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Don't block the event loop on non-async functions by Kludex · Pull Request #1909 · modelcontextprotocol/python-sdk · GitHub

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Don't block the event loop on non-async functions #1909

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Merged
Kludex merged 2 commits into from
Jan 19, 2026
Conversation 0 Commits 2 Checks 26 Files changed
Merged

Don't block the event loop on non-async functions #1909

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c483055
Don't block the event loop on non-async functions
Kludex Jan 18, 2026
52e92bf
Merge branch 'main' into run-anyio-to-thread
Kludex Jan 19, 2026
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9 changes: 5 additions & 4 deletions src/mcp/server/fastmcp/utilities/func_metadata.py
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Original file line number Diff line number Diff line change
@@ -1,10 +1,13 @@
import functools
import inspect
import json
from collections.abc import Awaitable, Callable, Sequence
from itertools import chain
from types import GenericAlias
from typing import Annotated, Any, cast, get_args, get_origin, get_type_hints

import anyio
import anyio.to_thread
import pydantic_core
from pydantic import BaseModel, ConfigDict, Field, WithJsonSchema, create_model
from pydantic.fields import FieldInfo
Expand Down Expand Up @@ -53,9 +56,7 @@ def model_dump_one_level(self) -> dict[str, Any]:
kwargs[output_name] = value
return kwargs

model_config = ConfigDict(
arbitrary_types_allowed=True,
)
model_config = ConfigDict(arbitrary_types_allowed=True)


class FuncMetadata(BaseModel):
Expand Down Expand Up @@ -85,7 +86,7 @@ async def call_fn_with_arg_validation(
if fn_is_async:
return await fn(**arguments_parsed_dict)
else:
return fn(**arguments_parsed_dict)
return await anyio.to_thread.run_sync(functools.partial(fn, **arguments_parsed_dict))

def convert_result(self, result: Any) -> Any:
"""Convert the result of a function call to the appropriate format for
Expand Down
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