diff --git a/tests/auth-page-shell-contract.ps1 b/tests/auth-page-shell-contract.ps1
new file mode 100644
index 0000000..78768f4
--- /dev/null
+++ b/tests/auth-page-shell-contract.ps1
@@ -0,0 +1,40 @@
+$ErrorActionPreference = 'Stop'
+
+function Assert-Contains {
+  param([string]$Content, [string]$Expected, [string]$Message)
+  if ($Content -notmatch [regex]::Escape($Expected)) { throw $Message }
+}
+
+function Assert-NotContains {
+  param([string]$Content, [string]$Unexpected, [string]$Message)
+  if ($Content -match [regex]::Escape($Unexpected)) { throw $Message }
+}
+
+$root = Split-Path -Parent $PSScriptRoot
+$shellPath = Join-Path $root 'components/AuthPageShell.vue'
+if (-not (Test-Path -LiteralPath $shellPath)) { throw 'AuthPageShell is missing' }
+
+$shell = Get-Content -LiteralPath $shellPath -Raw -Encoding utf8
+foreach ($required in @(
+  'class="auth-shell__header"',
+  'class="auth-shell__header-image"',
+  'a01-vnext-header-v1.png',
+  'mode="widthFix"',
+  'class="auth-shell__paper"',
+  'auth-page-paper.jpg',
+  '<slot />',
+  '<slot name="overlay" />',
+  'min-height: var(--app-viewport-height);'
+)) {
+  Assert-Contains -Content $shell -Expected $required -Message "AuthPageShell is missing: $required"
+}
+
+foreach ($pageName in @('a01-entry.vue', 'a04-register.vue', 'a05-reset-password.vue', 'a06-auth-status.vue')) {
+  $page = Get-Content -LiteralPath (Join-Path $root "pages/auth/$pageName") -Raw -Encoding utf8
+  Assert-Contains -Content $page -Expected '<AuthPageShell' -Message "$pageName must consume AuthPageShell"
+  foreach ($forbidden in @('class="page-canvas"', 'class="page-backdrop"', 'mode="scaleToFill"', '1665rpx')) {
+    Assert-NotContains -Content $page -Unexpected $forbidden -Message "$pageName retains rejected page coordinates: $forbidden"
+  }
+}
+
+Write-Output 'AUTH-PAGE-SHELL-CONTRACT PASS'