Mastra is the TypeScript agent framework designed to provide the essential primitives for building AI applications. It enables developers to create AI agents with memory and tool-calling capabilities, implement deterministic LLM workflows, and leverage RAG for knowledge integration.

Mastra's primary advantage is its built-in telemetry support that automatically captures agent interactions, LLM calls, and workflow executions, making it easy to monitor and debug AI applications.

:::frame
<img src="../img/apps/opik-documentation/documentation/fern/img/tracing/mastra_integration.png" alt="Mastra tracing">
:::

## Getting started

### Create a Mastra project

If you don't have a Mastra project yet, you can create one using the Mastra CLI:

```bash
npx create-mastra
cd your-mastra-project
```

### Install required packages

Install the necessary dependencies for Mastra observability:

```bash
npm install @mastra/observability @mastra/otel
```

### Add environment variables

Create or update your `.env` file with the following variables:

::::tabs
:::tab{title="Opik Cloud"}
```bash wordWrap
# Your LLM API key
OPENAI_API_KEY=<YOUR_OPENAI_API_KEY>

# Opik configuration
OPIK_API_KEY=<your-opik-api-key>
OPIK_WORKSPACE_NAME=<your-workspace>
OPIK_PROJECT_NAME=<your-project-name>
```
:::

:::tab{title="Enterprise deployment"}
```bash wordWrap
# Your LLM API key
OPENAI_API_KEY=<YOUR_OPENAI_API_KEY>

# Opik configuration
OPIK_API_KEY=<your-opik-api-key>
OPIK_WORKSPACE_NAME=<your-workspace>
OPIK_PROJECT_NAME=<your-project-name>
```
:::

:::tab{title="Self-hosted instance"}
```bash
# Your LLM API key
OPENAI_API_KEY=<YOUR_OPENAI_API_KEY>

# Opik configuration
OPIK_PROJECT_NAME=<your-project-name>
```
:::
::::

## Set up an agent

Create an agent in your project. For example, create a file `src/mastra/index.ts`:

::::tabs
:::tab{title="Opik Cloud"}
```typescript
import { Mastra } from "@mastra/core/mastra";
import { Observability } from "@mastra/observability";
import { OtelExporter } from "@mastra/otel";
import { PinoLogger } from "@mastra/loggers";
import { LibSQLStore } from "@mastra/libsql";
import { Agent } from "@mastra/core/agent";
import { openai } from "@ai-sdk/openai";

const OPIK_API_KEY = process.env.OPIK_API_KEY!;
const OPIK_WORKSPACE_NAME = process.env.OPIK_WORKSPACE_NAME!;
const OPIK_PROJECT_NAME = process.env.OPIK_PROJECT_NAME!;

export const chefAgent = new Agent({
  name: "chef-agent",
  instructions:
    "You are Michel, a practical and experienced home chef " +
    "You help people cook with whatever ingredients they have available.",
  model: openai("gpt-4o-mini"),
});

export const mastra = new Mastra({
  agents: { chefAgent },
  storage: new LibSQLStore({
    url: ":memory:",
  }),
  logger: new PinoLogger({
    name: "Mastra",
    level: "info",
  }),
  observability: new Observability({
    configs: {
      default: {
        serviceName: "chef-agent",
        exporters: [
          new OtelExporter({
            provider: {
              custom: {
                endpoint: "https://www.comet.com/opik/api/v1/private/otel/v1/traces",
                protocol: "http/json",
                headers: {
                  Authorization: OPIK_API_KEY,
                  "Comet-Workspace": OPIK_WORKSPACE_NAME,
                  projectName: OPIK_PROJECT_NAME,
                },
              },
            },
          }),
        ],
      },
    },
  }),
});
```
:::

