title	BCP166
description	Duplicate <decorator-name> decorator.
ms.topic	reference
ms.custom	devx-track-bicep
ms.date	10/30/2025

Bicep diagnostic code - BCP166

This diagnostic occurs when you have duplicate decorators.

Description

Duplicate <decorator-name> decorator.

Error

Remove the duplicate decorator.

The following example raises the diagnostic because there's two duplicate decorators.

@description('foo')
@description('bar')
param name string

You can fix the diagnostic by removing one of the duplicate decorators.

@description('bar')
param name string

For more information, see Decorators.

For more information about Bicep diagnostics, see Bicep core diagnostics.