What do you need for UCP? There are two levels of UCP readiness. The first is the minimum viable manifest — the bare requirements to pass validation and appear in the UCP directory . The second is the agent-ready setup — what it actually takes for an AI agent to browse, cart, and check out at your store without friction. Think of this as your UCP checklist — the minimum requirements plus the recommended prerequisites that separate stores agents can find from stores agents can actually shop. Most guides only cover the first level. This one covers both, grounded in data from 4,024 verified merchants and hundreds of agent testing sessions . Minimum requirements (pass validation) These are the fields required to produce a valid UCP manifest on the current v2026-04-08 spec : 1. A JSON file at /.well-known/ucp The manifest must be publicly accessible at https://yourdomain.com/.well-known/ucp , served with Content-Type: application/json , and reachable without authentication.…