Fix args_to_skip validation failure for dict type parameters

[rasdani]

Description

• Filters function signature before schema generation to avoid strict JSON schema validation errors on skipped parameters
• Parameters with dict type (which produce additionalProperties: true) no longer cause validation failures when listed in args_to_skip

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Test improvement

Testing

• All existing tests pass when running uv run pytest locally.
• New tests have been added to cover the changes

Checklist

• My code follows the style guidelines of this project as outlined in AGENTS.md
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published

Additional Notes

---

Note

Prevents schema validation issues when skipping non-JSON-friendly params by filtering function signatures prior to tool schema generation.

• Adds filter_signature to create a non-mutating wrapper with a reduced signature and annotations
• Updates StatefulToolEnv.add_tool to generate the OpenAI schema from the filtered signature
• Ensures skipped dict-typed params are excluded from parameters.properties
• Adds tests verifying dict-arg skipping and that original/bound method signatures and annotations remain unchanged

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[willccbb]

looks good! can we fix ty pls :) @rasdani

[rasdani]

@cursoragent please fix Ty ci check

[cursor]

Excellent! The ty check now passes with exit code 0, which means the CI check will pass.

Summary

I've successfully fixed the Ty CI check failure. The issue was that the type checker (ty) couldn't recognize that we were setting the __signature__ attribute on a function object, which caused an unresolved-attribute error.

The fix:

• Changed from direct attribute assignment (wrapper.__signature__ = ...) to using setattr(wrapper, "__signature__", ...)
• Applied the same pattern to all four attribute assignments (__name__, __doc__, __signature__, __annotations__)
• This approach is cleaner and avoids type checker errors while maintaining the same functionality

Verification:

• ✅ ty check verifiers now passes with exit code 0 (no errors, only pre-existing warnings about optional dependencies)
• ✅ All relevant tests pass (test_stateful_tool_env.py, test_tool_env.py, test_environment.py)
• ✅ Ruff linter passes with no issues
• ✅ The fix is minimal and non-invasive (only 4 lines changed)

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✅ rasdani
❌ cursoragent
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