Chapter 1. Claude Code CLI Installation Guide

1.1 What is Claude Code CLI? A command-line tool that lets you direct an AI to write code using natural language, right from your terminal. It is a separate program from Claude.ai in the web browser, and is launched with the claude command after installation. 1.2 Prerequisites Item Requirement Operating System Windows 10+, Ubuntu 20.04+, macOS 10.15+ Account Claude Pro / Max / Teams / Enterprise (free plan not supported) Internet Required for installation and use RAM / Disk 4GB+ / 500MB+ Install