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Allow arbitrary types in model creation by updating config in create_model #1132

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Allow arbitrary types in model creation by updating config in create_model #1132

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10 changes: 9 additions & 1 deletion src/mcp/server/fastmcp/utilities/func_metadata.py
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Original file line number Diff line number Diff line change
Expand Up @@ -56,6 +56,14 @@ def model_dump_one_level(self) -> dict[str, Any]:
)


class OutputModelBase(BaseModel):
"""A model representing the output of a function."""

model_config = ConfigDict(
arbitrary_types_allowed=True,
)


class FuncMetadata(BaseModel):
arg_model: Annotated[type[ArgModelBase], WithJsonSchema(None)]
output_schema: dict[str, Any] | None = None
Expand Down Expand Up @@ -407,7 +415,7 @@ def _create_wrapped_model(func_name: str, annotation: Any, field_info: FieldInfo
if annotation is None:
annotation = type(None)

return create_model(model_name, result=(annotation, field_info), __base__=BaseModel)
return create_model(model_name, result=(annotation, field_info), __base__=OutputModelBase)


def _create_dict_model(func_name: str, dict_annotation: Any) -> type[BaseModel]:
Expand Down
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