Use CartSorted with an AI assistant

CartSorted answers one question: where should I do this shop? Connect your AI assistant and it can compare your grocery list across the major supermarkets in your country, plan the week’s meals, and hand each store’s share of the shopping to that store’s own cart.

MCP server

CartSorted runs a Model Context Protocol (MCP) server. One address works for every country:

https://cartsorted.com/api/mcp

• Transport: streamable HTTP, POST only.
• Sign-in: OAuth 2.1. Your assistant sends you to CartSorted’s own consent page; it never sees your password. You need a CartSorted account.
• Country: prices are compared for the country of the postcode saved in your CartSorted settings. Tell your assistant your postcode and it saves it, or save one on your country’s site below.
• Connected with the old address, https://www.openorder.bot/api/mcp? It still works; there is nothing to change.

In ChatGPT and Claude, basket comparisons, product prices and cart links show as cards in the chat.

What you can ask

• “Which supermarket is cheapest for milk, bread, eggs, chicken and rice?”
• “How much is a 2kg bag of rice at each store?”
• “Which supermarkets do you compare in my country?”
• “Suggest a cheap dinner for Wednesday and add it to my plan.”
• “Turn this week's meal plan into cart links for each store.”

ChatGPT

Connect to ChatGPT

CartSorted is not in ChatGPT’s plugin directory yet, and ChatGPT cannot fill in a connector from a link. The button copies the MCP server address and opens ChatGPT’s Plugins page. Then:

1. If there is no + on that page, open Settings, then Security and login, and turn on Developer mode.
2. Press +, name it CartSorted and paste the address as the MCP server URL. Sign in on CartSorted’s consent page and press Allow.
3. Install it from your personal plugins, then start a new chat and type @ to pick it.

Claude

In Claude, open Customize, then Connectors, add a custom connector and enter the MCP server address above. In Claude Code, run:

claude mcp add --transport http cartsorted https://cartsorted.com/api/mcp

Then type /mcp, choose cartsorted and sign in.

In Claude Code you can install the CartSorted plugin instead. It connects the same server and adds skills for finding the cheapest store, planning the week’s shop and getting started:

claude plugin marketplace add LukeDurrant/cartsorted-plugin
claude plugin install cartsorted@cartsorted

Then type /mcp in a session, choose the cartsorted server and sign in.

Other assistants

Any app that supports remote MCP servers with OAuth can use the same address. Apps without a sign-in flow can use a personal key: sign in on your country’s site and open “Use CartSorted with AI” in the account menu.

What the tools do

• list_stores: The supermarkets compared in your country, and which of them trade where you are. A store not listed is not covered.
• set_postcode: Save your postcode, which sets the country and stores you are priced in.
• compare_basket: Which store is cheapest for a list of groceries, and what to buy where.
• search_product: One product's price and unit price at each store.
• list_recipes: Recipes from your library, by name, tag or ingredient.
• get_weekly_menu: This week's menu of cheap meals, built around real specials.
• get_meal_plan: What you have planned for a week.
• suggest_meals: Ideas for what to cook next, and why each was picked.
• add_to_plan: Add a recipe to a day of your meal plan.
• remove_from_plan: Take a meal off your meal plan. Your assistant asks first.
• set_shop_day: Set the day you do the week's shop, which decides the specials your plan can use.
• get_shopping_list: The priced shopping list for your meal plan, store by store.
• get_cart_handoff: The stores' own cart links for your list: split across the cheapest stores, or all at one.

Supermarkets covered

CartSorted compares only the stores listed here. An assistant should call list_stores rather than rely on this page, and should say so plainly when a store is not covered.

What an assistant must not do

• Never ask for or enter a supermarket password, verification code or payment details.
• Never check out. Cart links open in the shopper’s own browser, where they review the cart and pay themselves.
• Never quote a price, total or saving the tools did not return.
• Never name a store as covered unless the tools list it.

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