Shopify opened checkout on its platform, including Shop Pay, to any AI agent running in a shopper’s browser, enabling the agents to find and buy items on the shopper’s behalf (with their consent) without the shopper clicking through to the store themselves. The move comes just a week after Shopify struck a deal with Meta to let its AI agent Muse check out with Shop Pay on any Shopify store.
Couldn’t they already do that before?
Not quite. Shopify introduced WebMCP support on its storefronts in August, and since then, agents have been able to search a store, fill a cart, and take the shopper to checkout, but the shopper still had to complete the purchase themselves. Now, three new tools — get_checkout, update_checkout, and complete_checkout — let the agents read the checkout, change the shipping address or pick a different delivery option, and place the order once the buyer approves. (Coming soon: regret_checkout and don’t_tell_my_wife_checkout.)
This means any agent that supports WebMCP, not just Muse, can participate. No other major platform I’m aware of has opened its doors so wide to AI agents yet.
What’s actually happening behind the scenes?
When I first read the news, I thought it meant that no one (neither human nor agent) was actually visiting Shopify stores anymore, and that agents were pulling products straight from the merchant’s catalog and completing transactions strictly via API — but that’s not the case. That kind of connection runs on regular MCP, where an agent talks to a server directly in the cloud and never loads the store, which is how Muse finds products through Shopify Catalog.
WebMCP, on the other hand, works inside the shopper’s own browser. The store’s page still loads, but instead of the agent guessing where to click, the page hands it a menu of actions it can call by name, all within the shopper’s logged-in session.
Is it live? Can I use it now?
WebMCP is still a draft standard backed by engineers at Google and Microsoft, and it’s only in testing in Chrome so far, with Google saying Gemini in Chrome will be the first major agent to use it “soon.” Shopify’s stores are ready for agents to check out, but most agents can’t take advantage of it yet. For now it’ll still just be companies hiring Filipinos to pretend to be AI agents and doing the checkout on your behalf.
