Free tool · no signup · runs now
A2A agent card checker
The Agent Card is your agent's identity: name, skills, endpoint. The checker validates the same card the audit requires.
Part of the AI agent trust 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
Agent card valid: 3 skills, https endpointStatic example for A2A agent card checker; run the check above for your own result.What it checks
See whether your Agent Card identifies your site to other agents over https.
v1.0 required fields, endpoint in supportedInterfaces[0].url over https.
Reads the raw JSON only, never renders. Follows up to 5 redirects.
What good looks like
Good looks like a valid card naming your agent, its skills and an https endpoint in supportedInterfaces[0].url. Malformed cards fail; a missing file reports na.
How to fix it
Serve /.well-known/agent-card.json per section 4.4.1 with the endpoint in supportedInterfaces[0].url.
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: A2A protocol specification · 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 A2A agent card 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.