Fix TypeError when instantiating ChatCompletionMessageToolCallParam due to typing.Union #1419
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This fixes the error "TypeError: Cannot instantiate typing.Union" that happens in recent openai-python versions (e.g., 1.99.3+). The param type is a Union, so it can't be created directly. Changed to use a dict, which works with the API.
Tested with my own agent code that was failing—now it runs fine without downgrading openai.
Related to openai/openai-python issues like #2529 or #2541 (if they exist; I couldn't find exact matches, but similar problems reported).
Thanks!