diff --git a/.github/workflows/adj-tester.yaml b/.github/workflows/adj-tester.yaml
index c6fd55d..891756a 100644
--- a/.github/workflows/adj-tester.yaml
+++ b/.github/workflows/adj-tester.yaml
@@ -24,4 +24,20 @@ jobs:
 
       - name: Run ADJ validation
         run: |
-          python3 .github/workflows/scripts/adj-tester/main.py
+          python3 .github/workflows/scripts/adj-tester/main.py > /dev/null 2>&1
+
+      - name: Notify Slack on failure
+        if: failure()
+        env:
+          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK_URL }}
+        run: |
+          jq -n \
+            --arg repo "${{ github.repository }}" \
+            --arg branch "${{ github.ref_name }}" \
+            --arg actor "${{ github.actor }}" \
+            --arg run_url "https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}" \
+            '{
+              text: "<!channel> ❌ ADJ Validator Failed\n\nRepository: \($repo)\nBranch: \($branch)\nActor: \($actor)\n\nWorkflow run:\n\($run_url)"
+            }' | curl -X POST -H "Content-type: application/json" \
+                 --data @- \
+                 $SLACK_WEBHOOK
diff --git a/.github/workflows/scripts/adj-tester/main.py b/.github/workflows/scripts/adj-tester/main.py
index b59ab1d..dc25c9b 100755
--- a/.github/workflows/scripts/adj-tester/main.py
+++ b/.github/workflows/scripts/adj-tester/main.py
@@ -448,6 +448,26 @@ def check_packet_json(
                 )
                 is_valid = False
 
+            # Ensure that if one of period_type, period, socket is present, all must be present
+            has_period_type = "period_type" in pkt
+            has_period = "period" in pkt
+            has_socket = "socket" in pkt
+            
+            # Count how many of the three fields are present
+            fields_present = sum([has_period_type, has_period, has_socket])
+            
+            # If any field is present, all three must be present
+            if fields_present > 0 and fields_present < 3:
+                error_list.append(
+                    logError(
+                        path,
+                        f"id {pkt_id}",
+                        f"Fields 'period_type', 'period', and 'socket' must all be present together or all be absent. "
+                        f"Found: period_type={has_period_type}, period={has_period}, socket={has_socket}",
+                    )
+                )
+                is_valid = False
+
     except RuntimeError as e:
         error_list.append(logError(path, "<load>", str(e)))
         is_valid = False