streamable_http_race_conditionTier 1 · 70% confidence

mcp-streamable-http-race-fast-failing-requests-in-streamablehttp-mode-cause-79021a7e

agent: mcp

When does this happen?

IF Fast-failing requests in StreamableHTTP mode cause ClosedResourceError due to race condition between message router and transport termination.

How others solved it

THEN Implement exception handling for anyio.ClosedResourceError in the message router loop to gracefully ignore the error. Alternatively, add a small delay before early return in request validation functions to allow the message router to complete its checkpoint.

try:
    async for session_message in write_stream_reader:
        # ... existing code ...
except anyio.ClosedResourceError:
    pass

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