# listScorers()

The `listScorers()` method returns all scorers that have been registered with the Mastra instance. Scorers are used for evaluating AI outputs and can override default scorers during agent generation or workflow execution.

## Usage example

```typescript
import { mastra } from './mastra'

// Get all registered scorers
const allScorers = mastra.listScorers()

// Access a specific scorer
const myScorer = allScorers.relevancyScorer
```

## Parameters

This method takes no parameters.

## Returns

**scorers** (`Record<string, MastraScorer> | undefined`): An object containing all registered scorers, where keys are scorer names and values are MastraScorer instances. Returns undefined if no scorers are registered.

## Related

- [getScorer()](https://mastra.ai/reference/core/getScorer) - Get a specific scorer by key
- [getScorerById()](https://mastra.ai/reference/core/getScorerById) - Get a scorer by its id property
- [Scorers Overview](https://mastra.ai/docs/evals/overview) - Learn about creating and using scorers