# 03 Sandbox Backend

Script: `example/03_sandbox_backend.py`.

This example treats `session.to(backend, spec=...)` as OpenRath's device placement operation. The same agent code can run against `local` or `opensandbox`.

```bash
python example/03_sandbox_backend.py
python example/03_sandbox_backend.py opensandbox
```

| Placement | Meaning |
| --- | --- |
| `spec=None` | Ephemeral workspace. |
| `spec="."` | Bind the repository directory as the sandbox workspace. |
| `backend.get(name).is_available()` | Checks local availability before running. |

The OpenSandbox variant also needs a running OpenSandbox stack and host bind permissions.

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