> ## Documentation Index
> Fetch the complete documentation index at: https://praison.ai/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# fail • Rust AI Agent SDK

> fail: Mark as failed.

# fail

<div className="flex items-center gap-2">
  <Badge color="purple">Method</Badge>
</div>

> This is a method of the [**PlanStep**](../classes/PlanStep) class in the [**planning**](../modules/planning) module.

Mark as failed.

## Signature

```python theme={"theme":{"light":"vitesse-light","dark":"vitesse-dark"}}
def fail(&mut self, error: impl Into<String>) -> ()
```

## Parameters

<ParamField query="error" type="impl Into<String>" required={true}>
  No description available.
</ParamField>

### Returns

<ResponseField name="Returns" type="()">
  The result of the operation.
</ResponseField>