The answer
It allows you to force the model to either call a specific function, call any function, or ignore all functions.
Understanding OpenAI Function Calling and Tool Use
What is tools_choice parameter?
More FAQs in Understanding OpenAI Function Calling and Tool Use
No, the model only tells you *which* function to call and with *what* arguments. You must run the code on your server.
The model uses the function and parameter descriptions to understand when it should call the function and what data it needs.
Yes, modern models support Parallel Function Calling, allowing them to suggest multiple tool calls in a single turn.
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