> ## Documentation Index
> Fetch the complete documentation index at: https://docs.agnost.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Mastra

> Capture traces from Mastra agents with the Observability + OtelExporter API

Mastra ships an `OtelExporter` that targets any OTLP endpoint. Wire it into your Mastra instance, then pass `userId` / `conversationId` per call.

## 1. Install

**Already have `@mastra/observability` and `@mastra/otel-exporter`?** Skip.

**No Observability set up yet?**

```bash theme={null}
npm install @mastra/observability @mastra/otel-exporter
```

## 2. Wire the OtelExporter pointing at Agnost

**Already have Mastra Observability?** Append Agnost to the existing `exporters` array: Mastra fans traces out to every exporter in the list:

```typescript theme={null}
import { OtelExporter } from '@mastra/otel-exporter';

const agnostExporter = new OtelExporter({
  provider: {
    custom: {
      endpoint: 'https://otel.agnost.ai/v1/traces',
      headers: { 'X-Agnost-Org-ID': process.env.AGNOST_ORG_ID! },
      protocol: 'http/protobuf',
    },
  },
});

// Inside your existing Observability config:
exporters: [
  // ...your existing exporters,
  agnostExporter,
]
```

**No Observability yet?** Full setup:

```typescript theme={null}
import { Mastra } from '@mastra/core';
import { Observability } from '@mastra/observability';
import { OtelExporter } from '@mastra/otel-exporter';

export const mastra = new Mastra({
  agents: { agent },
  observability: new Observability({
    configs: {
      default: {
        serviceName: 'my-mastra-app',
        exporters: [
          new OtelExporter({
            provider: {
              custom: {
                endpoint: 'https://otel.agnost.ai/v1/traces',
                headers: { 'X-Agnost-Org-ID': process.env.AGNOST_ORG_ID! },
                protocol: 'http/protobuf',
              },
            },
          }),
        ],
      },
    },
  }),
});
```

## 3. Pass userId / conversationId per call

```typescript theme={null}
await agent.generate('Hello', {
  tracingOptions: {
    metadata: {
      userId: 'user-42',
      conversationId: 'conv-abc123',
    },
  },
});
```

Reserved keys `userId`, `conversationId`, and `threadId` in `tracingOptions.metadata` are read by Agnost for user / session grouping.

## References

* [Enable OpenTelemetry export](https://mastra.ai/docs/observability/tracing/exporters/otel)
* [Add custom metadata](https://mastra.ai/docs/observability/tracing/overview)