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Title: Fix completed request cancellation cleanup by FU-max-boop · Pull Request #2624 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: Fix completed request cancellation cleanup by FU-max-boop · Pull Request #2624 · modelcontextprotocol/python-sdk

X Title: Fix completed request cancellation cleanup by FU-max-boop · Pull Request #2624 · modelcontextprotocol/python-sdk

Description: Summary suppress the cancellation raised by CancelScope.__exit__ only after RequestResponder has already completed and sent a response keep incomplete responder cancellations propagating normally add focused regression coverage for the completed vs incomplete cleanup paths Fixes #2610. Validation uv run pytest tests/shared/test_session.py::test_request_cancellation tests/shared/test_session.py::test_completed_request_responder_suppresses_cancel_scope_exit tests/shared/test_session.py::test_incomplete_request_responder_propagates_cancel_scope_exit tests/server/test_cancel_handling.py -q uv run ruff format --check src/mcp/shared/session.py tests/shared/test_session.py uv run ruff check src/mcp/shared/session.py tests/shared/test_session.py uv run pyright src/mcp/shared/session.py tests/shared/test_session.py git diff --check

Open Graph Description: Summary suppress the cancellation raised by CancelScope.__exit__ only after RequestResponder has already completed and sent a response keep incomplete responder cancellations propagating normally ...

X Description: Summary suppress the cancellation raised by CancelScope.__exit__ only after RequestResponder has already completed and sent a response keep incomplete responder cancellations propagating normally ...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2624

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edb78c0 Fix completed request cancellation cleanup FU-max-boop May 17, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2624/commits/edb78c0e20c08c1c9ad08396523ee87c8db0af2a
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