# ChatGPT (https://sellersheetai.com/docs/start/clients/chatgpt)

> Install the SellerSheet plugin in the ChatGPT desktop app — the skills and the MCP server together — or add the server on chatgpt.com, then connect with a browser sign-in.



In the ChatGPT desktop app, the SellerSheet plugin brings the skills **and** the MCP server in one step. Without the desktop app, chatgpt.com takes the server by URL, in developer mode.

## Prerequisites [#prerequisites]

* A SellerSheet account with a connected store — [Connect your store](/docs/start/connect).
* The ChatGPT desktop app. For chatgpt.com instead: a paid ChatGPT plan, because developer mode is available on paid plans.

## Step 1: Copy the SellerSheet MCP URL [#step-1-copy-the-sellersheet-mcp-url]

```text
https://sellersheetai.com/mcp
```

You won't paste it for the plugin: the plugin carries the server. You need it only on chatgpt.com.

## Step 2: Add SellerSheet in ChatGPT [#step-2-add-sellersheet-in-chatgpt]

In the desktop app, add the GitHub repository as a marketplace, then install the plugin from it:

1. Open **Plugins → Add → Add a marketplace**.

2. Enter the repository as **Source**, leave the other fields empty and select **Add marketplace**:

   ```text
   sellersheetai/sellersheet-skills
   ```

3. Select **+** (**Install plugin**) on the **SellerSheet** plugin.

**No desktop app?** On chatgpt.com (the server without the skills):

1. Open **Settings → Apps → Advanced settings** and turn on **Developer mode**.
2. Open **Workspace settings → Apps → Create**. Name it `SellerSheet`, paste `https://sellersheetai.com/mcp` as the **MCP Server URL** and set **Authentication** to **OAuth**.

## Step 3: Sign in and test [#step-3-sign-in-and-test]

1. In the desktop app, connect SellerSheet when prompted: your browser opens SellerSheet; click **Allow**, then start a new chat. On chatgpt.com, sign in to SellerSheet when the browser asks, click **Allow**, then enable it in a chat.
2. Ask: "Which stores can you see?" Your agent calls `get_user_context` and lists your store refs, such as <StoreRef />, with your plan and each store's status. Every session should start there.

## Troubleshooting [#troubleshooting]

### "Unauthorized" (401) [#unauthorized-401]

Your sign-in or key expired or was deleted. Sign in again, or create a new key.

### The browser never opens [#the-browser-never-opens]

Update the client — older versions don't support MCP sign-in — or use an [API key](/docs/mcp-api/keys).

### "No stores" [#no-stores]

Connect a store first: [Connect your store](/docs/start/connect).

More in [Troubleshooting](/help/troubleshooting/ai). Next: [Install the skills](/docs/start/skills), or [try the prompt library](/docs/start/prompts).