runtime (TYPE_CHECKING-only) keep the raw annotations, preserving the documented last-resort semantics handled at the call sites.

Added TestNoTypeCheckWithFutureAnnotations covering the @tool decorator, BaseTool.from_langchain, and Tool.from_langchain paths with a user-declared model annotation: all three fail with ForwardRef('LedgerEntry') is LedgerEntry both on main and on the previous head, and pass with the fix. Both tool test files: 76 passed; ruff and mypy clean.

Heads-up on the checks: Run Tests on the new head will also show the pre-existing main-side failure in tests/llms/test_context_window.py (the Bedrock catalog entry resolving to 200k instead of 1M, assert 170000 == 850000) — it fails across all current PRs and is unrelated to this change (see the breakdown on #7555).

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[BlueX888]

CrewStructuredTool.from_function is not part of this branch: the diff is lib/crewai/src/crewai/tools/base_tool.py plus lib/crewai/tests/tools/test_base_tool_future_annotations.py, so structured_tool.py keeps its current behaviour here and a separate follow-up for that path will not conflict with this one.

For the paths this PR does change, _resolve_annotations calls get_type_hints(target, include_extras=True), so Annotated metadata such as Field(gt=...) reaches the generated schema instead of being stripped.

Whether the from_function path needs its own issue and PR is a maintainer call, and labels are theirs to apply.