ReviewUnusedParameter.md

description	ReviewUnusedParameter
ms.date	07/21/2026
ms.topic	reference
title	ReviewUnusedParameter

ReviewUnusedParameter

Severity Level: Warning

Default state: Always enabled

Description

This rule detects parameters that are declared but not used in a script, scriptblock, or function scope. You should consider removing unused parameters to improve code clarity and reduce confusion about your function's dependencies.

Example

Noncompliant

function Test-Parameter
{
    Param (
        $Parameter1,

        # This parameter is never called in the function
        $Parameter2
    )

    Get-Something $Parameter1
}

Compliant

function Test-Parameter
{
    Param (
        $Parameter1,

        # Now this parameter is being called in the same scope
        $Parameter2
    )

    Get-Something $Parameter1 $Parameter2
}

Configure rule

By default, this rule doesn't consider child scopes other than scriptblocks provided to either Where-Object or ForEach-Object. The CommandsToTraverse setting is a string array that allows you to add extra commands that accept scriptblocks that this rule should examine.

@{
    Rules = @{
        PSReviewUnusedParameter = @{
            CommandsToTraverse = @(
                'Invoke-PSFProtectedCommand'
            )
        }
    }
}

While this rule is configurable, it's always enabled. Use one of the following methods to avoid using this rule:

• Create a custom rule configuration file to include only the rules you want or exclude the rules you don't want.
• Add the appropriate rule suppression attributes to your code to suppress the rule for specific code blocks. For more information, see the Suppressing rules section of Using PSScriptAnalyzer.