A2A Server

import { A2AServer } from '@cogitator-ai/a2a';
import { a2aExpress } from '@cogitator-ai/a2a/express';
import { Agent, Cogitator } from '@cogitator-ai/core';
import express from 'express';

const apiKey = process.env.GOOGLE_API_KEY;
if (!apiKey) throw new Error('Set GOOGLE_API_KEY');

const PORT = 3100;

const writingAssistant = new Agent({
  name: 'writing-assistant',
  description: 'Improves text, suggests edits and answers questions about writing.',
  model: 'google/gemini-3.5-flash-lite',
  instructions: 'You are a professional writing assistant. Keep responses concise and actionable.',
  temperature: 0.5,
  maxIterations: 3,
});

const a2a = new A2AServer({
  agents: { 'writing-assistant': writingAssistant },
  cogitator: new Cogitator({ llm: { providers: { google: { apiKey } } } }),
  cardUrl: `http://localhost:${PORT}`,
});

const app = express();
app.use(a2aExpress(a2a));

app.listen(PORT, () => {
  console.log(JSON.stringify(a2a.getAgentCard(), null, 2));
  console.log(`Agent card:   http://localhost:${PORT}/.well-known/agent.json`);
  console.log(`RPC endpoint: http://localhost:${PORT}/a2a`);
});

pnpm add @cogitator-ai/a2a @cogitator-ai/core express

GOOGLE_API_KEY=your-key npx tsx a2a-server.ts

npx tsx examples/a2a/01-a2a-server.ts