fix(tools): handle Union[ModelA, ModelB] in FunctionTool._preprocess_args#5813

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devteamaegis:fix/function-tool-union-pydantic-conversion

Commits on May 22, 2026

fix(tools): handle Union[ModelA, ModelB] in FunctionTool._preprocess_args
devteamaegis
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test(tools): add Union[ModelA, ModelB] regression tests for _preprocess_args
devteamaegis
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