AI Agent2026-05-17
Tool Use
Also known as: Tool Use / ツール利用 / ツール呼び出し
LLM ability to invoke external functions by emitting structured JSON — Anthropic's term for what OpenAI calls Function Calling.
Overview
The model receives tool definitions (name, description, JSON schema) with the prompt. When it decides a tool is needed, it emits a structured call; the host executes and feeds results back.
MCP standardises tool definitions across hosts. Tool Use is the foundation of every production agent loop.
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