[**axiom v0.51.1**](../../README.md)

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[axiom](../../README.md) / [config](../README.md) / AxiomEvalInstrumentationHook

# Type Alias: AxiomEvalInstrumentationHook()

> **AxiomEvalInstrumentationHook** = (`options`) => `AxiomEvalInstrumentationResult` \| `Promise`\<`AxiomEvalInstrumentationResult`\>

Hook function to initialize application OpenTelemetry instrumentation.
Called before eval execution with resolved Axiom connection details.

## Parameters

### options

`AxiomEvalInstrumentationOptions`

Configuration options

## Returns

`AxiomEvalInstrumentationResult` \| `Promise`\<`AxiomEvalInstrumentationResult`\>

TracerProvider or Promise resolving to TracerProvider

## Example

```typescript
instrumentation: ({ url, token, dataset }) => {
  return setupAppInstrumentation({ url, token, dataset });
}
```