const response = await agent.streamText("What's the weather like in San Francisco?");

for await (const chunk of response.fullStream) {
  switch (chunk.type) {
    case "text-delta":
      process.stdout.write(chunk.textDelta); 
      break;
    case "tool-call":
      console.log(`Using tool: ${chunk.toolName}`);
      break;
    case "tool-result":
      console.log(`Tool completed: ${chunk.toolName}`);
      break;
    case "finish":
      console.log(`Done! Tokens used: ${chunk.usage?.totalTokens}`);
      break;
  }