# Observability for Hermes with Opik

[Hermes](https://github.com/NousResearch/hermes-agent) can send trace data to Opik through the plugin package [`opik-hermes`](https://github.com/comet-ml/opik-hermes).

This integration captures:

- A root trace per agent turn, organized by Hermes `session_id`
- LLM spans (`type=llm`): messages, assistant output, model/provider, token usage, and USD cost
- Tool spans (`type=tool`): tool arguments and results

## Prerequisites

- The [Hermes](https://github.com/NousResearch/hermes-agent) agent framework installed.
- Opik project/workspace details (for cloud or enterprise deployments).

## Setup

::::steps{titleSize="h3"}
:::step{title="1. Install the plugin"}
```bash
pip install opik-hermes
```

Installing the package automatically registers the plugin with Hermes.
:::

:::step{title="2. Enable the plugin"}
Add `opik` to the enabled plugins in `~/.hermes/config.yaml`:

```yaml
plugins:
  enabled: [opik]
```
:::

:::step{title="3. Configure Opik credentials"}
Set the Opik environment variables in `~/.hermes/.env`.

For a local open-source Opik deployment:

```bash
OPIK_URL_OVERRIDE=http://localhost:5173/api
OPIK_PROJECT_NAME=hermes
```

For Comet-hosted Opik:

```bash
OPIK_API_KEY=your-api-key
OPIK_WORKSPACE=your-workspace
```
:::
::::

## Validate setup

Run a Hermes chat session and verify traces appear in the configured Opik project dashboard.

## Next step

For OTEL-native pipelines, see [OpenTelemetry integration](/guides/multi-language-opentelemetry).

## Related pages

- [.NET](./net-index.md)
- [Administration](./administration-index.md)
- [AI Coding Assistants](./ai-coding-assistants-index.md)
- [Changelog](../changelog.md)
- [Configuration](./configuration-index.md)
- [Contributing](./contributing-index.md)
- [Development](./development-index.md)
- [Evaluation](./evaluation-index.md)
- [Getting Started](./getting-started-index.md)
- [Guardrails](./guardrails-index.md)

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