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Increasing Buffer Size in MCP stdio Transport #1143

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Increasing Buffer Size in MCP stdio Transport #1143

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5 changes: 3 additions & 2 deletions src/mcp/server/stdio.py
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Original file line number Diff line number Diff line change
Expand Up @@ -54,8 +54,9 @@ async def stdio_server(
write_stream: MemoryObjectSendStream[SessionMessage]
write_stream_reader: MemoryObjectReceiveStream[SessionMessage]

read_stream_writer, read_stream = anyio.create_memory_object_stream(0)
write_stream, write_stream_reader = anyio.create_memory_object_stream(0)
# FIXED: Changed from 0 to 10 to create buffered streams
read_stream_writer, read_stream = anyio.create_memory_object_stream(10)
write_stream, write_stream_reader = anyio.create_memory_object_stream(10)
Comment on lines +57 to +59
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I think the idea is exactly to not have this buffer.


async def stdin_reader():
try:
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