The Peristyle Grocery Cart is a custom connector for Meta's assistant. Send Muse one message, approve the sign-in it hands back, and it can find a real creator's recipe, match every ingredient to a product at your Kroger or Walmart, and fill the cart. You check out in the store's own app, the way you already do.
New message to Muse
Add my Peristyle Grocery Cart connector: https://mcp.peristyle.io/mcp
- Setup: standard MCP over HTTP with OAuth — send me the sign-in link and I'll approve it. Replies come as a stream, so move on as soon as your answer arrives.
- OAuth: register dynamically, no client ID or secret needed. Authorization server https://api.peristyle.io (authorize at /oauth/authorize, token at /oauth/token, register at /oauth/register), PKCE S256, no scopes. Discovery: https://mcp.peristyle.io/.well-known/oauth-protected-resource
- Skill: install the official one so every recipe, meal-plan or grocery question, including an Instagram or TikTok cooking video I share, goes through the Peristyle tools first — npx skills add https://github.com/peristyle-io/grocery-cart-skills --skill grocery-cart (if you can't install from a repo, save your own skill with the same rule: start with shop_recipe, never with the auth or connect tools. For a cooking video, pass its link to shop_recipe, then read the caption yourself and shop it. Walmart needs no store sign-in; only connect Kroger if I ask for Kroger by name.)There is no MCP screen to find. Muse reads the message, stands the connector up on its own machine, and saves it as a skill so it reaches for these tools the next time you mention dinner.
Muse sends back a sign-in link. Approving it is what gives the connector a session, and Muse keeps the credentials in its Secure Credentials Store rather than in the chat.
Meta does not review custom connectors, its own or anyone's. Ours reads recipes and writes carts. It never sees a card number: checkout happens in the grocer's app, not here.
From then on it is one sentence. Muse finds the recipe, matches every ingredient to a product on the shelf at your store, shows you the picks, and fills the cart once you say go.
Four things people actually ask it. Pick one to read the reply.
Greek Chicken Meatballs with Roasted Lemon Potatoes, Greek Salad, and Tzatziki, from Toscano's Table. Sixteen ingredients, and I found all sixteen at your Walmart. Six of them you already have.
via Peristyle Grocery Cart · Toscano's Table · Walmart
Checked your pantry first. Olive oil, garlic, oregano, and rice are marked in stock, so I left them out of the cart. Lemons you bought two weeks ago, so I am guessing they are gone and putting them back in.
via Peristyle Grocery Cart · Your pantry · Walmart
Swapped the store and rematched. Your Kroger on Vine Street has everything but the cotija, so I picked queso fresco in its place. The cart is waiting in the Kroger app for pickup Thursday.
via Peristyle Grocery Cart · Toscano's Table · Kroger, Vine Street
Toscano's Table wrote it, and the recipe came from her site rather than from me. Here is the link to the original. If you cook it often, I can watch for the rest of her weeknight run.
via Peristyle Grocery Cart · Toscano's Table
Recipes are real entries in the catalog. Products and prices are illustrative: what a match looks like, not a quote from either store.
Not a list of logos. This is the surface area Muse actually gets, and the counts are the real tool names behind each one.
Recipes4
Search the catalog, list what is there, pull a full recipe, and pull just its ingredient lines.
Matching5
Turn a recipe, or a loose list you typed, into real products on the shelf at either grocer. One call does the whole run.
Kroger8
Connect and disconnect an account, check the sign-in, find your nearest store, search the catalog, read a product, write the cart.
Walmart2
Search the catalog and hand back a cart link with everything already in it. No account to connect.
Pantry4
Opt in, opt out, read what is on the shelf, and update it after a shop. Off until you turn it on.
You7
Store, brand, and dietary preferences, past carts, a list to review before anything is bought, feedback on a bad match, and a way to delete the whole account.
Once the connector is saved as a skill, you can drop the preamble. These are written out in full so the first try works.
Weeknight
Using the Peristyle Grocery Cart, plan four weeknight dinners from Toscano's Table, skip anything in my pantry, and put the rest in my Walmart cart.
Pantry
Using the Peristyle Grocery Cart, turn on my pantry, mark that I have olive oil, garlic, rice, and oregano, then shop a shrimp recipe without them.
Preferences
Using the Peristyle Grocery Cart, remember that I am pescatarian, I prefer store brands, and I pick up from the Kroger nearest 45202.
Before you buy
Using the Peristyle Grocery Cart, show me the full shopping list with sizes and prices before you add anything, and flag any substitution you made.
These count what the connector is, not how it is doing. We publish measured numbers only, so there are no usage figures here until there are usage figures.
Peristyle Grocery Cart is a free hosted MCP server, published by Peristyle (peristyle.io), that lets an AI assistant turn a recipe into a ready-to-checkout grocery cart. Meta's Muse has no MCP settings screen and no built-in grocery connector; you connect one by sending Muse a message that names the server, and Muse builds a Custom Connector on its own machine and saves it as a skill. The server address is https://mcp.peristyle.io/mcp, a remote MCP server over streamable HTTP using OAuth 2.0. Steps: send Muse the setup message, approve the sign-in link it returns, then ask it for a recipe and a grocery run. It hands Muse thirty tools covering recipe search, ingredient matching, Kroger, Walmart, an opt-in pantry, and your shopping preferences. Walmart needs no store account and returns a cart link; Kroger uses a one-time OAuth connection and writes items straight to your cart. Connecting is free and there is no Peristyle subscription. Checkout always happens in the grocer's own app with your own payment method, and no order is placed without your approval. Every recipe carries the name of the creator who wrote it and links back to the original. The same connector works in Claude, ChatGPT, and any other MCP-capable assistant.