Second brain, third brain, lizard brain, bird brain; all these different brains. Here-uh-brain, there-uh-brain, everywhere-uh-brain-brain. What actually IS a brain? Like I’m five, please. Why are they useful? Do people actually use them practically? What’s the big hoop-la about brains?

Google just quietly dropped a massive update to Lighthouse (v13.3) by adding a brand new "Agentic Browsing" audit category. SEO is no longer just about optimizing for human users and basic search engine crawlers now, we have to build for AI agents that navigate, read, and execute actions on our sites. Lighthouse is now tracking "Agentic Readiness" by checking your accessibility tree, your llms.txt file, and whether your layout shifts (which breaks coordinate-based AI browsing). I made a short video breaking down what this means for the future of GEO (Generative Engine Optimization) and how to run this audit right now. The official Google docs are here for the curious: https://goo.gle/lighthouse-agentic-web

Pure no-fluff truth.

Anyone has gone through it? it looks really juicy