AI Product Index / A2A card at the 1.0 path

A2A card at the 1.0 path

A2A reached 1.0 and the card moved to /.well-known/agent-card.json. A spec-compliant client never looks at the old path, so a site serving only the old one is invisible to exactly the clients that implemented the spec properly.

3
of 122 points
2.5%
of the total grade
2026
checklist generation

Does this apply to your site?

For sites offering an A2A agent service. Publish only capabilities you actually provide.

This score measures coverage of a published technical checklist. It does not measure AI visibility, referrals, content understanding or successful agent tasks. Optional service interfaces may not apply to your site; missing them still affects this fixed checklist.

How to address it when relevant

A2A 1.0 reads /.well-known/agent-card.json; /.well-known/agent.json is the pre-0.3 path a 1.0 client never looks at. Serve the same document at both while the installed base catches up.

Check your own site

Free, no signup, same endpoint that produced every grade on the leaderboard:

curl "https://index.percall.dev/api/score?url=https://your-site.example"

It returns the letter grade and every check by name with pass/fail. The $0.05 call at POST /api/audit adds why each one failed and a snippet with your origin already in it.

The rest of the checklist

6 more 2026 checks, and 13 from the other generation.