Install with npm install -g @raytrace-cli/cli@latest. Check raytrace --version is 0.4.0 or newer. Run raytrace auth login, sign in with your email and password in the browser, approve CLI access, and return to the terminal. Run cd demo_repo, then raytrace sandbox create --name demo_repo. When the sandbox is running, use raytrace connect <sandbox-id>. Claude Code comes installed: run claude inside the sandbox. Sign in to Claude Code if prompted. Browser and agent screens are illustrative.