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Title: fix: disable newline translation in stdio TextIOWrapper to prevent CRLF on Windows by Maanik23 · Pull Request #2552 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: fix: disable newline translation in stdio TextIOWrapper to prevent CRLF on Windows by Maanik23 · Pull Request #2552 · modelcontextprotocol/python-sdk

X Title: fix: disable newline translation in stdio TextIOWrapper to prevent CRLF on Windows by Maanik23 · Pull Request #2552 · modelcontextprotocol/python-sdk

Description: The official Python SDK for Model Context Protocol servers and clients - fix: disable newline translation in stdio TextIOWrapper to prevent CRLF on Windows by Maanik23 · Pull Request #2552 · modelcontextprotocol/python-sdk

Open Graph Description: Fixes #2433 Summary On Windows, TextIOWrapper without newline="" performs universal newline translation (\n → \r\n on write), corrupting the newline-delimited JSON wire format used by MCP...

X Description: Fixes #2433 Summary On Windows, TextIOWrapper without newline="" performs universal newline translation (\n → \r\n on write), corrupting the newline-delimited JSON wire format use...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2552

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Fix Windows CRLF in stdio server TextIOWrapper #2497 https://github.com/modelcontextprotocol/python-sdk/pull/2497
fix: prevent CRLF translation in stdio_server on Windows #2743 https://github.com/modelcontextprotocol/python-sdk/pull/2743
Fix stdio server newline translation on Windows #2757 https://github.com/modelcontextprotocol/python-sdk/pull/2757
fix: stdio_server emits LF only on Windows stdout (fixes #2433) #2908 https://github.com/modelcontextprotocol/python-sdk/pull/2908
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Jul 8, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2552#ref-issue-4668914944
aws-pricing-mcp-server fails to connect on Windows (stdio JSON parse error) awslabs/mcp#3823 https://github.com/awslabs/mcp/issues/3823
Windows: TextIOWrapper in stdio_server() emits CRLF instead of LF, corrupting newline-delimited JSON messages #2433 https://github.com/modelcontextprotocol/python-sdk/issues/2433
fix: stop newline translation corrupting stdio framing on Windows #3132 https://github.com/modelcontextprotocol/python-sdk/pull/3132
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Windows: TextIOWrapper in stdio_server() emits CRLF instead of LF, corrupting newline-delimited JSON messages https://github.com/modelcontextprotocol/python-sdk/issues/2433
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