diff --git a/.github/workflows/block_CI.yaml b/.github/workflows/block_CI.yaml
new file mode 100644
index 00000000..464d1634
--- /dev/null
+++ b/.github/workflows/block_CI.yaml
@@ -0,0 +1,27 @@
+name: Block PR
+
+on:
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  changed_files:
+    runs-on: ubuntu-latest
+    name: Test changed-files
+    permissions:
+      pull-requests: read
+
+    steps:
+      - name: Get changed files
+        id: changed-files
+        uses: tj-actions/changed-files@v39
+
+      - name: List all changed files
+        run: |
+          for file in ${{ steps.changed-files.outputs.all_changed_files }}; do
+            echo "$file was changed"
+            if [[ "$file" == *"verilog/rtl/"* || "$file" == *"mag/"* || "$file" == *"gds/"* ]]; then
+              exit 1
+            fi
+          done