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Title: fix(stdio_client): tolerate invalid UTF-8 from child stdout by shaun0927 · Pull Request #2456 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: fix(stdio_client): tolerate invalid UTF-8 from child stdout by shaun0927 · Pull Request #2456 · modelcontextprotocol/python-sdk

X Title: fix(stdio_client): tolerate invalid UTF-8 from child stdout by shaun0927 · Pull Request #2456 · modelcontextprotocol/python-sdk

Description: The official Python SDK for Model Context Protocol servers and clients - fix(stdio_client): tolerate invalid UTF-8 from child stdout by shaun0927 · Pull Request #2456 · modelcontextprotocol/python-sdk

Open Graph Description: Fixes #2454 Summary stdio_client() currently decodes child stdout with encoding_error_handler="strict", so a malformed UTF-8 line can raise during TextReceiveStream(...) iteration and cra...

X Description: Fixes #2454 Summary stdio_client() currently decodes child stdout with encoding_error_handler="strict", so a malformed UTF-8 line can raise during TextReceiveStream(...) iteration...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2456

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Prevent malformed child stdout from crashing stdio_clienthttps://github.com/modelcontextprotocol/python-sdk/pull/2456/commits/f474aa7e52ad2a081f7accd657b8cf2873233b8c
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Keep stdio_client strict-no-cover in sync with exercised behaviorhttps://github.com/modelcontextprotocol/python-sdk/pull/2456/commits/91ae0ad4c79f97f8ef0c7ceb3ea201c7c6c0cd72
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Apr 17, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2456#ref-issue-4276797834
stdio_client crashes on malformed UTF-8 from child stdout instead of surfacing parse error #2454 https://github.com/modelcontextprotocol/python-sdk/issues/2454
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fix: default encoding_error_handler to 'replace' in StdioServerParameters #2495 https://github.com/modelcontextprotocol/python-sdk/pull/2495
fix: default encoding_error_handler to replace in stdio_client for UTF-8 resilience #2553 https://github.com/modelcontextprotocol/python-sdk/pull/2553
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fix(client): tolerate invalid UTF-8 from server stdout in stdio_client #2873 https://github.com/modelcontextprotocol/python-sdk/pull/2873
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