Definition
Proposed web standard enabling websites to expose structured tools to browser-based AI agents via document.modelContext.getTools and executeTool — avoiding HTML scraping for agentic interactions.
Key Points
- 2026-09-28: shopify adds checkout tools (
get_checkout,update_checkout,complete_checkout,navigate_to_storefront) implementing UCP checkout capability in-browser (2026-09-28-shopify-webmcp-checkout-changelog) - Complements server-side Checkout MCP for agents operating off-browser
- Requires explicit buyer authorization before
complete_checkout - Built on universal-commerce-protocol (UCP) shared checkout object model