sandbox-agent/docs/inspector.mdx
Nathan Flurry 6f66f92e72 fix: prevent permission reply from silently escalating "once" to "always"
Remove allow_always from the fallback chain when the user replies "once",
aligning with the ACP spec which says "map by option kind first" with no
fallback for allow_once. Also fix Inspector to use rawSend, revert
hydration guard to accept empty configOptions, and handle respondPermission
errors by rejecting the pending promise.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-03-10 21:52:31 -07:00

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1.5 KiB
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---
title: "Inspector"
description: "Debug and inspect agent sessions with the Inspector UI."
---
The Inspector is a web UI for inspecting Sandbox Agent sessions. Use it to view events, inspect payloads, and troubleshoot behavior.
<Frame>
<img src="/images/inspector.png" alt="Sandbox Agent Inspector" />
</Frame>
## 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:
```typescript
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)
- 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.