Free tool · no signup · runs now
Link discovery checker
Agents find your API and Markdown through Link headers, not by guessing URLs. The checker reads the same headers the audit requires.
Part of the AI agent discovery checker group — also included in the free full scan.
Checks site-wide files at the domain root — any page URL on the domain gives the same result.
One free scan · anonymous preview · sign in to save the full report
Link: api-catalog and markdown alternate presentStatic example for Link discovery checker; run the check above for your own result.What it checks
See whether agents can discover your API and Markdown from your homepage headers.
Link headers for api-catalog, text/markdown alternate, describedby pointing at llms.txt.
Reads the no-JS response only, never runs JS. Follows up to 5 redirects.
What good looks like
Good looks like Link headers on the homepage naming your api-catalog and Markdown alternate — agents follow headers rather than guessing URLs. A homepage with no Link headers fails; an unreachable homepage reports na.
How to fix it
Add Link headers on the homepage: an api-catalog plus a text/markdown alternate.
What the full scan adds
- All 34 checks in one pass — one URL, every category, a single report.
- Evidence on every row: the values found, why it fails, the fix, and a deep link per check.
- Your score against the global distribution — see where you stand.
- Sign in and the report is kept for 1 year; anonymous reports expire after 7 days.
Official source: RFC 8288, Web Linking · Rule: agent-readiness v1 · checker library
Tracking a Google update? Run the update impact check or read the search update radar.
Frequently asked questions
Is the Link discovery checker free?
Yes — one free run without an account, with an anonymous preview. Sign in to save the full report and keep the evidence.
How often should I run it?
After every deploy that touches routing, templates or the checked file — and after each Google core update, to confirm nothing regressed.
Does the check run JavaScript?
No — it reads the no-JS response only, exactly what a crawler or AI agent sees when it fetches the URL.
How is this different from a full audit?
This page runs one check with its full criteria and fix notes. The free full scan runs every category at once and keeps the evidence per URL — use it once you know which checks matter.