# Copies and second opinions

A copy is a separate branch where an AI tries a change without touching your main code. When done, keep it or throw it away, after a second opinion from another AI if you like.

Use one for anything you are unsure about: a large refactor, an experiment, or two AIs trying the same task different ways.

## Before you start [#before-you-start]

- A running <Term id="studio">Studio</Term> and at least one AI ready to open (Klarety AI always is). See [How the AI harness works](/docs/ai-harness).
- A second opinion needs a second AI, for example Klarety AI and your own Claude Code.

## Start an AI on a copy [#start-an-ai-on-a-copy]

<Steps>
<Step>
### Open the AI menu [#open-the-ai-menu]
In the Studio's **AI** tab, select **+** (**Open an AI tool**).
</Step>
<Step>
### Choose Git Worktree [#choose-git-worktree]
Select **Git Worktree**, then the AI that should work on the copy.
</Step>
<Step>
### Work as usual [#work-as-usual]
The AI opens in a new tab named after the tool and the copy, with a bar showing **Copy** and its name. Everything it changes stays in the copy.
</Step>
</Steps>

<Screenshot src="/docs/_media/klarety-code-ai-session.png" alt="An AI working on a copy, with the copy's bar" />

You can also start a copy from an open tab's menu, with **Git Worktree**.

## Ask for a second opinion [#ask-for-a-second-opinion]

<Steps>
<Step>
### Open Hand over [#open-hand-over]
In the copy's bar, select **Hand over**.
</Step>
<Step>
### Choose a reviewer [#choose-a-reviewer]
Under **Ask for a second opinion**, choose another AI.
</Step>
<Step>
### Send the review [#send-the-review]
The other AI opens on the same copy with a request already typed: review the copy's changes against the main branch and point out bugs, risks and anything missing. Press Enter to send.
</Step>
</Steps>

<Screenshot src="/docs/_media/klarety-code-ai-session.png" alt="The Hand over menu on a copy's bar, with Ask for a second opinion" />

To let another AI carry on the work instead, choose it under **Continue this copy with**.

## Keep or throw away a copy [#keep-or-throw-away-a-copy]

Open **Your terminal** from **Open an AI tool**, or any Studio terminal, and run one of these with your copy's name:

```bash
ai-harness copy keep <copy>
```

Merges the copy into your main code. If both changed the same lines, the merge stops so you can resolve the conflict.

<Callout type="warn" title="Drop cannot be undone">
Dropping a copy removes its folder and branch. Keep it first if you might want the work.
</Callout>

```bash
ai-harness copy drop <copy>
```

Removes the copy's folder and branch. Your main code is unchanged.

The copy's bar shows its name, and the information icon beside it repeats both commands.

## Next steps [#next-steps]

- [Work together](/docs/ai-harness/working-together)
- [Code review with Buddy](/docs/projects/buddy)
- [How the AI harness works](/docs/ai-harness)