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fix: catch BrokenPipeError in stdio stdout_writer #3097

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fix: catch BrokenPipeError in stdio stdout_writer #3097

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8 changes: 7 additions & 1 deletion src/mcp/server/stdio.py
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Original file line number Diff line number Diff line change
Expand Up @@ -68,7 +68,13 @@ async def stdout_writer():
json = session_message.message.model_dump_json(by_alias=True, exclude_unset=True)
await stdout.write(json + "\n")
await stdout.flush()
except anyio.ClosedResourceError: # pragma: no cover
except (anyio.ClosedResourceError, BrokenPipeError, ConnectionResetError): # pragma: no cover
# BrokenPipeError / ConnectionResetError occur when the parent
# process (MCP client) closes the stdout pipe — e.g. during
# restart, kill, or graceful shutdown. This is a graceful
# shutdown signal, not a crash — suppress it so the server
# exits cleanly instead of propagating an ExceptionGroup from
# anyio's TaskGroup.
await anyio.lowlevel.checkpoint()

async with anyio.create_task_group() as tg:
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