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Record metadata
type: "Glossary term"
title: "Function calling"
description: "A model emitting a tool invocation against a declared function schema."
tags: [glossary]
generated: { by: human:crpage, at: 2026-07-09T09:44:00Z }
aliases: "function calling; function call; tool calling"
status: stable

Definition

A model generating a tool invocation against a declared function schema — a vendor-native abstraction, the bridge from natural language to external systems.

Used in this bundle

Appears in: structured-outputs, openai.

Related terms

api calling, tool use, structured output.