diff --git a/next.config.ts b/next.config.ts
index 73ad8fc61..3ffe1615a 100644
--- a/next.config.ts
+++ b/next.config.ts
@@ -22,6 +22,7 @@ const nextConfig: NextConfig = {
     '@mirrorbuddy/i18n',
     '@mirrorbuddy/utils',
     '@mirrorbuddy/tier',
+    '@mirrorbuddy/safety',
   ],
   // Enable standalone output for Docker deployment
   // Creates .next/standalone with minimal server.js for production
diff --git a/package.json b/package.json
index e829ffb87..35fb2e6a9 100644
--- a/package.json
+++ b/package.json
@@ -119,6 +119,7 @@
     "@mirrorbuddy/greeting": "workspace:*",
     "@mirrorbuddy/i18n": "workspace:*",
     "@mirrorbuddy/logger": "workspace:*",
+    "@mirrorbuddy/safety": "workspace:*",
     "@mirrorbuddy/tier": "workspace:*",
     "@mirrorbuddy/types": "workspace:*",
     "@mirrorbuddy/utils": "workspace:*",
diff --git a/packages/safety/package.json b/packages/safety/package.json
new file mode 100644
index 000000000..9638842df
--- /dev/null
+++ b/packages/safety/package.json
@@ -0,0 +1,34 @@
+{
+  "name": "@mirrorbuddy/safety",
+  "version": "0.1.0",
+  "private": true,
+  "description": "Child-safety guardrails for MirrorBuddy (reversed-shim — canonical impl in src/lib/safety)",
+  "license": "Apache-2.0",
+  "main": "./src/index.ts",
+  "types": "./src/index.ts",
+  "exports": {
+    ".": {
+      "types": "./src/index.ts",
+      "default": "./src/index.ts"
+    },
+    "./server": {
+      "types": "./src/server.ts",
+      "default": "./src/server.ts"
+    }
+  },
+  "files": [
+    "src"
+  ],
+  "scripts": {
+    "typecheck": "tsc --noEmit"
+  },
+  "dependencies": {
+    "@mirrorbuddy/db": "workspace:*",
+    "@mirrorbuddy/greeting": "workspace:*",
+    "@mirrorbuddy/logger": "workspace:*",
+    "@mirrorbuddy/types": "workspace:*"
+  },
+  "devDependencies": {
+    "typescript": "^5"
+  }
+}
diff --git a/packages/safety/src/index.ts b/packages/safety/src/index.ts
new file mode 100644
index 000000000..5f02fb7a5
--- /dev/null
+++ b/packages/safety/src/index.ts
@@ -0,0 +1,4 @@
+// @mirrorbuddy/safety — reversed-shim entry.
+// Canonical implementation lives at src/lib/safety during W3 migration
+// (see CONTRIBUTING-MONOREPO.md §Test-arch).
+export * from '../../../src/lib/safety';
diff --git a/packages/safety/src/server.ts b/packages/safety/src/server.ts
new file mode 100644
index 000000000..53ae2e09a
--- /dev/null
+++ b/packages/safety/src/server.ts
@@ -0,0 +1,3 @@
+// @mirrorbuddy/safety/server — server-only reversed-shim entry.
+// See ./index.ts for rationale.
+export * from '../../../src/lib/safety/server';
diff --git a/packages/safety/tsconfig.json b/packages/safety/tsconfig.json
new file mode 100644
index 000000000..90eac1000
--- /dev/null
+++ b/packages/safety/tsconfig.json
@@ -0,0 +1,10 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "noEmit": true,
+    "declaration": false,
+    "composite": false
+  },
+  "include": ["src/**/*", "../../src/lib/safety/**/*"],
+  "exclude": ["dist", "node_modules"]
+}
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index b40306a28..faa77d072 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -44,6 +44,9 @@ importers:
       '@mirrorbuddy/logger':
         specifier: workspace:*
         version: link:packages/logger
+      '@mirrorbuddy/safety':
+        specifier: workspace:*
+        version: link:packages/safety
       '@mirrorbuddy/tier':
         specifier: workspace:*
         version: link:packages/tier
@@ -445,6 +448,25 @@ importers:
         specifier: ^5
         version: 5.9.3
 
+  packages/safety:
+    dependencies:
+      '@mirrorbuddy/db':
+        specifier: workspace:*
+        version: link:../db
+      '@mirrorbuddy/greeting':
+        specifier: workspace:*
+        version: link:../greeting
+      '@mirrorbuddy/logger':
+        specifier: workspace:*
+        version: link:../logger
+      '@mirrorbuddy/types':
+        specifier: workspace:*
+        version: link:../types
+    devDependencies:
+      typescript:
+        specifier: ^5
+        version: 5.9.3
+
   packages/tier:
     dependencies:
       '@mirrorbuddy/types':