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The Vercel AI SDK emits ai.* spans natively. Wire an OTel exporter pointing at Agnost, then enable telemetry per call with userId / sessionId.

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1. Install

Already have @opentelemetry/sdk-node (or another OTel SDK) and @opentelemetry/exporter-trace-otlp-proto? Skip: you only need the existing packages. No OTel set up yet? 
npm install @opentelemetry/sdk-node @opentelemetry/exporter-trace-otlp-proto

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2. Wire the OTel exporter pointing at Agnost

Already exporting OTel? Append Agnost as an additional span processor on your existing TracerProvider: 
import { BatchSpanProcessor } from '@opentelemetry/sdk-trace-base';
import { OTLPTraceExporter } from '@opentelemetry/exporter-trace-otlp-proto';

provider.addSpanProcessor(
  new BatchSpanProcessor(
    new OTLPTraceExporter({
      url: 'https://otel.agnost.ai/v1/traces',
      headers: { 'X-Agnost-Org-ID': process.env.AGNOST_ORG_ID! },
    }),
  ),
);
No OTel yet? Boot a NodeSDK at startup (e.g. Next.js instrumentation.ts): 
import { NodeSDK } from '@opentelemetry/sdk-node';
import { OTLPTraceExporter } from '@opentelemetry/exporter-trace-otlp-proto';

new NodeSDK({
  traceExporter: new OTLPTraceExporter({
    url: 'https://otel.agnost.ai/v1/traces',
    headers: { 'X-Agnost-Org-ID': process.env.AGNOST_ORG_ID! },
  }),
}).start();

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3. Pass userId / sessionId per call

import { generateText } from 'ai';

await generateText({
  model: openai('gpt-4o'),
  prompt: 'Hello',
  experimental_telemetry: {
    isEnabled: true,
    metadata: {
      userId: 'user-42',
      sessionId: 'conv-abc123',
    },
  },
});
experimental_telemetry.isEnabled defaults to false: set it per call.

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References