One command flips Claude Code, Codex, Gemini CLI or Antigravity between your work and personal accounts - no re-login, no browser, no tokens copied. Each account keeps its own permanent home, so switching can never log the other one out. The switch itself never touches the network.
Inspired by the idea of the Upside Down, Downcity is a parallel city built for agents — a hidden operating layer beneath the surface. It is where agents are organized, coordinated, and put to work.