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Title: fix: send notifications/cancelled on request timeout and caller cancellation by dragogargo · Pull Request #2514 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: fix: send notifications/cancelled on request timeout and caller cancellation by dragogargo · Pull Request #2514 · modelcontextprotocol/python-sdk

X Title: fix: send notifications/cancelled on request timeout and caller cancellation by dragogargo · Pull Request #2514 · modelcontextprotocol/python-sdk

Description: The official Python SDK for Model Context Protocol servers and clients - fix: send notifications/cancelled on request timeout and caller cancellation by dragogargo · Pull Request #2514 · modelcontextprotocol/python-sdk

Open Graph Description: Motivation and Context Fixes #2507. ClientSession.send_request() never emits a notifications/cancelled message when a request is interrupted — either by the SDK's own anyio.fail_after timeout o...

X Description: Motivation and Context Fixes #2507. ClientSession.send_request() never emits a notifications/cancelled message when a request is interrupted — either by the SDK's own anyio.fail_after timeo...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2514

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Apr 28, 2026https://github.com/modelcontextprotocol/python-sdk/pull/2514#issue-4339676187
#2507https://github.com/modelcontextprotocol/python-sdk/issues/2507
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fix: send notifications/cancelled on request timeout and caller cance…https://github.com/modelcontextprotocol/python-sdk/pull/2514/commits/e9ebe4fee8acd11b88be8368f861ff99c1218b29
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modelcontextprotocol#2507https://github.com/modelcontextprotocol/python-sdk/issues/2507
fix: remove unused server_write variables in testshttps://github.com/modelcontextprotocol/python-sdk/pull/2514/commits/be407e83700bd25e0d4f541cfd35a155b7d81606
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ci: retrigger checks (flaky test_standalone_get_stream_reconnection t…https://github.com/modelcontextprotocol/python-sdk/pull/2514/commits/3d02bb55c17e483382db12811a33af38c17d9d21
3d02bb5https://github.com/modelcontextprotocol/python-sdk/pull/2514/commits/3d02bb55c17e483382db12811a33af38c17d9d21
fix: add timeout to shielded cancel notification to prevent hangshttps://github.com/modelcontextprotocol/python-sdk/pull/2514/commits/64288b59b92538271fb4b03f84111b20be3651d0
64288b5https://github.com/modelcontextprotocol/python-sdk/pull/2514/commits/64288b59b92538271fb4b03f84111b20be3651d0
fix: add pragma no branch for async for coverage arcs in testshttps://github.com/modelcontextprotocol/python-sdk/pull/2514/commits/91c7ef567cec7da5933f69bb1ff2682e8d57334c
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fix: eliminate elif branches in test mock_server for 100% coveragehttps://github.com/modelcontextprotocol/python-sdk/pull/2514/commits/486872c2b54f2bb7f2e6ebe73b2101c9507a3798
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fix: remove stale pragma no cover from lines now covered by testshttps://github.com/modelcontextprotocol/python-sdk/pull/2514/commits/7a9b1059f8e7c9a1b9fac0f482c48c152b9cef99
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fix: auto-send notifications/cancelled on anyio task cancellation #2479 https://github.com/modelcontextprotocol/python-sdk/pull/2479
fix: send notifications/cancelled on request timeout and cancellation #2518 https://github.com/modelcontextprotocol/python-sdk/pull/2518
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ClientSession never sends notifications/cancelled when call_tool is cancelled — server-side coroutines leak https://github.com/modelcontextprotocol/python-sdk/issues/2507
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