TechCrunch reports that Shopify has extended WebMCP support from storefront browsing and cart-building into checkout itself. The company says browser-based AI agents can now read the checkout screen, update it, and submit a transaction with the buyer's authorization, using structured APIs instead of screenshots or HTML scraping.
The update introduces three tools: get_checkout, update_checkout, and complete_checkout. Together they let an agent inspect a checkout, change details such as the customer's address or delivery option, and place the order once the buyer has authorized it. The feature is rolling out to all eligible Shopify merchants, according to Gil Greenberg, a staff product manager at Shopify who works on agentic commerce, who announced the change on X.
WebMCP for checkout builds on Shopify's existing hosted Model Context Protocol server, which supports server-to-server agent activity, and on the proposed WebMCP standard for agents running inside a buyer's browser. Both rely on Shopify's Universal Commerce Protocol (UCP), which standardizes product search, cart-building and checkout across agent types.
Shopify's move contrasts with other retailers: the source notes Amazon and Adidas are currently blocking AI agents from completing purchases on their platforms. Shopify's agent partners Muse and Instinct already integrate directly with the platform for agentic commerce, with the Instinct partnership announced the same day as the checkout update.