tl;dr: bigarrow is a MIT-licensed macOS CLI tool (with Claude Code/Codex skill integration) that lets AI agents draw transparent arrows, boxes, and labeled signs over any window to point users at UI elements—useful for permission prompts, 2FA, OAuth consent, or guided tutorials where the agent can't or shouldn't click itself. Clicks pass through, focus stays put, arrows auto-expire, and no Screen Recording/Accessibility permissions are needed for basic drawing. Written in Swift as a single binary with no daemon or telemetry, targeting elements by label, coordinates, window, or Peekaboo ID.