Keyboard shortcuts

Press ← or → to navigate between chapters

Press S or / to search in the book

Press ? to show this help

Press Esc to hide this help

Claude Code

Claude Code is Anthropic’s official CLI for Claude.

Features

  • Tool Execution — Read, write, and execute commands
  • Build/Plan Modes — Toggle between full execution and read-only
  • Multiple Models — Opus 4.5, Sonnet 4.5
  • 200K Context — Large context window

Models

ModelBest For
Opus 4.5Complex reasoning, architecture
Sonnet 4.5Balanced performance (default)

Build vs Plan Mode

  • Build Mode (default) — Full capabilities
  • Plan Mode — Read-only analysis, no file modifications

Toggle with Tab or Ctrl+4.

Tools Available

  • Read — Read file contents
  • Write — Create or overwrite files
  • Edit — Modify existing files
  • Bash — Execute shell commands
  • Glob — Find files by pattern
  • Grep — Search file contents

Installation

npm install -g @anthropic-ai/claude-code