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Title: test(mcpserver): cover PEP 604 union return annotations (#2591) by Bartok9 · Pull Request #2906 · modelcontextprotocol/python-sdk · GitHub

Open Graph Title: test(mcpserver): cover PEP 604 union return annotations (#2591) by Bartok9 · Pull Request #2906 · modelcontextprotocol/python-sdk

X Title: test(mcpserver): cover PEP 604 union return annotations (#2591) by Bartok9 · Pull Request #2906 · modelcontextprotocol/python-sdk

Description: The official Python SDK for Model Context Protocol servers and clients - test(mcpserver): cover PEP 604 union return annotations (#2591) by Bartok9 · Pull Request #2906 · modelcontextprotocol/python-sdk

Open Graph Description: Summary Adds a regression test for tool functions whose return annotation is a multi-member PEP 604 union mixing container and scalar types (dict | list | str). Guards an already-fixed-but-unteste...

X Description: Summary Adds a regression test for tool functions whose return annotation is a multi-member PEP 604 union mixing container and scalar types (dict | list | str). Guards an already-fixed-but-unteste...

Opengraph URL: https://github.com/modelcontextprotocol/python-sdk/pull/2906

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FastMCP crashes when tool return type uses Python 3.10+ A | B | C union syntax https://github.com/modelcontextprotocol/python-sdk/issues/2591
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