Grounding LLMs: How Function Calling Makes AI Actionable

Function calling enables LLMs to move beyond text generation and interact with external systems by invoking defined APIs or functions based on user input. The post explains the concept, walks through how it works with a structured JSON output example, and provides a complete Python tutorial using OpenAI's GPT-4 to build an email filtering system that automatically archives promotional emails and stars personal or work-related ones.