John Mueller, a Google search advocate, explained in a reply on Bluesky that Google Search Console’s new generative AI report counts impressions in response to a question about what is recorded when a site appears in AI previews and AI mode.
This question is for anyone looking at the new report and wondering why its impression count is lower than the number of AI responses it believes it appears in. Mueller explains that an impression is counted when a link to your page is displayed, but if a user has to open a link first, it only counts as an impression after doing so.
Mueller answered four questions from Nicola Agius, director of SEO and discovery at Reach PLC, regarding the report that Google began testing this month with a select group of UK sites:
“Impressions are based on links to your site shown in AI previews/AI mode. I don’t know if just a favicon would link, but if it links to a page on your site, it would count. If something needs to be ‘activated’ to see the link, it would only count when users do so.”
Agius had asked whether a brand icon on a combined map counted when the item was not visible, and whether an icon counted when a site was grouped but not shown in the main feed. Mueller’s response addresses the principle behind both. The trigger is a link to a page, not the presence of your brand. He said he wasn’t sure if a single favicon would be linked, so this case remains open.
What the documentation says
Google’s help page for the report defines an impression as the number of times a link to your site appears to a user in a generative AI feature of Google Search. However, it does not clarify specific cases mentioned by Agius, such as combo cards, clusters, or links requiring activation. His answer temporarily fills this gap until the official documentation is updated.
Why it matters
The activation point can help explain why your AI visibility appears lower in the report compared to live results. Because a link only counts once when a user expands it, some page appearances you see are never recorded as impressions.
This also adds to what the report can’t tell you yet. The launch shipped without click dataand Mueller has already stated that all links within an AI overview share a single position. For now, impressions are the available metric, and that’s how they are counted.
Looking to the future
Mueller did not answer one of Agius’ questions regarding whether total impressions include posts on X. The favicon issue is still unresolved.
The report is still in limited testing before a wider rollout, and Google has said it plans to add additional metrics over time. Until the literature addresses these cases, Mueller’s response provides the clearest understanding of what the count includes.
Featured Image: Take it easy/Shutterstock
