# Agent

The engine for Agent jobs, and the default mode.

Under "Agent", choose the engine (Codex or Claude Code) and the default mode for jobs. The modes appear under the names each CLI gives them.

| Engine | Investigate only | Can write |
|---|---|---|
| Claude Code | Plan (allows only the tools for reading) | Auto |
| Codex | Read Only (a read-only sandbox) | Approve for me (a sandbox that can write to the workspace) |

In Auto and Approve for me, whenever the CLI would ask a person, its automatic review makes the call and the job carries on. In Codex, actions that need the network or anything outside the workspace go to this review.

![The Agent page in the settings](https://asist-agent.com/screens/en/settings-agent.webp)