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Title: fix: preserve stdio streams in server transport by pranjalbhatia710 · Pull Request #2734 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: fix: preserve stdio streams in server transport by pranjalbhatia710 · Pull Request #2734 · modelcontextprotocol/python-sdk

X Title: fix: preserve stdio streams in server transport by pranjalbhatia710 · Pull Request #2734 · modelcontextprotocol/python-sdk

Description: Summary duplicate the process stdin/stdout file descriptors before wrapping them for the stdio server transport close only the duplicated wrapper streams on shutdown, preserving the original process-level streams extend the stdio regression test to assert the original sys.stdin/sys.stdout wrappers remain usable after the server exits Fixes #1933 Test plan uv run --frozen pytest tests/server/test_stdio.py -q uv run --frozen ruff check src/mcp/server/stdio.py tests/server/test_stdio.py uv run --frozen pyright src/mcp/server/stdio.py tests/server/test_stdio.py

Open Graph Description: Summary duplicate the process stdin/stdout file descriptors before wrapping them for the stdio server transport close only the duplicated wrapper streams on shutdown, preserving the original proce...

X Description: Summary duplicate the process stdin/stdout file descriptors before wrapping them for the stdio server transport close only the duplicated wrapper streams on shutdown, preserving the original proce...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2734

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fix: preserve stdio streams in server transport https://github.com/modelcontextprotocol/python-sdk/pull/2734/files#top
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ee4f98d fix: preserve stdio streams in server transport pranjalbhatia710 May 31, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2734/commits/ee4f98dc16db40fea93a369673413857116a3cee
7787d46 fix: support fileno-less stdio streams pranjalbhatia710 Jun 3, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2734/commits/7787d46397c61467cffd79b71656ab2af515d554
cd2acc8 fix: keep fileno-less stdio wrappers open pranjalbhatia710 Jun 4, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2734/commits/cd2acc8c05d6efa394b646af1acfd191ec9690c5
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