Agentic browsing turns your website into another machine's interface.
In May 2026 Google added Agentic Browsing to Lighthouse (13.3) and turned it on by default; PageSpeed Insights has shown it ever since, alongside Performance, Accessibility, Best Practices and SEO. When Google dedicates an entire category to something, it's telling you where it's looking.
Browser-based assistants (ChatGPT, Claude, Perplexity, Copilot and the agents built into Chrome) already visit websites to complete tasks: comparing prices, filling in contact forms, booking and buying. If your website isn't operable by an agent, that customer doesn't bounce: they buy from your competitor's website, and the visit doesn't even show up in your classic analytics.
This is the second half of GEO. The first was getting AI to cite you when it answers; this one is getting its agents to act on your website when the user hands them the task. Both rest on the same foundation: machine-readable content, clean semantics and zero friction.