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Title: Return METHOD_NOT_FOUND for invalid request methods by raashish1601 · Pull Request #2372 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: Return METHOD_NOT_FOUND for invalid request methods by raashish1601 · Pull Request #2372 · modelcontextprotocol/python-sdk

X Title: Return METHOD_NOT_FOUND for invalid request methods by raashish1601 · Pull Request #2372 · modelcontextprotocol/python-sdk

Description: Fixes #1561. Summary return METHOD_NOT_FOUND for unknown JSON-RPC request methods instead of collapsing them into the generic request-validation INVALID_PARAMS fallback keep INVALID_PARAMS for malformed known methods by only special-casing method names that are outside the typed client request union add a focused regression proving invalid/method returns -32601 while malformed initialize still returns -32602 Testing PYTHONPATH=src python -m pytest -o addopts="" tests/issues/test_1561_invalid_method_names.py -q python -m ruff check src/mcp/shared/session.py src/mcp/server/session.py tests/issues/test_1561_invalid_method_names.py git diff --check

Open Graph Description: Fixes #1561. Summary return METHOD_NOT_FOUND for unknown JSON-RPC request methods instead of collapsing them into the generic request-validation INVALID_PARAMS fallback keep INVALID_PARAMS for mal...

X Description: Fixes #1561. Summary return METHOD_NOT_FOUND for unknown JSON-RPC request methods instead of collapsing them into the generic request-validation INVALID_PARAMS fallback keep INVALID_PARAMS for mal...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2372

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274581e Return method-not-found for unknown request methods raashish1601 Mar 28, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2372/commits/274581e730de861bc49f89346c3e7d950b465753
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