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Title: fix(stdio): allow configurable memory stream buffer size by yaowubarbara · Pull Request #2215 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: fix(stdio): allow configurable memory stream buffer size by yaowubarbara · Pull Request #2215 · modelcontextprotocol/python-sdk

X Title: fix(stdio): allow configurable memory stream buffer size by yaowubarbara · Pull Request #2215 · modelcontextprotocol/python-sdk

Description: The official Python SDK for Model Context Protocol servers and clients - fix(stdio): allow configurable memory stream buffer size by yaowubarbara · Pull Request #2215 · modelcontextprotocol/python-sdk

Open Graph Description: Summary Add and parameters to to decouple the stdin reader from the message processor. Problem With the current hardcoded in , the stdin reader blocks on until the message processor calls . Wh...

X Description: Summary Add and parameters to to decouple the stdin reader from the message processor. Problem With the current hardcoded in , the stdin reader blocks on until the message processor calls . Wh...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2215

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Mar 5, 2026https://github.com/modelcontextprotocol/python-sdk/pull/2215#issue-4028913147
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fix(stdio): allow configurable memory stream buffer size in stdio_serverhttps://github.com/modelcontextprotocol/python-sdk/pull/2215/commits/77b7e4b041c4e2b930eea38a913a4890d304e328
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fix: rename unused write_stream to _write_stream in testshttps://github.com/modelcontextprotocol/python-sdk/pull/2215/commits/084ac9e9567422b95d0766f4992261dd987c438c
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fix: close write_stream in tests to prevent task group hanghttps://github.com/modelcontextprotocol/python-sdk/pull/2215/commits/349bdf397ccc781c9912043a98771981c903d034
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stdio_server uses unbuffered memory streams which can cause server to block and become unresponsive https://github.com/modelcontextprotocol/python-sdk/issues/1333
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