Shopify has extended WebMCP support to checkout, allowing browser-based AI agents to complete purchases on Shopify merchants' sites. The company announced the move on Monday, saying the agents can now read the checkout screen, update it and submit the transaction with the buyer's authorisation, without relying on screenshots or scraping webpages.
The update adds three tools — get_checkout, update_checkout and complete_checkout — that let agents inspect a checkout, change things such as the customer's address or delivery option, and then place an order once the buyer authorises it. Shopify previously supported WebMCP for storefronts and carts, where agents could search inventory and add items to a cart.
The feature is rolling out to all eligible Shopify merchants, according to Gil Greenberg, a staff product manager working on agentic commerce at Shopify, who posted about it on X. Shopify already offers a hosted Model Context Protocol server for server-to-server agent work, while WebMCP is designed for agents operating inside the buyer's browser. Both use Shopify's Universal Commerce Protocol.
Greenberg wrote on X that agents operating in the buyer's browser should use the WebMCP tools on storefront and checkout to complete order placement, rather than navigating HTML built for humans. He said the tools provide structured APIs designed via UCP to ensure accurate commerce facts, required disclosures and handoff requirements.
The move contrasts with some retailers, including Amazon and Adidas, which the report says are blocking AI agents from making purchases on users' behalf. Top AI agents Muse and Instinct already have direct partnerships with Shopify for agentic commerce, with the Instinct partnership announced today.