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Title: Fix hanging on streams when stdio_client exiting by LionNatsu · Pull Request #559 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: Fix hanging on streams when stdio_client exiting by LionNatsu · Pull Request #559 · modelcontextprotocol/python-sdk

X Title: Fix hanging on streams when stdio_client exiting by LionNatsu · Pull Request #559 · modelcontextprotocol/python-sdk

Description: The official Python SDK for Model Context Protocol servers and clients - Fix hanging on streams when stdio_client exiting by LionNatsu · Pull Request #559 · modelcontextprotocol/python-sdk

Open Graph Description: Triggers a TaskGroup cancel after reaching the finally code block. Motivation and Context stdin_writer in the task group hangs when pressing Ctrl+c. Now we explicitly close the streams blocking. Ho...

X Description: Triggers a TaskGroup cancel after reaching the finally code block. Motivation and Context stdin_writer in the task group hangs when pressing Ctrl+c. Now we explicitly close the streams blocking. Ho...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/559

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Fix hanging on streams when stdio_client exitinghttps://github.com/modelcontextprotocol/python-sdk/pull/559#top
ihrprhttps://github.com/ihrpr
modelcontextprotocol:mainhttps://github.com/modelcontextprotocol/python-sdk/tree/main
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Apr 22, 2025https://github.com/modelcontextprotocol/python-sdk/pull/559#issue-3010247332
Please reload this pagehttps://github.com/modelcontextprotocol/python-sdk/pull/559
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April 22, 2025 14:46https://github.com/modelcontextprotocol/python-sdk/pull/559#commits-pushed-22e2b3a
https://github.com/LionNatsu
Fix the TaskGroup hanging on stdin_writer when stdio_client exitinghttps://github.com/modelcontextprotocol/python-sdk/pull/559/commits/22e2b3a9cf312f129ae1db16c2516bfde12a5017
22e2b3ahttps://github.com/modelcontextprotocol/python-sdk/pull/559/commits/22e2b3a9cf312f129ae1db16c2516bfde12a5017
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Add test_stdio_cm for stdin_writer hanginghttps://github.com/modelcontextprotocol/python-sdk/pull/559/commits/277449646f92e39812b72428618f9cabf0826398
2774496https://github.com/modelcontextprotocol/python-sdk/pull/559/commits/277449646f92e39812b72428618f9cabf0826398
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Test using simple tee instead of mcp-server-fetchhttps://github.com/modelcontextprotocol/python-sdk/pull/559/commits/2591f806b1b6c49f0bf94c2b9f53c20865ed0ba0
2591f80https://github.com/modelcontextprotocol/python-sdk/pull/559/commits/2591f806b1b6c49f0bf94c2b9f53c20865ed0ba0
https://github.com/LionNatsu
Close write_stream_reader in finally blockhttps://github.com/modelcontextprotocol/python-sdk/pull/559/commits/474f0721422430c18f1074f27bdcbffc94e7f3b7
474f072https://github.com/modelcontextprotocol/python-sdk/pull/559/commits/474f0721422430c18f1074f27bdcbffc94e7f3b7
https://github.com/LionNatsu
Fix pyright warnings in test_stdio_cm.pyhttps://github.com/modelcontextprotocol/python-sdk/pull/559/commits/d2f1146d496d1183ac0d386b53cc69510561fc7a
d2f1146https://github.com/modelcontextprotocol/python-sdk/pull/559/commits/d2f1146d496d1183ac0d386b53cc69510561fc7a
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Fix read_stream stream leakagehttps://github.com/modelcontextprotocol/python-sdk/pull/559/commits/12d4740adf523c672354f786e29f698d7b0dd1a5
12d4740https://github.com/modelcontextprotocol/python-sdk/pull/559/commits/12d4740adf523c672354f786e29f698d7b0dd1a5
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Apr 22, 2025https://github.com/modelcontextprotocol/python-sdk/pull/559#event-17350129415
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tests/client/test_stdio_cm.pyhttps://github.com/modelcontextprotocol/python-sdk/pull/559/files/12d4740adf523c672354f786e29f698d7b0dd1a5#diff-dcb319c7f3611f076d5e83f889bb9c29c06f4b34f21d916f24b0890d450eb92a
Please reload this pagehttps://github.com/modelcontextprotocol/python-sdk/pull/559
tests/client/test_stdio_cm.pyhttps://github.com/modelcontextprotocol/python-sdk/pull/559/files/12d4740adf523c672354f786e29f698d7b0dd1a5#diff-dcb319c7f3611f076d5e83f889bb9c29c06f4b34f21d916f24b0890d450eb92a
