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Title: fix: support PEP 604 structured output unions by he-yufeng · Pull Request #2592 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: fix: support PEP 604 structured output unions by he-yufeng · Pull Request #2592 · modelcontextprotocol/python-sdk

X Title: fix: support PEP 604 structured output unions by he-yufeng · Pull Request #2592 · modelcontextprotocol/python-sdk

Description: Summary wrap FastMCP structured output annotations with Pydantic's explicit (annotation, ...) field form add regression coverage for dict | list | str return annotations Fixes #2591. To verify uv run pytest tests\server\mcpserver\test_func_metadata.py -q --basetemp .tmp\pytest -p no:cacheprovider uv run ruff check src\mcp\server\mcpserver\utilities\func_metadata.py tests\server\mcpserver\test_func_metadata.py uv run ruff format --check src\mcp\server\mcpserver\utilities\func_metadata.py tests\server\mcpserver\test_func_metadata.py git diff --check

Open Graph Description: Summary wrap FastMCP structured output annotations with Pydantic's explicit (annotation, ...) field form add regression coverage for dict | list | str return annotations Fixes #2591. To verif...

X Description: Summary wrap FastMCP structured output annotations with Pydantic's explicit (annotation, ...) field form add regression coverage for dict | list | str return annotations Fixes #2591. To v...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2592

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cc2e919 fix: wrap structured union outputs explicitly he-yufeng May 14, 2026 https://github.com/modelcontextprotocol/python-sdk/pull/2592/commits/cc2e919e6da17539f810e6aca66c0447165d1c9b
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