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Glossary · Learn more

Tool

An action can take, such as reading a file or running a command. See what it is, how it works, how it is used and what to watch for, with pictures and examples.

Back to the glossary Claude Code
An open purple toolbox with a magnifying glass, pencil, terminal block and globe, linked by a loop arrow to a thought bubble.

What it is

A tool is an action can take in . Without tools, Claude can only answer with text. With tools, it can read and edit files, search , run commands, look things up on the web and start . Each time Claude uses a tool, the result comes back and helps it decide the next step.

How it works

  1. You describe the task
  2. Claude picks a tool to use
  3. The tool returns a result
  4. Claude decides the next step

How to use it

  1. Read, Edit, Write

    read a file, change part of it, or create a new one.

  2. Bash

    runs shell commands such as tests, builds and .

  3. WebSearch, WebFetch

    searches the web and fetches pages such as documentation.

  4. Agent

    starts a subagent with its own to handle a side task.

Watch out

Some tools, such as Bash and Edit, ask for your in Manual mode, and you can set rules for each tool by its exact name in your settings. To add new tools you connect an , while a does not add a new tool and runs through the existing Skill tool.

Original and official docs

This page explains the term in plain words. The original is the authority: if they differ, follow the original.