:::tab{title="Enterprise deployment"}
```typescript
import { Mastra } from "@mastra/core/mastra";
import { Observability } from "@mastra/observability";
import { OtelExporter } from "@mastra/otel";
import { PinoLogger } from "@mastra/loggers";
import { LibSQLStore } from "@mastra/libsql";
import { Agent } from "@mastra/core/agent";
import { openai } from "@ai-sdk/openai";

const OPIK_API_KEY = process.env.OPIK_API_KEY!;
const OPIK_WORKSPACE_NAME = process.env.OPIK_WORKSPACE_NAME!;
const OPIK_PROJECT_NAME = process.env.OPIK_PROJECT_NAME!;

export const chefAgent = new Agent({
  name: "chef-agent",
  instructions:
    "You are Michel, a practical and experienced home chef " +
    "You help people cook with whatever ingredients they have available.",
  model: openai("gpt-4o-mini"),
});

export const mastra = new Mastra({
  agents: { chefAgent },
  storage: new LibSQLStore({
    url: ":memory:",
  }),
  logger: new PinoLogger({
    name: "Mastra",
    level: "info",
  }),
  observability: new Observability({
    configs: {
      default: {
        serviceName: "chef-agent",
        exporters: [
          new OtelExporter({
            provider: {
              custom: {
                endpoint: "https://<comet-deployment-url>/opik/api/v1/private/otel/v1/traces",
                protocol: "http/json",
                headers: {
                  Authorization: OPIK_API_KEY,
                  "Comet-Workspace": OPIK_WORKSPACE_NAME,
                  projectName: OPIK_PROJECT_NAME,
                },
              },
            },
          }),
        ],
      },
    },
  }),
});
```
:::

:::tab{title="Self-hosted instance"}
```typescript
import { Mastra } from "@mastra/core/mastra";
import { Observability } from "@mastra/observability";
import { OtelExporter } from "@mastra/otel";
import { PinoLogger } from "@mastra/loggers";
import { LibSQLStore } from "@mastra/libsql";
import { Agent } from "@mastra/core/agent";
import { openai } from "@ai-sdk/openai";

const OPIK_PROJECT_NAME = process.env.OPIK_PROJECT_NAME!;

export const chefAgent = new Agent({
  name: "chef-agent",
  instructions:
    "You are Michel, a practical and experienced home chef " +
    "You help people cook with whatever ingredients they have available.",
  model: openai("gpt-4o-mini"),
});

export const mastra = new Mastra({
  agents: { chefAgent },
  storage: new LibSQLStore({
    url: ":memory:",
  }),
  logger: new PinoLogger({
    name: "Mastra",
    level: "info",
  }),
  observability: new Observability({
    configs: {
      default: {
        serviceName: "chef-agent",
        exporters: [
          new OtelExporter({
            provider: {
              custom: {
                endpoint: "http://localhost:5173/api/v1/private/otel/v1/traces",
                protocol: "http/json",
                headers: {
                  projectName: OPIK_PROJECT_NAME,
                },
              },
            },
          }),
        ],
      },
    },
  }),
});
```
:::
::::

## Run Mastra development server

Start the Mastra development server:

```bash
npm run dev
```

Head over to the developer playground with the provided URL and start chatting with your agent.

## What gets traced

With this setup, your Mastra application will automatically trace:

- **Agent interactions**: Complete conversation flows with agents
- **LLM calls**: Model requests, responses, and token usage
- **Tool executions**: Function calls and their results
- **Workflow steps**: Individual steps in complex workflows
- **Memory operations**: Context and memory updates

## Validation

1. Run the Mastra dev server and execute one agent chat.
2. Confirm OTLP export requests are sent to your configured endpoint.
3. Verify the trace in Opik under the expected workspace/project.

## Source references

- [Mastra docs](https://mastra.ai/)
- [Mastra telemetry docs](https://mastra.ai/en/docs/observability/overview)
- [Opik OpenTelemetry overview](/guides/multi-language-opentelemetry)

## Further improvements

If you have any questions or suggestions for improving the Mastra integration, please [open an issue](https://github.com/comet-ml/opik/issues/new/choose) on our GitHub repository.

## Related pages

- [Observability for BeeAI (TypeScript) with Opik](./typescript-beeai-typescript.md)
- [Observability for LangChain (JavaScript) with Opik](./typescript-langchainjs.md)
- [Observability for Vercel AI SDK with Opik](./typescript-vercel-ai-sdk.md)

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