# How the AI harness works

Every <Term id="studio">Studio</Term> comes with **Klarety AI**, an AI that knows Klarety. Beside it, each person can bring the coding tool they already pay for (**Claude Code**, **Codex** or **Cursor**) with their own subscription. Together they are the <Term id="ai-harness">**AI harness**</Term>.

Use Klarety AI for your data, your own tool for the coding style you know, and hand work between them.

<Screenshot src="/docs/_media/studio-ai-chat.png" alt="The AI tab inside a project's Studio" caption="The AI tab in a Studio." />

## What you get [#what-you-get]

| AI | Sign-in | Where it works |
| --- | --- | --- |
| Klarety AI | None. It comes with every Studio. | Every Studio, ready at once. |
| Claude Code | Your own Claude Code subscription. | Every Studio you open, after you sign in once. |
| Codex | Your own Codex subscription. | Every Studio you open, after you sign in once. |
| Cursor | Your own Cursor subscription. | Every Studio you open, after you sign in once. |

Each reaches your Klarety data through the built-in [Klarety MCP](/docs/ai-harness/mcp), with your own access and never more.

## Sign in once, use it everywhere [#sign-in-once-use-it-everywhere]

Sign in to your tool once, in your own terminal in a Studio. The sign-in then follows you to every <Term id="project">project</Term>.

It is encrypted with your own key, kept outside the Studio, and opened only where you are working now. Nobody else in your <Term id="workspace">workspace</Term> can use it, not even someone in the same Studio. See [Your sign-in stays yours](/docs/ai-harness/privacy).

A tool runs in one project at a time. Open it in a second and the Studio offers **Move here**.

## The AI tab [#the-ai-tab]

In the Studio, the **AI** tab shows your **AI tools** as tabs:

- **Klarety** is Klarety AI.
- **Open an AI tool** (the **+** button) lists the AIs you can open, and **Your terminal**. A tool you have not signed in to yet shows **Sign in**.
- A tab that needs your answer shows **Waiting for you**.

Closing a tab does not stop the tool. Reopen it from **+** to pick up where it left off.

## Working with other people [#working-with-other-people]

Several people can work in one Studio on the same code, each with their own AI, session and subscription. See [Work together](/docs/ai-harness/working-together).

## Trying a change safely [#trying-a-change-safely]

Any AI can work on a **copy**, a separate branch that leaves your main code as it is. Keep it or throw it away, after a second opinion from another AI if you like. See [Copies and second opinions](/docs/ai-harness/copies).

## What a workspace admin controls [#what-a-workspace-admin-controls]

<Callout type="info" title="Admins only">
Only a workspace Owner or Admin can allow or disallow tools.
</Callout>

Admins turn people's own AI tools on or off for the whole workspace, in <AppLink to="settings.organization" /> under **AI tools**. A disallowed tool shows "Your workspace does not allow" and cannot be opened. Klarety AI is always available.

## Next steps [#next-steps]

- [Klarety AI](/docs/ai-harness/klarety-ai)
- [Claude Code](/docs/ai-harness/claude-code)
- [Codex](/docs/ai-harness/codex)
- [Cursor](/docs/ai-harness/cursor)