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Title: fix: buffer stdio server writes during progress notifications by 2830500285 · Pull Request #2654 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: fix: buffer stdio server writes during progress notifications by 2830500285 · Pull Request #2654 · modelcontextprotocol/python-sdk

X Title: fix: buffer stdio server writes during progress notifications by 2830500285 · Pull Request #2654 · modelcontextprotocol/python-sdk

Description: Summary buffer the server stdio write stream by one message so a handler can queue its final response while stdout is still flushing an earlier notification add a regression test covering a slow notification write followed by a response send Fixes #1141. Validation uv run --frozen --no-sync pytest tests/server/test_stdio.py tests/shared/test_progress_notifications.py -q uv run --frozen --no-sync ruff format --check src/mcp/server/stdio.py tests/server/test_stdio.py uv run --frozen --no-sync ruff check src/mcp/server/stdio.py tests/server/test_stdio.py uv run --frozen --no-sync pyright src/mcp/server/stdio.py tests/server/test_stdio.py Note: local uv run --frozen sync attempted to fetch the git dependency strict-no-cover, but GitHub fetches for that dependency were failing from this machine. I used the already-synced virtualenv with --no-sync for the targeted checks above.

Open Graph Description: Summary buffer the server stdio write stream by one message so a handler can queue its final response while stdout is still flushing an earlier notification add a regression test covering a slow n...

X Description: Summary buffer the server stdio write stream by one message so a handler can queue its final response while stdout is still flushing an earlier notification add a regression test covering a slow n...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2654

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bfe2be0 fix: buffer stdio server writes during progress notifications 2830500285 May 21, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2654/commits/bfe2be0e30f4f8a11918f1b5c1d9e034b5698cbd
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