fix(stdio): allow configurable memory stream buffer size#2215
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yaowubarbara wants to merge 3 commits intomodelcontextprotocol:mainfrom
Open
fix(stdio): allow configurable memory stream buffer size#2215yaowubarbara wants to merge 3 commits intomodelcontextprotocol:mainfrom
yaowubarbara wants to merge 3 commits intomodelcontextprotocol:mainfrom
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Add read_stream_buffer_size and write_stream_buffer_size parameters to stdio_server() to allow decoupling the stdin reader from the message processor. With the default buffer_size=0, the reader blocks on send() until the processor consumes the message, causing the server to become unresponsive during slow operations. A non-zero buffer allows the reader to queue messages ahead, preventing ping timeouts and request starvation. Closes modelcontextprotocol#1333
The two new buffer tests did not close write_stream, causing stdout_writer to block indefinitely on write_stream_reader iteration. This prevented the task group from exiting, hanging the test until CI timeout.
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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
Test plan
Closes #1333