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Title: fix: reject initialize protocol version conflicts by he-yufeng · Pull Request #2639 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: fix: reject initialize protocol version conflicts by he-yufeng · Pull Request #2639 · modelcontextprotocol/python-sdk

X Title: fix: reject initialize protocol version conflicts by he-yufeng · Pull Request #2639 · modelcontextprotocol/python-sdk

Description: Summary reject initialize requests when the mcp-protocol-version header conflicts with initialize.params.protocolVersion keep initialize requests without the protocol-version header on the existing compatibility path move existing initialize session-id validation behind a small helper to keep the POST handler readable Fixes #2618 To verify .\.venv\Scripts\python.exe -m pytest tests\shared\test_streamable_http.py -q -k "protocol_version" .\.venv\Scripts\python.exe -m ruff check src\mcp\server\streamable_http.py tests\shared\test_streamable_http.py .\.venv\Scripts\python.exe -m ruff format --check src\mcp\server\streamable_http.py tests\shared\test_streamable_http.py .\.venv\Scripts\pyright.exe src\mcp\server\streamable_http.py tests\shared\test_streamable_http.py git diff --check upstream/main..HEAD

Open Graph Description: Summary reject initialize requests when the mcp-protocol-version header conflicts with initialize.params.protocolVersion keep initialize requests without the protocol-version header on the existin...

X Description: Summary reject initialize requests when the mcp-protocol-version header conflicts with initialize.params.protocolVersion keep initialize requests without the protocol-version header on the existin...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2639

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c0dfcb3 fix: reject initialize protocol version conflicts he-yufeng May 18, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2639/commits/c0dfcb3ce96d2f6f23d6847b38661c5d2873e09e
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