@mastra/core/dist/docs/references/reference-workflows-workflow-methods-dountil.md

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# Workflow\.dountil()

The `.dountil()` method executes a step until a condition is met. It always runs the step at least once before evaluating the condition. The first time the condition is evaluated, `iterationCount` is `1`.

## Usage example

```typescript
workflow.dountil(step1, async ({ inputData }) => true)
```

## Parameters

**step** (`Step`): The step instance to execute in the loop

**condition** (`(params : ExecuteParams & { iterationCount: number }) => Promise<boolean>`): A function that returns a boolean indicating whether to continue the loop. The function receives the execution parameters and the iteration count.

## Returns

**workflow** (`Workflow`): The workflow instance for method chaining

## Related

- [Control Flow](https://mastra.ai/docs/workflows/control-flow)

- [ExecuteParams](https://mastra.ai/reference/workflows/step)