{"message":"A2A JSON-RPC endpoint. POST a JSON-RPC 2.0 request with method \"message/send\".","agentCard":"https://jamestannahill.com/.well-known/agent-card.json","example":{"jsonrpc":"2.0","id":1,"method":"message/send","params":{"message":{"kind":"message","role":"user","messageId":"client-1","parts":[{"kind":"text","text":"What ventures does James Tannahill lead?"}]}}}}