{"transport":"JSONRPC","a2a":"POST JSON-RPC 2.0 here (or to /) — method: message/send","card":"/.well-known/agent-card.json","example":{"jsonrpc":"2.0","id":1,"method":"message/send","params":{"message":{"role":"user","kind":"message","messageId":"x","parts":[{"kind":"text","text":"hello cat"}]}}}}