npm install @mastra/koa koa koa-bodyparser

import Koa from 'koa';
import bodyParser from 'koa-bodyparser';
import { MastraServer } from '@mastra/koa';
import { mastra } from './mastra';

const app = new Koa();
app.use(bodyParser());

const server = new MastraServer({ app, mastra });

await server.init();

app.listen(3000, () => {
  console.log('Server running on http://localhost:3000');
});

// Routes added after init() have access to Mastra context via ctx.state
app.use(async ctx => {
  if (ctx.path === '/health' && ctx.method === 'GET') {
    const mastraInstance = ctx.state.mastra;
    const agents = Object.keys(mastraInstance.listAgents());
    ctx.body = { status: 'ok', agents };
  }
});

const server = new MastraServer({
  app,
  mastra,
  prefix: '/api/v2', // Route prefix
  openapiPath: '/openapi.json', // OpenAPI spec endpoint
  bodyLimitOptions: {
    maxSize: 10 * 1024 * 1024, // 10MB
    onError: err => ({ error: 'Payload too large' }),
  },
  streamOptions: { redact: true }, // Redact sensitive data from streams
});