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Function calling lets an AI model tell your program which function to run and what data to pass to it.
A mechanism where AI models generate structured function invocations that can be executed by external systems. Often used interchangeably with tool calling.
Function calling is the API-level capability where an LLM provider accepts function/tool definitions as part of the request schema, and the model can respond with structured function call outputs instead of (or alongside) text. The calling application executes the function and returns results to the model.