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    4 min

    Install and first run

    Most CLIs follow the same install pattern.

    Every coding CLI follows the same three steps. Examples below.

    Three steps

    1
    Install
    npm install -g @anthropic-ai/claude-code   # Claude Code
npm install -g @openai/codex               # Codex CLI
brew install antigravity                   # Antigravity CLI (Google, Go)
pip install aider-chat                     # aider
brew install cursor                        # Cursor (editor)
    2
    Authenticate
    claude          # opens browser login
codex           # opens browser login
aider           # reads OPENAI_API_KEY / ANTHROPIC_API_KEY env var
    One-time per machine. Most CLIs use OAuth; aider uses env vars.
    3
    First prompt
    cd ~/my-project && claude
    Try: "What does this project do?"
    No Node.js installed?
    Get it from nodejs.org (LTS). Or use Homebrew (macOS) / your distro's package manager (Linux).

    Exit with Ctrl+C twice or /exit. Most CLIs let you resume the last session — check --continue or similar.