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[v1.x] fix: catch PydanticUserError when generating output schema (pydantic 2.13 compat) by maxisbey · Pull Request #2435 · modelcontextprotocol/python-sdk · GitHub

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[v1.x] fix: catch PydanticUserError when generating output schema (pydantic 2.13 compat) #2435

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Merged
maxisbey merged 1 commit into from
Apr 13, 2026
Conversation 1 Commits 1 Checks 22 Files changed
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[v1.x] fix: catch PydanticUserError when generating output schema (pydantic 2.13 compat) #2435

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12 changes: 10 additions & 2 deletions src/mcp/server/fastmcp/utilities/func_metadata.py
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@
BaseModel,
ConfigDict,
Field,
PydanticUserError,
RootModel,
WithJsonSchema,
create_model,
Expand Down Expand Up @@ -411,9 +412,16 @@ def _try_create_model_and_schema(
# Use StrictJsonSchema to raise exceptions instead of warnings
try:
schema = model.model_json_schema(schema_generator=StrictJsonSchema)
except (TypeError, ValueError, pydantic_core.SchemaError, pydantic_core.ValidationError) as e:
except (
PydanticUserError,
TypeError,
ValueError,
pydantic_core.SchemaError,
pydantic_core.ValidationError,
) as e:
# These are expected errors when a type can't be converted to a Pydantic schema
# TypeError: When Pydantic can't handle the type
# PydanticUserError: When Pydantic can't handle the type (e.g. PydanticInvalidForJsonSchema);
# subclasses TypeError on pydantic <2.13 and RuntimeError on pydantic >=2.13
# ValueError: When there are issues with the type definition (including our custom warnings)
# SchemaError: When Pydantic can't build a schema
# ValidationError: When validation fails
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