流式调用

const stream = agent.stream({
  prompt: '北京今天天气怎么样？',
})

for await (const event of stream) {
  switch (event.type) {
    case 'text-delta':
      process.stdout.write(event.textDelta)
      break
    case 'tool-call':
      console.log(`\n调用工具: ${event.toolCalls.map(t => t.function.name).join(', ')}`)
      break
    case 'step':
      console.log(`\n步骤 ${event.step}`)
      break
    case 'finish':
      console.log('\n完成！')
      break
  }
}