A2A (Agent-to-Agent)

import { A2AAdapter, Agent } from "jsr:@vibesjs/sdk";
import { anthropic } from "npm:@ai-sdk/anthropic";

// The agent being exposed
const researchAgent = new Agent({
  model: anthropic("claude-haiku-4-5-20251001"),
  systemPrompt: "You are a research assistant. Answer factual questions concisely and accurately.",
});

// Wrap with A2AAdapter
const adapter = new A2AAdapter(researchAgent, {
  name: "Research Agent",
  description: "Answers factual research questions",
  url: "http://localhost:8000",
  version: "1.0.0",
});

// Start the HTTP server
Deno.serve({ port: 8000 }, adapter.handler());
console.log("A2A server running on http://localhost:8000");
console.log("Agent card available at: http://localhost:8000/.well-known/agent.json");

// A2A client - plain fetch with JSON-RPC 2.0

const response = await fetch("http://localhost:8000/", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    jsonrpc: "2.0",
    method: "message/send",
    id: "req-1",
    params: {
      message: {
        role: "user",
        parts: [{ kind: "text", text: "What year was the Eiffel Tower built?" }],
      },
    },
  }),
});

const { result } = await response.json();

// The response contains an A2ATask with artifacts
const text = result.artifacts?.[0]?.parts?.[0]?.text;
console.log("Agent response:", text);
// "The Eiffel Tower was built in 1889..."