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Title: stdio_client not starting in windows: getting NotImplementedError · Issue #359 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: stdio_client not starting in windows: getting NotImplementedError · Issue #359 · modelcontextprotocol/python-sdk

X Title: stdio_client not starting in windows: getting NotImplementedError · Issue #359 · modelcontextprotocol/python-sdk

Description: anyio.open_process in stdio_client not working in windows. It raises NotImplementedError. async with stdio_client(server_params) as (read, write): async with ClientSession( read, write, sampling_callback=handle_sampling_message ) as sess...

Open Graph Description: anyio.open_process in stdio_client not working in windows. It raises NotImplementedError. async with stdio_client(server_params) as (read, write): async with ClientSession( read, write, sampling_ca...

X Description: anyio.open_process in stdio_client not working in windows. It raises NotImplementedError. async with stdio_client(server_params) as (read, write): async with ClientSession( read, write, sampling_ca...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/issues/359

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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"stdio_client not starting in windows: getting NotImplementedError","articleBody":"anyio.open_process in stdio_client not working in windows. It raises NotImplementedError.\n\n```python\nasync with stdio_client(server_params) as (read, write):\n        async with ClientSession(\n            read, write, sampling_callback=handle_sampling_message\n        ) as session:\n            # Initialize the connection\n            await session.initialize()\n```\n\nIt gives out error:\n\n```\n   async with stdio_client(server_param) as (read, write):\n  File \"C:\\Python311\\Lib\\contextlib.py\", line 204, in __aenter__\n    return await anext(self.gen)\n           ^^^^^^^^^^^^^^^^^^^^^\n  File \"C:\\Python311\\Lib\\site-packages\\mcp\\client\\stdio.py\", line 104, in stdio_client\n    process = await anyio.open_process(\n              ^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"C:\\Python311\\Lib\\site-packages\\anyio\\_core\\_subprocesses.py\", line 190, in open_process\n    return await get_async_backend().open_process(\n           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"C:\\Python311\\Lib\\site-packages\\anyio\\_backends\\_asyncio.py\", line 2561, in open_process\n    process = await asyncio.create_subprocess_exec(\n              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"C:\\Python311\\Lib\\asyncio\\subprocess.py\", line 218, in create_subprocess_exec\n    transport, protocol = await loop.subprocess_exec(\n                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"C:\\Python311\\Lib\\asyncio\\base_events.py\", line 1680, in subprocess_exec\n    transport = await self._make_subprocess_transport(\n                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\n  File \"C:\\Python311\\Lib\\asyncio\\base_events.py\", line 502, in _make_subprocess_transport\n    raise NotImplementedError\nNotImplementedError\n```\n\n\nIs there a solution to this?","author":{"url":"https://github.com/JexinSam","@type":"Person","name":"JexinSam"},"datePublished":"2025-03-24T09:38:32.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":10},"url":"https://github.com/359/python-sdk/issues/359"}

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