fix: validate if value is dict before recursion in _filter_to_supported_schema#2477
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dechantoine wants to merge 1 commit into
Open
fix: validate if value is dict before recursion in _filter_to_supported_schema#2477dechantoine wants to merge 1 commit into
dechantoine wants to merge 1 commit into
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Hey! 👋
This is a fix for #2476.
What changed: Added an isinstance(field_value, dict) guard in _filter_to_supported_schema before recursing into schema_field_names entries (specifically additionalProperties).
Why it crashed: The https://json-schema.org/understanding-json-schema/reference/object#additionalproperties allows additionalProperties to be either a boolean or a schema object. FastMCP (and other MCP SDKs) emit "additionalProperties": false by default, which triggered an AttributeError: 'bool' object has no attribute 'items'.
Testing: Verified against the repro script in the linked issue — old behavior is preserved for dict values, booleans now pass through correctly.
Happy to adjust if needed!
Antoine