UCP Catalog Capability

Before writing code

Fetch live spec: Web-search site:ucp.dev specification shopping catalog and fetch the capability page plus its search and lookup operation pages. The Product/Variant schema and filter vocabulary evolve between spec versions — read the live schema before writing types.

Conceptual Architecture

What Catalog is for

Catalog is the discovery half of UCP, upstream of Cart and Checkout. It covers free-text product search, category and filter-based browsing, batch retrieval by identifier, and price comparison across variants. Without it, an agent can only transact against items it already knows the IDs for.

Two operations