Desktop, terminals, and ports

Nimbus exposes the most important sandbox surfaces directly in the app: shell terminals, a desktop tab, and previewable ports.

Terminals

Terminals run inside tmux on the sandbox. Use them for ad hoc commands, logs, and interactive development tools. Long-running servers should use stable tmux sessions so they survive UI reconnects.

Desktop

Desktop access uses a browser-accessible VNC session. It is useful when a task requires visual inspection, browser interaction, or a GUI application running inside the sandbox.

Preview ports

When a dev server listens on the sandbox, Nimbus exposes it through a secure preview URL. Bind web servers to 0.0.0.0; listeners bound only to localhost may not be reachable through the preview tunnel.

Common checks

Use these checks when a preview is not loading:

lsof -nP -iTCP:<port> -sTCP:LISTEN
curl -fsS http://127.0.0.1:<port>/

Confirm that the server is listening on the expected port and that it responds locally before debugging the tunnel.