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Title: Add regression test for issue #1027 by felixweinberger · Pull Request #1069 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: Add regression test for issue #1027 by felixweinberger · Pull Request #1069 · modelcontextprotocol/python-sdk

X Title: Add regression test for issue #1027 by felixweinberger · Pull Request #1069 · modelcontextprotocol/python-sdk

Description: Motivation and Context Issue #1027 reports that MCP server cleanup code (after yield in lifespan) is unreachable when the process is terminated. This PR adds tests that: Demonstrate the issue exists on all platforms (not just Windows) Verify that PR #1091's approach of closing stdin first would fix the issue How Has This Been Tested? Added two tests in test_1027_win_unreachable_cleanup.py: test_lifespan_cleanup_executed - Shows cleanup doesn't run with current termination (xfails) test_stdin_close_triggers_cleanup - Shows cleanup works when stdin is closed first (passes) Tested on both macOS and Windows. When run with PR #1091's changes, both tests pass. Breaking Changes None. Tests only. Types of changes Bug fix (non-breaking change which fixes an issue) New feature (non-breaking change which adds functionality) Breaking change (fix or feature that would cause existing functionality to change) Documentation update Checklist I have read the MCP Documentation My code follows the repository's style guidelines New and existing tests pass locally I have added appropriate error handling I have added or updated documentation as needed Additional context

Open Graph Description: Motivation and Context Issue #1027 reports that MCP server cleanup code (after yield in lifespan) is unreachable when the process is terminated. This PR adds tests that: Demonstrate the issue exi...

X Description: Motivation and Context Issue #1027 reports that MCP server cleanup code (after yield in lifespan) is unreachable when the process is terminated. This PR adds tests that: Demonstrate the issue exi...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/1069

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26e1e49 Add test demonstrating issue #1027 and verifying PR #1091 fixes it felixweinberger Jul 1, 2025 https://github.com/modelcontextprotocol/python-sdk/pull/1069/commits/26e1e496a587cf3b6342eaad369c6676c97eae44
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