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title: AI_InvalidToolApprovalSignatureError
description: Learn how to fix AI_InvalidToolApprovalSignatureError
# AI_InvalidToolApprovalSignatureError
This error occurs when `experimental_toolApprovalSecret` is configured and a tool approval replayed from the message history has a missing or invalid HMAC signature. The server rejects the approval before the tool executes.
Common causes:
- The approval was fabricated by the client (no signature present)
- The tool arguments were modified after the approval was signed
- The server secret changed between issuance and verification (e.g. after key rotation without overlap)
## Properties
- `approvalId`: The approval ID that failed verification
- `toolCallId`: The tool call ID the approval was for
## Checking for this Error
You can check if an error is an instance of `AI_InvalidToolApprovalSignatureError` using:
```typescript
import { InvalidToolApprovalSignatureError } from 'ai';
if (InvalidToolApprovalSignatureError.isInstance(error)) {
// Handle the error
}
```