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Title: fix: collapse single-exception ExceptionGroups from task groups by Varun6578 · Pull Request #2245 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: fix: collapse single-exception ExceptionGroups from task groups by Varun6578 · Pull Request #2245 · modelcontextprotocol/python-sdk

X Title: fix: collapse single-exception ExceptionGroups from task groups by Varun6578 · Pull Request #2245 · modelcontextprotocol/python-sdk

Description: The official Python SDK for Model Context Protocol servers and clients - fix: collapse single-exception ExceptionGroups from task groups by Varun6578 · Pull Request #2245 · modelcontextprotocol/python-sdk

Open Graph Description: Summary Fixes #2114 — ExceptionGroup wrapping obscures real errors from task groups. When an anyio task group contains tasks and one fails, the exception is always wrapped in an ExceptionGroup — ev...

X Description: Summary Fixes #2114 — ExceptionGroup wrapping obscures real errors from task groups. When an anyio task group contains tasks and one fails, the exception is always wrapped in an ExceptionGroup — ev...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2245

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Mar 7, 2026	https://github.com/modelcontextprotocol/python-sdk/pull/2245#issue-4038151124
#2114	https://github.com/modelcontextprotocol/python-sdk/issues/2114
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fix: collapse single-exception ExceptionGroups from task groups	https://github.com/modelcontextprotocol/python-sdk/pull/2245/commits/349661c14f0ea4a3b2995db77fa9c04e14e5ce83
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fix: add Python 3.10 compat for BaseExceptionGroup import	https://github.com/modelcontextprotocol/python-sdk/pull/2245/commits/4943417b65ea5fae8874e3d3d1d1a00221c116be
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fix: resolve pyright and coverage CI failures	https://github.com/modelcontextprotocol/python-sdk/pull/2245/commits/dc630221b7c9661be0e419be4d61987a98ec1a47
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fix: use pragma lax no cover for version-conditional imports, add reg…	https://github.com/modelcontextprotocol/python-sdk/pull/2245/commits/d549d59dad50ce01e11a0c7c71545fd66e752ad6
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test: add start() not-entered guard to completeness test	https://github.com/modelcontextprotocol/python-sdk/pull/2245/commits/851f41ad3a87cb86d423f721284d71b2790f617b
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ExceptionGroup wrapping obscures real errors from task groups	https://github.com/modelcontextprotocol/python-sdk/issues/2114
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