diff --git a/.github/workflows/mutation.yml b/.github/workflows/mutation.yml
new file mode 100644
index 00000000..c9d9f8ef
--- /dev/null
+++ b/.github/workflows/mutation.yml
@@ -0,0 +1,31 @@
+name: Mutation Testing Quality Gate
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - '*'
+
+jobs:
+  mutation-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+      - name: Install dependencies
+        run: npm ci
+      - name: Run mutation tests
+        run: npm run test:mutation
+      - name: Enforce mutation score threshold
+        run: |
+          MUTATION_SCORE=$(cat reports/mutation/mutation.json | jq '.mutationScore' -r)
+          echo "Mutation Score: $MUTATION_SCORE"
+          if (( $(echo "$MUTATION_SCORE < 80" | bc -l) )); then
+            echo "Mutation score below threshold (80). Failing CI."
+            exit 1
+          fi