Please reload this pagehttps://github.com/modelcontextprotocol/python-sdk/pull/559
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May 8, 2025 14:26https://github.com/modelcontextprotocol/python-sdk/pull/559#commits-pushed-15b24eb
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Update test_stdio.pyhttps://github.com/modelcontextprotocol/python-sdk/pull/559/commits/15b24ebc4fa171245d91275e964f57f00f101ce3
15b24ebhttps://github.com/modelcontextprotocol/python-sdk/pull/559/commits/15b24ebc4fa171245d91275e964f57f00f101ce3
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Delete tests/client/test_stdio_cm.pyhttps://github.com/modelcontextprotocol/python-sdk/pull/559/commits/a2e332899683f6fadcc830250ee90c32b04a47a0
a2e3328https://github.com/modelcontextprotocol/python-sdk/pull/559/commits/a2e332899683f6fadcc830250ee90c32b04a47a0
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Update src/mcp/client/stdio/__init__.pyhttps://github.com/modelcontextprotocol/python-sdk/pull/559/commits/a59995eabfe66eb224aee32f4edf28f16d276beb
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Jun 26, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/559#ref-pullrequest-3180045879
Alternative: Stream cleanup only (no timeout mechanism) #1042 https://github.com/modelcontextprotocol/python-sdk/pull/1042
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Jun 26, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/559#ref-commit-506879f
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Simplify stdio cleanup: unified stream cleanup across platformshttps://github.com/modelcontextprotocol/python-sdk/commit/506879feb5b7e26511a01360a379b972ca4046fa
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Unify process termination on POSIX & Windows (+ tests) #1044 https://github.com/modelcontextprotocol/python-sdk/pull/1044
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Fix stdio_client kill process after timeout #555 https://github.com/modelcontextprotocol/python-sdk/pull/555
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Jun 26, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/559#ref-commit-caa5628
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Add regression tests for stdio cleanup hanginghttps://github.com/modelcontextprotocol/python-sdk/commit/caa5628d4e4c4ffb71a24b45fef1f8672cb5e455
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Jul 1, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/559#ref-commit-863dd54
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Simplify stdio cleanup: unified stream cleanup across platformshttps://github.com/modelcontextprotocol/python-sdk/commit/863dd54d61cddeaaaf7f8332886eb4d4abaa0b7b
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Fix stdio cleanup hanging on slow-terminating processeshttps://github.com/modelcontextprotocol/python-sdk/commit/1c820a9c56f6a37e9c688c35ecfe2e0e22699103
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Fix stdio cleanup hanging on slow-terminating processeshttps://github.com/modelcontextprotocol/python-sdk/commit/0205aa0072f13d0ccdcd1b002da3fc57dbbe68ac
0205aa0https://github.com/modelcontextprotocol/python-sdk/commit/0205aa0072f13d0ccdcd1b002da3fc57dbbe68ac
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https://github.com/felixweinberger
https://github.com/cristipufu
Fix stdio cleanup hanging on slow-terminating processeshttps://github.com/modelcontextprotocol/python-sdk/commit/2be6f09dd6ee1f6f4a900825b9b32325905e8103
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https://github.com/cristipufu
Fix stdio cleanup hanging on slow-terminating processeshttps://github.com/modelcontextprotocol/python-sdk/commit/d15efabf2852f54347631e2cede4b2b079e28594
d15efabhttps://github.com/modelcontextprotocol/python-sdk/commit/d15efabf2852f54347631e2cede4b2b079e28594
#555https://github.com/modelcontextprotocol/python-sdk/pull/555
#559https://github.com/modelcontextprotocol/python-sdk/pull/559
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Jun 3, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/559#ref-pullrequest-4581189820
Fix stdio client shutdown bugs and rebuild the stdio test suite #2773 https://github.com/modelcontextprotocol/python-sdk/pull/2773
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