Google has published six optional Merchant Center fields that tell its conversational surfaces what to know about a product. What each one carries, which to fill first, and the rule that keeps the feed from replacing the page: the values have to match.
In a recorded test on fictional storefronts, an AI shopping agent passed over the highest-rated shoe in five of five runs. Its specs were in an image. This Brief covers the structural floor under every discovery channel, and the free instrument that reads it.
Amazon shut Meta's Muse agent out and Shopify let it in, twelve days after quietly switching the channel on for roughly a million merchants. Both platforms made the same decision on behalf of every brand underneath them. What the default turned on, and what to do this week.
Google's holiday guidance tells retailers to optimize for people, not bots. Its other recommendations are all written for machines: richer product feeds, real-time price and inventory, agentic checkout. The contradiction resolves once you separate the surface layer from the infrastructure layer.
Fifteen minutes to a working commerce agent. The repository's own note hands authorization, business rules, and compliance back to the deployment, and that is the part that decides whether any of it should be running.
Think with Google told brands that foundational SEO remains the formula for AI search visibility. In the same article, DoorDash describes integrating 500,000 SKUs with merchant-level availability so Gemini knows what is actually in stock. The example refutes the headline.
For thirty years the cart was something you filled, one store at a time. Google's Universal Cart inverts that: the agent assembles it across every merchant that can answer its questions. There is no browsing phase to abandon. The cart is built from a brief.
Google's I/O announcements are not previews, they are production. The Universal Cart, the AP2 authorization layer, and UCP expansion are shipping to a billion AI Mode users. The launch merchant list is the first public ranking of which brands are inside the infrastructure.
Google found websites hiding instructions that tell AI agents to recommend them over competitors, with injection detections up 32 percent in three months. The integrity of agent recommendations is not guaranteed, and a verified agent can be compromised after authorization.
Treating agentic commerce as a subset of e-commerce is a category error. E-commerce is a channel; agentic commerce is a mediation model that operates across all of them. Brands that miss this optimize product pages while the layer that decides selection goes unbuilt.
