Your AI-built Next.js 16 landing page looks fine. Its link preview might not: 6 metadata traps and the prompts that fix them

<p>An AI-built Next.js 16 landing page can look perfect in your browser while its link previews, <code>robots.txt</code>, and sitemap still point at <code>localhost:3000</code>, lose their image on every subpage, or show up as a blank card. Here are six metadata traps, each checked on a real build, with a fix and a prompt you can paste into Cursor, Claude Code, or ChatGPT.</p> <p>The examples come

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