Google puts AI Performance Insights into Merchant Center and expands its Universal Commerce Protocol before the holiday rush

Google published a set of Merchant Center and Shopping ads updates aimed at the coming holiday season, and grouped them under the label "agentic commerce". The post is dated 16 September 2026 and covers three product changes plus a set of feed guidance for retailers.

AI Performance Insights, now generally available

The AI Performance Insights view inside Merchant Center is now available to all retailers in Australia, Canada, India, New Zealand and the United States. Google says it "gives retailers a clear view of how their brand and products are being discovered by comparing their share of voice with other brands" across Google surfaces, including AI Mode and AI Overviews. That is the AI-search analytics view retailers have been asking for since AI Overviews launched: a Google-native read of whether a brand's products are surfacing in the AI answer, and a comparison against other brands in the same category.

Business Agent, inside YouTube ads

A beta of the Business Agent lets a shopper "ask complex product questions, and receive tailored guidance without leaving their YouTube context" from inside a video ad. Google says a test with Lululemon incorporated conversational attributes into recommendations "50% of the time in relevant product recommendations in AI Mode", though that figure describes the AI Mode test rather than the YouTube one.

Universal Commerce Protocol gets cart transfer and checkout testing

Google's Universal Commerce Protocol, its integration hub for retailer stacks, adds cart transfer to a merchant site and enhanced checkout flow testing. Rollout begins in the United States and expands to Australia and Canada in early 2027. UCP Analytics is now visible in the Merchant Center console, with more analytics "coming soon" per Google.

Loyalty programme integration is also expanding: retailers can send loyalty membership data so Google can surface member-specific prices and benefits in shopping surfaces.

What Google is claiming, and what it is not

The one performance number Google states is that merchants adopting Merchant Center feed best practices see "a 5% increase in conversions the following month" on average. Google is the source, so treat it as the vendor's own reading. The Lululemon figure describes a test setup rather than a rate to plan against.

The Business Agent inside YouTube ads and the loyalty integration are shopper-facing changes that a retailer opts into rather than a change to how organic search behaves. The UCP work is where the checkout side of an AI-mediated purchase actually lands: a retailer that has treated agentic commerce as a category to watch can now write and test the flow end to end, at least in the launch countries.

Source

Google, Get shoppers ready to buy with AI-powered agentic commerce.