Building an app

Create your own in-chat app with the GreatStore MCP and a coding agent.

Custom apps are for things specific to your store that the pre-installed set doesn't cover: a size finder, a bundle builder, a custom collection view.

There is no in-dashboard app editor. Apps are built by connecting the GreatStore MCP to a coding agent (Claude Code, Codex, or whatever agent you use) and asking it to create apps for your store. The MCP itself teaches the agent what GreatStore apps are and how to publish them. MCP access for agents has the connection steps.

1

Connect the MCP

Follow MCP access for agents to add the GreatStore MCP to your coding agent.

2

Ask the agent to build

Describe the app you want. The agent creates it through the MCP; it appears on the Apps screen as a DRAFT.

You can also ask it to pull your existing apps, including the pre-installed ones, and modify them. See App library.

3

Preview

Click the app's card in Apps to see it rendered the way a shopper will.

4

Publish

Ask the same agent to publish it (or use the Apps screen). It goes LIVE and the assistant can start using it.

If your app loads scripts or calls APIs on other origins, add those hosts under Security first; the storefront CSP blocks them otherwise.