Install the Decile MCP in ChatGPT

You can connect Decile to ChatGPT as a custom plugin, giving ChatGPT direct access to your Decile data so you can ask questions about your customers, orders, and personas right inside a chat. This article walks you through connecting the Decile MCP in ChatGPT and how to use it once it's installed.

Before you start

You'll need to turn on Developer Mode in ChatGPT. Developer mode is what lets you add a custom plugin like Decile.

Open your user settings in ChatGPT.
Go to Plugins.
Find Developer mode and toggle it on.

Step 1: Start adding a new plugin

Navigate to Plugins.
Click the plus sign (+) next to the search box to open the New Plugin form.

Step 2: Fill out the New Plugin form

Enter the following details:

Name: Decile
Description: Analyze ecommerce data
Connection: https://mcp.decile.com/mcp
Authentication: OAuth

Then accept the Custom MCP terms.

Step 3: Create the plugin

Click Create. ChatGPT will set up the plugin and prompt you to connect your account.

When prompted, sign in using your Decile login.
Review and accept the permissions requested.

Once you've signed in, you'll be redirected back to ChatGPT, where the Decile plugin will now show as installed.

Using the Decile plugin

There are two ways to put the plugin to work:

Ask a question naturally. Pose a question that would draw on your Decile data — for example, "How many customers did I have last quarter?" — and ChatGPT will use the Decile plugin to answer.
Call Decile directly. Type @Decile in your prompt to invoke the plugin explicitly for that question.

Frequently asked questions

Do I need developer mode turned on? Yes. Developer mode is required to add a custom plugin like Decile. If you don't see the option to add a plugin, check that developer mode is toggled on in your Plugins settings.

Do I need a Decile account? Yes. You'll sign in with your Decile login and accept the requested permissions to complete the connection.

How do I know it worked? After you sign in and accept permissions, you'll be returned to ChatGPT and the Decile plugin will appear as installed under your Plugins.

How do I use the plugin in a chat? Either ask a question that naturally uses your Decile data, or type @Decile in your prompt to call it directly.