/tools/meta crawls a single URL, parses the HTML, and lays out every meta tag and element it finds, grouped by namespace:

• Standard — description, keywords, viewport, theme-color, canonical, alternates, robots.
• OpenGraph — og:title / og:description / og:image / og:url / og:type / article: / book: / profile:.
• Twitter — twitter:card / twitter:site / twitter:creator / twitter:title / twitter:description / twitter:image.
• Facebook — fb:app_id and friends.
• http-equiv — Content-Security-Policy, refresh, etc.
• link — preload, prefetch, dns-prefetch, manifest, stylesheet, alternate languages.

Useful when debugging social share previews, auditing canonical / alternate hreflang coverage, or just sanity-checking what a page actually exposes. Pure parser — no rendering, no JS execution.