Function calling explained: the 4-step loop behind every coding agent
Al_Grigor · x · 2026-09-13
A beginner-friendly breakdown of function calling in four steps: (1) define tools with schemas (name, purpose, parameters, types) so the LLM picks tools; (2) the LLM only proposes calls with arguments, never executing code; (3) your system runs the function and returns results; (4) the LLM integrates output and may chain more calls until the task completes. Coding agents build code reading/editing on this loop.
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