Discoverability — agent readiness

The inventory layer: which URLs exist, which address is the authoritative one, and what a response says about itself before anything parses its body. These are the oldest and most widely adopted technologies we check, which is exactly why the failures here are implementation mistakes rather than gaps.

Scored

Detected and validated. Each page lists the checks that can fail it and on whose authority.

Canonical URL web baseline ► flat

Tells an agent which address is the real one for this page.

HTTP Link header web baseline ► flat

Relations declared in headers, readable without parsing the body.

XML sitemap web baseline ► flat

The URL inventory agents and crawlers use for discovery.

llms.txt early production ▲ rising

A hand-written Markdown index of a site's most useful pages, written for language models.