Shopify now allows artificial intelligence agents in the browser to read, modify and complete checkouts in stores on the platform using WebMCP. The new feature, announced on Monday (28), expands the infrastructure previously launched for catalog and cart and allows an agent to follow virtually the entire purchase, from product discovery to order confirmation.
The new features operate directly on the checkout open in the buyer's session. The agent can query the state of the purchase, fill in or change compatible fields and, after user confirmation, submit the checkout to create the order.
Shopify made four tools available at this stage: get_checkout, to query the checkout and completed order data; update_checkout, to update information such as contact, delivery, coupons and payment; complete_checkout, to finalize the purchase; and navigate_to_storefront, which returns the user to the store.
The process still requires human participation in sensitive steps. The buyer must confirm the order before completion and regains control of the page when actions such as 3D Secure authentication, Shop Pay login or interaction with checkout extensions.
The tools use the same state of the checkout interface already opened by the user. According to Shopify, the implementation does not create a new API nor require additional configuration from merchants.
WebMCP reduces reliance on simulated clicks
WebMCP is a proposed standard to allow pages to register structured tools directly in the browser. Instead of interpreting a website's visual code and simulating clicks, a compatible agent can discover these tools and execute actions with defined parameters and responses.
Shopify had already activated WebMCP tools in August for product search, navigation, cart management and checkout initiation on Liquid storefronts, in addition to the preview for Hydrogen. Agent support is still limited to Chromium-based browsers, through an origin trial.
Automated checkout also has limitations. Shopify does not register the tools in some flows, including B2B checkout, embedded checkout, mobile SDKs, draft orders and purchases with products from more than one store. In the standard three-page checkout, the feature requires the buyer to use Shop Pay.
