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
X: @github
Domain: github.com
{"@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"}
| route-pattern | /_view_fragments/issues/show/:user_id/:repository/:id/issue_layout(.:format) |
| route-controller | voltron_issues_fragments |
| route-action | issue_layout |
| fetch-nonce | v2:eb4d74c1-2ac5-2ce2-3d2e-2451ec38d765 |
| current-catalog-service-hash | 81bb79d38c15960b92d99bca9288a9108c7a47b18f2423d0f6438c5b7bcd2114 |
| request-id | DD32:289D0C:1507D45:1C0581D:6A5B8910 |
| html-safe-nonce | 0ab635fb29653dafee7759f38077e997f5728d895546e3843620cde2d3b9bb3e |
| visitor-payload | eyJyZWZlcnJlciI6IiIsInJlcXVlc3RfaWQiOiJERDMyOjI4OUQwQzoxNTA3RDQ1OjFDMDU4MUQ6NkE1Qjg5MTAiLCJ2aXNpdG9yX2lkIjoiNjIyMDk0MzIzNDQ2ODM4Mjk5MiIsInJlZ2lvbl9lZGdlIjoiaWFkIiwicmVnaW9uX3JlbmRlciI6ImlhZCJ9 |
| visitor-hmac | de1b76a4feaf1c2facca5a83fe775e8c270d662215e20f11776df36a176466fe |
| hovercard-subject-tag | issue:2942627093 |
| github-keyboard-shortcuts | repository,issues,copilot |
| google-site-verification | Apib7-x98H0j5cPqHWwSMm6dNU4GmODRoqxLiDzdx9I |
| octolytics-url | https://collector.github.com/github/collect |
| analytics-location | / |
| fb:app_id | 1401488693436528 |
| apple-itunes-app | app-id=1477376905, app-argument=https://github.com/_view_fragments/issues/show/modelcontextprotocol/python-sdk/359/issue_layout |
| twitter:image | https://opengraph.githubassets.com/909d541cc5f42bfcb83a3758c401138dcdd54479c0b7c2bfbdfda92c21a5d200/modelcontextprotocol/python-sdk/issues/359 |
| twitter:card | summary_large_image |
| og:image | https://opengraph.githubassets.com/909d541cc5f42bfcb83a3758c401138dcdd54479c0b7c2bfbdfda92c21a5d200/modelcontextprotocol/python-sdk/issues/359 |
| og:image:alt | 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... |
| og:image:width | 1200 |
| og:image:height | 600 |
| og:site_name | GitHub |
| og:type | object |
| og:author:username | JexinSam |
| hostname | github.com |
| expected-hostname | github.com |
| None | 5290d7e14309ad1e76106a9c4237bd1041517e83ea182c8ab756752cb0c6940b |
| turbo-cache-control | no-preview |
| go-import | github.com/modelcontextprotocol/python-sdk git https://github.com/modelcontextprotocol/python-sdk.git |
| octolytics-dimension-user_id | 182288589 |
| octolytics-dimension-user_login | modelcontextprotocol |
| octolytics-dimension-repository_id | 862584018 |
| octolytics-dimension-repository_nwo | modelcontextprotocol/python-sdk |
| octolytics-dimension-repository_public | true |
| octolytics-dimension-repository_is_fork | false |
| octolytics-dimension-repository_network_root_id | 862584018 |
| octolytics-dimension-repository_network_root_nwo | modelcontextprotocol/python-sdk |
| turbo-body-classes | logged-out env-production page-responsive |
| disable-turbo | false |
| browser-stats-url | https://api.github.com/_private/browser/stats |
| browser-errors-url | https://api.github.com/_private/browser/errors |
| release | 9c975978430e9ad293956f2bbdaf153b1bd84a99 |
| ui-target | full |
| theme-color | #1e2327 |
| color-scheme | light dark |
Links:
Viewport: width=device-width