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fix(stdio): allow configurable memory-stream buffer size #2163

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fix(stdio): allow configurable memory-stream buffer size #2163

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11 changes: 8 additions & 3 deletions src/mcp/server/stdio.py
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Original file line number Diff line number Diff line change
Expand Up @@ -30,7 +30,12 @@ async def run_server():


@asynccontextmanager
async def stdio_server(stdin: anyio.AsyncFile[str] | None = None, stdout: anyio.AsyncFile[str] | None = None):
async def stdio_server(
stdin: anyio.AsyncFile[str] | None = None,
stdout: anyio.AsyncFile[str] | None = None,
read_stream_buffer_size: int = 0,
write_stream_buffer_size: int = 0,
):
"""Server transport for stdio: this communicates with an MCP client by reading
from the current process' stdin and writing to stdout.
"""
Expand All @@ -49,8 +54,8 @@ async def stdio_server(stdin: anyio.AsyncFile[str] | None = None, stdout: anyio.
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)
read_stream_writer, read_stream = anyio.create_memory_object_stream(read_stream_buffer_size)
write_stream, write_stream_reader = anyio.create_memory_object_stream(write_stream_buffer_size)

async def stdin_reader():
try:
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