tool-use

Function calling and tool integration

Topics

Agent patternsAn agent is an LLM that works in a loop: it decides what to do, uses tools, observes the results, and continues until the task is done. Agents suit open-ended tasks whose steps cannot be…
Model Context Protocol (MCP)MCP is an open protocol for connecting AI applications to tools and data. A service builds one MCP server; any MCP-capable client (Claude, ChatGPT, IDEs, coding agents, custom agents) can use it.…
Tool use (function calling)Tool use lets a model call functions you define: search a database, call an API, run code, edit files. The model does not run anything itself. It returns a structured request (tool name plus JSON…

ReAct: Synergizing Reasoning and Acting in Language Modelspaper · Yao et al. (Princeton, Google Research) · 6 October 2022
The 2026-07-28 MCP specificationrelease · Model Context Protocol maintainers · 21 May 2026