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fix(tools): unwrap FieldInfo default to avoid pydantic warning #2955

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fix(tools): unwrap FieldInfo default to avoid pydantic warning #2955

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13 changes: 11 additions & 2 deletions strands-py/src/strands/tools/decorator.py
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Original file line number Diff line number Diff line change
Expand Up @@ -163,8 +163,17 @@ def _extract_annotated_metadata(
final_description = description
if final_description is None:
final_description = self.param_descriptions.get(param_name) or f"Parameter {param_name}"
# Create FieldInfo object from scratch
final_field = Field(default=param_default, description=final_description)
# If the parameter's default is already a FieldInfo (e.g. Field(default_factory=list,
# ge=0)), use it directly so constraints in its metadata are preserved. Wrapping it
# in another Field(default=<FieldInfo>) would nest a non-JSON-serializable default
# and trigger PydanticJsonSchemaWarning.
if isinstance(param_default, FieldInfo):
if param_default.description is None:
final_field = FieldInfo.merge_field_infos(param_default, FieldInfo(description=final_description))
else:
final_field = param_default
else:
final_field = Field(default=param_default, description=final_description)

return actual_type, final_field

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