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Title: fix: suppress completed request cancellation leak by MukundaKatta · Pull Request #2611 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: fix: suppress completed request cancellation leak by MukundaKatta · Pull Request #2611 · modelcontextprotocol/python-sdk

X Title: fix: suppress completed request cancellation leak by MukundaKatta · Pull Request #2611 · modelcontextprotocol/python-sdk

Description: Summary return the underlying CancelScope.exit suppression result from RequestResponder.exit swallow a late cancellation from an already-cancelled/completed responder so cancelled requests do not tear down sibling tasks add regressions for completed responder cancellations Fixes #2610. Tests uv run pytest tests/shared/test_session.py -q -k "request_responder or request_cancellation" uv run pytest tests/server/test_cancel_handling.py tests/shared/test_session.py -q uv run ruff check src/mcp/shared/session.py tests/shared/test_session.py uv run ruff format --check src/mcp/shared/session.py tests/shared/test_session.py uv run pyright src/mcp/shared/session.py tests/shared/test_session.py

Open Graph Description: Summary return the underlying CancelScope.exit suppression result from RequestResponder.exit swallow a late cancellation from an already-cancelled/completed responder so cancelled requests do not ...

X Description: Summary return the underlying CancelScope.exit suppression result from RequestResponder.exit swallow a late cancellation from an already-cancelled/completed responder so cancelled requests do not ...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2611

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274446f fix: suppress completed request cancellation leak MukundaKatta May 15, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2611/commits/274446f97abd21eccaddc28340a66f14126157e1
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