Mobile-friendly meta tag
Your pages should have a viewport meta tag and responsive layout.
The viewport tag
The viewport meta tag is the single line that tells browsers to render your site at the device's actual width instead of pretending to be a 960px desktop. Without it, mobile renders a zoomed-out desktop page.
<meta name="viewport" content="width=device-width, initial-scale=1">
Why AI crawlers care
AI crawlers generally render at mobile widths, following the same mobile-first convention Google adopted years ago. A page that breaks on mobile breaks for the crawler too — important text may be hidden behind horizontal scroll and never extracted.