> ## Documentation Index
> Fetch the complete documentation index at: https://docs.less.tech/llms.txt
> Use this file to discover all available pages before exploring further.

# ChatGPT desktop

> Add Less to ChatGPT as a custom MCP connector.

ChatGPT connects to Less as a **custom connector** over MCP. Once added, ChatGPT
can search your workspace, analyze tables, trace lineage, and check job health.

<Note>
  You need a Less API key first. See [Get a bearer token](/mcp/api-key).
</Note>

## How ChatGPT differs from Claude

ChatGPT uses the connected MCP server **directly** - it doesn't take a separate
uploaded "skill" the way Claude does. You don't need the GitHub download here.
The Less server ships its own built-in guidance (how to resolve ids, respect
result caps, drill into failures, and run assets safely), so ChatGPT follows the
right workflow from the connector alone.

<Tip>
  Want to steer it further? Paste the highlights from the
  [Less skill](https://github.com/LessTechRepo/skills) into a ChatGPT
  **Project**'s custom instructions. It's optional - the server guidance already
  covers the essentials.
</Tip>

## Add the connector

<Steps>
  <Step title="Enable connector/developer settings">
    In ChatGPT, open **Settings → Connectors**. Adding a custom MCP server
    requires enabling **Developer mode** (under **Settings → Connectors →
    Advanced**).
  </Step>

  <Step title="Add Less as a custom connector">
    Choose **Add custom connector** (MCP) and enter:

    * **Name:** `Less`
    * **URL:** `https://<your-workspace-host>/api/mcp` (default host
      `app.less.tech`)
  </Step>

  <Step title="Authenticate">
    For authentication, provide your API key as a bearer token:

    ```http theme={null}
    Authorization: Bearer <YOUR_API_KEY>
    ```

    Paste it into the access-token / API-key field, or as a custom
    `Authorization` header, depending on your ChatGPT version.
  </Step>

  <Step title="Save and enable">
    Save the connector and enable it. The Less tools become available in the
    composer (look under the tools / connectors menu in a chat).
  </Step>
</Steps>

## Try it

In a chat with the Less connector enabled, ask:

```
Which five customers had the highest revenue last quarter?
```

```
What feeds the revenue_daily model, and what breaks if I change it?
```

ChatGPT resolves the assets through Less, runs the analysis, and links back to
the app. It will only start a run if you explicitly ask it to.

<Note>
  Custom MCP connectors are available on ChatGPT's paid plans, and exact labels
  vary by version. If you can't find Developer mode, check OpenAI's current
  connector documentation for your plan.
</Note>


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