Build XMTP agents

# Create a folder for your agent code
mkdir my-agent
cd my-agent
 
# Initialize a new project with ES module support
npm init --init-type=module -y
 
# Install TypeScript as development dependency (-D)
npm i -D typescript
 
# Install tsx to run TypeScript files directly
# without a separate build step
npm i -D tsx
 
# Install Node.js type definitions
# to enable TypeScript support for built-in APIs
npm i -D @types/node

import { Agent, getTestUrl } from '@xmtp/agent-sdk';
 
// 2. Spin up the agent
const agent = await Agent.createFromEnv({
  env: 'dev', // or 'production'
});
 
// 3. Respond to text messages
agent.on('text', async (ctx) => {
  await ctx.conversation.sendText('Hello from my XMTP Agent! 👋');
});
 
// 4. Log when we're ready
agent.on('start', () => {
  console.log(`Waiting for messages...`);
  console.log(`Address: ${agent.address}`);
  console.log(`🔗 ${getTestUrl(agent.client)}`);
});
 
await agent.start();

XMTP_WALLET_KEY=0x # the private key of the wallet
XMTP_DB_ENCRYPTION_KEY=0x # encryption key for the local database
XMTP_ENV=dev # local, dev, production

Prompt: lets create an example that gets a number and returns its 2x multiple (use claude max)