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Title: Fix Windows subprocess NotImplementedError for STDIO clients by felixweinberger · Pull Request #1009 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: Fix Windows subprocess NotImplementedError for STDIO clients by felixweinberger · Pull Request #1009 · modelcontextprotocol/python-sdk

X Title: Fix Windows subprocess NotImplementedError for STDIO clients by felixweinberger · Pull Request #1009 · modelcontextprotocol/python-sdk

Description: WarningTHIS IS FOR REVIEW ONLY - PR #596 should be the one that gets merged. This is a rebase of PR #596 (#596) by @theailanguage with merge conflicts resolved and (presumed) unrelated changes removed. Original fix by @theailanguage implements a fallback mechanism for Windows where asyncio.create_subprocess_exec raises NotImplementedError. Uses subprocess.Popen directly with async stream wrappers to maintain compatibility. The DummyProcess class wraps the synchronous Popen object and provides the same interface as anyio.Process for seamless integration. Resolves subprocess creation issues on Windows, particularly in environments with different event loop configurations like Streamlit.

Open Graph Description: WarningTHIS IS FOR REVIEW ONLY - PR #596 should be the one that gets merged. This is a rebase of PR #596 (#596) by @theailanguage with merge conflicts resolved and (presumed) unrelated changes rem...

X Description: WarningTHIS IS FOR REVIEW ONLY - PR #596 should be the one that gets merged. This is a rebase of PR #596 (#596) by @theailanguage with merge conflicts resolved and (presumed) unrelated changes rem...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/1009

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Fix Windows subprocess NotImplementedError for STDIO clients https://github.com/modelcontextprotocol/python-sdk/pull/1009/files#top
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fc775e9 Fix Windows subprocess NotImplementedError for STDIO clients felixweinberger Jun 23, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1009/commits/fc775e96428f33564ecf69be2a4e9f95a2cdea23
6a703a4 Fix ResourceWarning by properly closing file handles in DummyProcess felixweinberger Jun 23, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1009/commits/6a703a4e0027b13acb4f2b22ccba5b020b3bcf1f
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