How the UCP flow works: catalog search, /.well-known/ucp profile, MCP cart, buyer handoff
schwentker · x · 2026-11-16
A diagram walkthrough of the UCP agentic commerce flow: the agent searches a Shopify catalog (336 hits for "waterproof commuter backpack"), reads the shop's profile at /.well-known/ucp, builds a $190 cart via the shop's MCP endpoint using createcart/updatecheckout tools, then hands off to the buyer to finish checkout in a browser. The handoff is the part to watch — stay in the loop.
Related event: Inside UCP: How Merchants and Buyer Agents Complete Agentic Shopping(2 posts)→
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