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Title: fix: set newline='' on TextIOWrapper in stdio_server to prevent Windows CRLF corruption by EvanYao826 · Pull Request #2574 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: fix: set newline='' on TextIOWrapper in stdio_server to prevent Windows CRLF corruption by EvanYao826 · Pull Request #2574 · modelcontextprotocol/python-sdk

X Title: fix: set newline='' on TextIOWrapper in stdio_server to prevent Windows CRLF corruption by EvanYao826 · Pull Request #2574 · modelcontextprotocol/python-sdk

Description: Fixes #2433 Summary On Windows, TextIOWrapper defaults to platform-native line endings ( ), which corrupts newline-delimited JSON-RPC messages over stdio. The server-side stdio_server() wraps sys.stdout in a TextIOWrapper without specifying newline=, so any in the JSON payload gets converted to , breaking clients that parse on . Fix Add newline= to the TextIOWrapper constructor in stdio_server(), matching the pattern already used in the server-side fix from PR #2302. Test Added a test verifying that the TextIOWrapper used in stdio_server has newline= set, preventing CRLF conversion.

Open Graph Description: Fixes #2433 Summary On Windows, TextIOWrapper defaults to platform-native line endings ( ), which corrupts newline-delimited JSON-RPC messages over stdio. The server-side stdio_server() wraps sys.s...

X Description: Fixes #2433 Summary On Windows, TextIOWrapper defaults to platform-native line endings ( ), which corrupts newline-delimited JSON-RPC messages over stdio. The server-side stdio_server() wraps sys.s...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2574

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7591a78 fix: set newline='' on TextIOWrapper in stdio_server to prevent Windo… EvanYao826 May 11, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2574/commits/7591a78a553a50084e4aa02daf64f5f1444597aa
b882921 fix: type annotations for test capturing_textiowrapper kwargs EvanYao826 May 11, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2574/commits/b8829215d3a12c0aec4cd7a8d0d12257c3274ca4
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