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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: 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 . When processing is slow (database queries, API calls), the reader cannot accept new messages including pings, causing the server to become unresponsive. See #1333 for details. Solution Add two optional parameters with default value (preserving current behavior) Pass them through to Users can set to allow the reader to queue messages ahead of the processor Test plan Added : verifies basic functionality with non-zero buffer Added : verifies buffered mode allows concurrent message reading during slow processing Existing continues to pass (backward compatible) Closes #1333

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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77b7e4b fix(stdio): allow configurable memory stream buffer size in stdio_server yaowubarbara Mar 5, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2215/commits/77b7e4b041c4e2b930eea38a913a4890d304e328
084ac9e fix: rename unused write_stream to _write_stream in tests yaowubarbara Mar 5, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2215/commits/084ac9e9567422b95d0766f4992261dd987c438c
349bdf3 fix: close write_stream in tests to prevent task group hang yaowubarbara Mar 6, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2215/commits/349bdf397ccc781c9912043a98771981c903d034
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