Step 9 — Universal Commerce Protocol

Advanced Agentic Commerce: Ship the Full Agent Surface — lesson 11 of 20 (DEFINITION)

/.well-known/ucp must answer 200 with protocol_version, services, capabilities, and endpoints — and a real version string, not a placeholder. Every spec URL and schema you reference has to be reachable, or the validator marks the field invalid.

Source: UCP Specification

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