getting-started-doc

Reference documentation for getting started with Claude Code -- installation on macOS, Linux, Windows, and WSL, quickstart walkthrough, authentication (Claude Pro/Max/Teams/Enterprise/Console/cloud providers), credential management, system requirements, updates, uninstallation, the agentic loop, built-in tools, sessions, checkpoints, and permission modes. Use when answering questions about installing, setting up, logging in, or understanding how Claude Code works.