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Fix Pydantic field alias consistency in structured output (#1099)

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Seongjun Kim 2025-07-07 23:16:23 +09:00 • committed by GitHub
commit 5c9cf290d8
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src/mcp/server/fastmcp/utilities/func_metadata.py
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@ -111,7 +111,7 @@ class FuncMetadata(BaseModel):
assert self.output_model is not None, "Output model must be set if output schema is defined"
validated = self.output_model.model_validate(result)
structured_content = validated.model_dump(mode="json")
structured_content = validated.model_dump(mode="json", by_alias=True)
return (unstructured_content, structured_content)