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text/mdx
title: AI_DecisionRefusalError
description: Identify decision questions that a model declined to answer.
# AI_DecisionRefusalError
This experimental error identifies questions that a decision model declined to
answer, such as a question the provider's safety policy refuses. It is exported
from `ai` and `@ai-sdk/provider` as `Experimental_DecisionRefusalError`.
Decision models report a refusal as an answer with `type: 'refusal'`.
`experimental_decide` throws this error when any answer is a refusal, after the
provider call and without retrying it.
## Properties
- `questionIds`: The IDs of the refused questions.
- `provider`: The provider of the decision model.
- `modelId`: The decision model ID.
- `message`: A description of the refused questions and model.
## Checking for this Error
Use the marker-based `isInstance` check, which works across package copies:
```typescript
import { Experimental_DecisionRefusalError as DecisionRefusalError } from 'ai';
if (DecisionRefusalError.isInstance(error)) {
console.log(error.questionIds, error.modelId);
}
```