fix: handle boolean MCP schema leaves#2563
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Fixes #2393.
_filter_to_supported_schema()recursively filters MCP JSON Schema input before converting it to a Gemini tool declaration. JSON Schema allows boolean values foradditionalProperties, and FastMCP/Pydantic schemas commonly emitadditionalProperties: false. The current recursion assumes every nested schema value is a dict and calls.items(), so those valid schemas crash withAttributeError: 'bool' object has no attribute 'items'.This keeps scalar schema leaves as-is before recursing into dictionaries, then adds MCP conversion coverage for a nested object with
additionalProperties: false.To verify
UNITTEST_ON_FORGE=1 python -m pytest google/genai/tests/mcp/test_mcp_to_gemini_tools.py -qpython -m py_compile google/genai/_mcp_utils.py google/genai/tests/mcp/test_mcp_to_gemini_tools.py