Inspector

The Inspector is a web UI for inspecting Sandbox Agent sessions. Use it to view events, inspect payloads, and troubleshoot behavior.

Open the Inspector

The Inspector is served at /ui/ on your Sandbox Agent server. For example, if your server runs at http://localhost:2468, open http://localhost:2468/ui/.

You can also generate a pre-filled Inspector URL from the SDK:

import { buildInspectorUrl } from "sandbox-agent";

const url = buildInspectorUrl({
  baseUrl: "http://127.0.0.1:2468",
});

console.log(url);
// http://127.0.0.1:2468/ui/

Features

• Session list
• Event stream view
• Event JSON inspector
• Prompt testing
• Request/response debugging
• Interactive permission prompts (approve, always-allow, or reject tool-use requests)
• Desktop panel for status, remediation, start/stop, and screenshot refresh
• Process management (create, stop, kill, delete, view logs)
• Interactive PTY terminal for tty processes
• One-shot command execution

When to use

• Development: validate session behavior quickly
• Debugging: inspect raw event payloads
• Integration work: compare UI behavior with SDK/API calls

Process terminal

The Inspector includes an embedded Ghostty-based terminal for interactive tty processes. The UI uses the SDK’s high-level connectProcessTerminal(...) wrapper via the shared @sandbox-agent/react ProcessTerminal component.

Desktop panel

The Desktop panel shows the current desktop runtime state, missing dependencies, the suggested install command, last error details, process/log paths, and the latest captured screenshot.

Use it to:

• Check whether desktop dependencies are installed
• Start or stop the managed desktop runtime
• Refresh desktop status
• Capture a fresh screenshot on demand