Function Calling — The ability for an AI model to output structured JSON that calls external functions or APIs. Instead of just generating text, the model decides which tool to use, what parameters to pass, and interprets the result. The foundation of AI agent tool use. Supported by GPT-4, Claude, Gemini.
Why It Matters
Understanding Function Calling is critical for developers and decision-makers working with AI systems. As the technology evolves rapidly, knowing these fundamentals separates informed decisions from costly mistakes.
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