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Tool calling is when an AI decides it needs to use a helper tool—like a calculator or web search—and knows how to ask for it correctly.
The ability of an AI model to identify when it needs to use an external tool and generate the appropriate function call with parameters.
Tool calling (or function calling) is a capability where the LLM generates structured output matching a predefined tool/function schema. The model outputs a JSON object specifying the function name and arguments, which the runtime then executes. The result is fed back to the model for further reasoning.