Observability and Tracing for Vercel AI SDK in Next.js and Node.js

import { openai } from '@ai-sdk/openai';
import { generateText, stepCountIs, tool } from 'ai';
import { getTracer } from '@lmnr-ai/lmnr';
import { z } from 'zod';

const result = await generateText({
  model: openai('gpt-5-mini'),
  system:
    'You are a concise travel assistant. Call tools to look up weather and local time before answering.',
  prompt:
    'I have meetings in Paris and Tokyo tomorrow. What is the weather and local time in each city right now?',
  tools: {
    weather: tool({
      description: 'Get the current weather for a city.',
      inputSchema: z.object({ city: z.string() }),
      execute: async ({ city }) => {
        const res = await fetch(`https://wttr.in/${encodeURIComponent(city)}?format=j1`);
        const data = await res.json();
        const c = data.current_condition[0];
        return { tempC: Number(c.temp_C), condition: c.weatherDesc[0].value };
      },
    }),
    timezone: tool({
      description: 'Get the current local time for a city.',
      inputSchema: z.object({ city: z.string() }),
      execute: async ({ city }) => {
        const res = await fetch(
          `https://timeapi.io/api/time/current/zone?timeZone=${encodeURIComponent(
            `Europe/${city}`,
          )}`,
        );
        return res.ok ? await res.json() : { error: 'unknown city' };
      },
    }),
  },
  stopWhen: stepCountIs(5),
  experimental_telemetry: {
    isEnabled: true,
    tracer: getTracer(),
    functionId: 'travel-assistant',
    metadata: { env: 'production' },
  },
});

console.log(result.text);
console.log(`Completed in ${result.steps.length} steps`);

import { openai } from '@ai-sdk/openai';
import { ToolLoopAgent, stepCountIs } from 'ai';
import { getTracer } from '@lmnr-ai/lmnr';
import { weather, timezone } from './tools';

const travelAgent = new ToolLoopAgent({
  model: openai('gpt-5-mini'),
  instructions:
    'You are a concise travel assistant. Call tools to look up weather and local time before answering.',
  tools: { weather, timezone },
  stopWhen: stepCountIs(5),
  experimental_telemetry: {
    isEnabled: true,
    tracer: getTracer(),
    functionId: 'travel-agent',
  },
});

const result = await travelAgent.generate({
  prompt: 'Weather and local time in Paris and Tokyo?',
});