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Title: fix: explicit stderr piping for Jupyter support (#156) by Ashutosh0x · Pull Request #2030 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: fix: explicit stderr piping for Jupyter support (#156) by Ashutosh0x · Pull Request #2030 · modelcontextprotocol/python-sdk

X Title: fix: explicit stderr piping for Jupyter support (#156) by Ashutosh0x · Pull Request #2030 · modelcontextprotocol/python-sdk

Description: In Jupyter environments, stderr from subprocesses isn't directly visible. To fix this, we pipe stderr via subprocess.PIPE and use a background reader task that detects Jupyter (via is_jupyter()) and prints the output with ANSI red coloring. For standard environments, the output is routed to errlog as before. Also updated create_windows_process to accept int for errlog, allowing subprocess.PIPE. Closes #156

Open Graph Description: In Jupyter environments, stderr from subprocesses isn't directly visible. To fix this, we pipe stderr via subprocess.PIPE and use a background reader task that detects Jupyter (via is_jupyter()...

X Description: In Jupyter environments, stderr from subprocesses isn't directly visible. To fix this, we pipe stderr via subprocess.PIPE and use a background reader task that detects Jupyter (via is_jupyt...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2030

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08f45b8 fix: route subprocess stderr via reader task for Jupyter support (#156) Ashutosh0x Feb 10, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2030/commits/08f45b83eb4c109f709b44a68a7bbc0f56a5d57e
91bc585 style: format and lint fix for #156 Ashutosh0x Feb 10, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2030/commits/91bc58537a18ccd33d067509e853ef510be3811f
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