diff --git a/Tests/FeatureParameterContracts.Tests.ps1 b/Tests/FeatureParameterContracts.Tests.ps1
new file mode 100644
index 0000000..90f2a38
--- /dev/null
+++ b/Tests/FeatureParameterContracts.Tests.ps1
@@ -0,0 +1,92 @@
+BeforeAll {
+    $script:RepoRoot = Join-Path $PSScriptRoot '..'
+    $script:FeaturesPath = Join-Path $script:RepoRoot 'Config\Features.json'
+    $script:Win11DebloatPath = Join-Path $script:RepoRoot 'Win11Debloat.ps1'
+    $script:GetScriptPath = Join-Path $script:RepoRoot 'Scripts\Get.ps1'
+    $script:RegfilesPath = Join-Path $script:RepoRoot 'Regfiles'
+    $script:Features = @((Get-Content -LiteralPath $script:FeaturesPath -Raw | ConvertFrom-Json).Features)
+    $script:LauncherOnlyParameters = @('Dev', 'Verbose', 'WhatIf')
+
+    function Get-ScriptParameterNames {
+        param(
+            [Parameter(Mandatory)]
+            [string]$Path
+        )
+
+        $tokens = $null
+        $parseErrors = $null
+        $ast = [System.Management.Automation.Language.Parser]::ParseFile($Path, [ref]$tokens, [ref]$parseErrors)
+        $parseErrors | Should -BeNullOrEmpty
+
+        @($ast.ParamBlock.Parameters | ForEach-Object { $_.Name.VariablePath.UserPath })
+    }
+}
+
+Describe 'FeatureId parameter contracts' {
+    It 'declares every FeatureId as a parameter on Win11Debloat.ps1' {
+        $parameterNames = Get-ScriptParameterNames -Path $script:Win11DebloatPath
+        $missing = @($script:Features.FeatureId | Where-Object { $parameterNames -notcontains $_ })
+
+        $missing | Should -HaveCount 0 -Because ($missing -join ', ')
+    }
+
+    It 'declares every FeatureId as a parameter on Scripts/Get.ps1' {
+        $parameterNames = Get-ScriptParameterNames -Path $script:GetScriptPath
+        $missing = @($script:Features.FeatureId | Where-Object { $parameterNames -notcontains $_ })
+
+        $missing | Should -HaveCount 0 -Because ($missing -join ', ')
+    }
+
+    It 'keeps Scripts/Get.ps1 aligned with Win11Debloat.ps1 plus launcher-only switches' {
+        $win11DebloatParameters = Get-ScriptParameterNames -Path $script:Win11DebloatPath
+        $getParameters = Get-ScriptParameterNames -Path $script:GetScriptPath
+        $missingFromGet = @($win11DebloatParameters | Where-Object { $getParameters -notcontains $_ })
+        $missingLauncherOnly = @(
+            $script:LauncherOnlyParameters |
+                Where-Object { $getParameters -notcontains $_ }
+        )
+        $unexpectedOnGet = @(
+            $getParameters |
+                Where-Object { $win11DebloatParameters -notcontains $_ -and $script:LauncherOnlyParameters -notcontains $_ }
+        )
+
+        $missingFromGet | Should -HaveCount 0 -Because ($missingFromGet -join ', ')
+        $missingLauncherOnly | Should -HaveCount 0 -Because ($missingLauncherOnly -join ', ')
+        $unexpectedOnGet | Should -HaveCount 0 -Because ($unexpectedOnGet -join ', ')
+    }
+
+    It 'keeps every RegistryKey file in Regfiles and Regfiles/Sysprep' {
+        $missing = @(
+            foreach ($feature in $script:Features) {
+                if ([string]::IsNullOrWhiteSpace($feature.RegistryKey)) { continue }
+
+                $applyPath = Join-Path $script:RegfilesPath $feature.RegistryKey
+                $sysprepPath = Join-Path (Join-Path $script:RegfilesPath 'Sysprep') $feature.RegistryKey
+                if (-not (Test-Path -LiteralPath $applyPath -PathType Leaf)) {
+                    "$($feature.FeatureId) missing Regfiles\$($feature.RegistryKey)"
+                }
+                if (-not (Test-Path -LiteralPath $sysprepPath -PathType Leaf)) {
+                    "$($feature.FeatureId) missing Regfiles\Sysprep\$($feature.RegistryKey)"
+                }
+            }
+        )
+
+        $missing | Should -HaveCount 0 -Because ($missing -join '; ')
+    }
+
+    It 'keeps every RegistryUndoKey file in Regfiles/Undo or Regfiles' {
+        $missing = @(
+            foreach ($feature in $script:Features) {
+                if ([string]::IsNullOrWhiteSpace($feature.RegistryUndoKey)) { continue }
+
+                $undoPath = Join-Path (Join-Path $script:RegfilesPath 'Undo') $feature.RegistryUndoKey
+                $rootPath = Join-Path $script:RegfilesPath $feature.RegistryUndoKey
+                if (-not ((Test-Path -LiteralPath $undoPath -PathType Leaf) -or (Test-Path -LiteralPath $rootPath -PathType Leaf))) {
+                    "$($feature.FeatureId) missing undo file $($feature.RegistryUndoKey)"
+                }
+            }
+        )
+
+        $missing | Should -HaveCount 0 -Because ($missing -join '; ')
+    }
+}