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# dataset.updateExperiment()

**Added in:** `@mastra/core@1.64.0`

Updates the name, description, or metadata of an existing experiment (run). Status and result counters are managed by the experiment lifecycle and can't be changed here.

## Usage example

```typescript
import { Mastra } from '@mastra/core'

const mastra = new Mastra({/* storage config */})

const dataset = await mastra.datasets.get({ id: 'dataset-id' })

const experiment = await dataset.updateExperiment({
  experimentId: 'exp-id',
  name: 'Baseline vs. new prompt',
  description: 'Run after switching to the shorter system prompt',
})

console.log(experiment.name)
```

## Parameters

**experimentId** (`string`): ID of the experiment to update. Must belong to this dataset.

**name** (`string`): New display name for the experiment.

**description** (`string`): New description for the experiment.

**metadata** (`Record<string, unknown>`): Replacement metadata for the experiment.

Omitted fields are left unchanged.

## Returns

**result** (`Promise<Experiment>`): The updated experiment record. See dataset.listExperiments() for the full shape.

## Related

- [dataset.getExperiment()](https://mastra.ai/reference/datasets/getExperiment)
- [dataset.listExperiments()](https://mastra.ai/reference/datasets/listExperiments)