diff --git a/apps/dot-ai-stack.yaml b/apps/dot-ai-stack.yaml
index e105754..5fba970 100644
--- a/apps/dot-ai-stack.yaml
+++ b/apps/dot-ai-stack.yaml
@@ -34,6 +34,10 @@ metadata:
   namespace: argocd
   annotations:
     argocd.argoproj.io/sync-wave: "1"
+    notifications.argoproj.io/subscribe.on-sync-running.slack: ""
+    notifications.argoproj.io/subscribe.on-sync-succeeded.slack: ""
+    notifications.argoproj.io/subscribe.on-sync-failed.slack: ""
+    notifications.argoproj.io/subscribe.on-degraded.slack: ""
   labels:
     app.kubernetes.io/name: dot-ai-stack
     app.kubernetes.io/part-of: apps
diff --git a/apps/feedback-hub.yaml b/apps/feedback-hub.yaml
index 9817fc7..a86c255 100644
--- a/apps/feedback-hub.yaml
+++ b/apps/feedback-hub.yaml
@@ -7,6 +7,12 @@ metadata:
     app.kubernetes.io/name: feedback-hub
     app.kubernetes.io/part-of: apps
     app.kubernetes.io/managed-by: argocd
+  annotations:
+    argocd.argoproj.io/sync-wave: "1"
+    notifications.argoproj.io/subscribe.on-sync-running.slack: ""
+    notifications.argoproj.io/subscribe.on-sync-succeeded.slack: ""
+    notifications.argoproj.io/subscribe.on-sync-failed.slack: ""
+    notifications.argoproj.io/subscribe.on-degraded.slack: ""
 spec:
   project: default
   source:
diff --git a/apps/musicman.yaml b/apps/musicman.yaml
index 6abb9ea..e16771f 100644
--- a/apps/musicman.yaml
+++ b/apps/musicman.yaml
@@ -3,6 +3,12 @@ kind: Application
 metadata:
   name: music-man
   namespace: argocd
+  annotations:
+    argocd.argoproj.io/sync-wave: "1"
+    notifications.argoproj.io/subscribe.on-sync-running.slack: ""
+    notifications.argoproj.io/subscribe.on-sync-succeeded.slack: ""
+    notifications.argoproj.io/subscribe.on-sync-failed.slack: ""
+    notifications.argoproj.io/subscribe.on-degraded.slack: ""
   labels:
     app.kubernetes.io/name: music-man
     app.kubernetes.io/part-of: apps
diff --git a/cluster-resources/argocd-notifications-secret-sealed.yaml b/cluster-resources/argocd-notifications-secret-sealed.yaml
new file mode 100644
index 0000000..eb573cf
--- /dev/null
+++ b/cluster-resources/argocd-notifications-secret-sealed.yaml
@@ -0,0 +1,16 @@
+---
+apiVersion: bitnami.com/v1alpha1
+kind: SealedSecret
+metadata:
+  creationTimestamp: null
+  name: argocd-notifications-secret
+  namespace: argocd
+spec:
+  encryptedData:
+    slack-webhook-url: 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
+  template:
+    metadata:
+      creationTimestamp: null
+      name: argocd-notifications-secret
+      namespace: argocd
+    type: Opaque
diff --git a/infra/values/argocd-values.yaml b/infra/values/argocd-values.yaml
index 83d2870..0f8d89c 100644
--- a/infra/values/argocd-values.yaml
+++ b/infra/values/argocd-values.yaml
@@ -20,3 +20,77 @@ server:
   extraArgs:
   - --insecure
   - --disable-auth
+
+notifications:
+  # Don't create secret via Helm - using SealedSecret instead
+  secret:
+    create: false
+
+  # Configure notification service and templates
+  cm:
+    # Define Slack service using webhook URL from sealed secret
+    service.webhook.slack: |
+      url: $slack-webhook-url
+      headers:
+      - name: Content-Type
+        value: application/json
+
+    # Template: Application syncing
+    template.app-syncing: |
+      webhook:
+        slack:
+          method: POST
+          body: |
+            {
+              "text": "🔄 *{{ .app.metadata.name }}* is syncing...\n📦 Revision: {{ .app.status.sync.revision | substr 0 7 }}"
+            }
+
+    # Template: Sync succeeded
+    template.app-sync-succeeded: |
+      webhook:
+        slack:
+          method: POST
+          body: |
+            {
+              "text": "✅ *{{ .app.metadata.name }}* sync succeeded\n📦 Revision: {{ .app.status.sync.revision | substr 0 7 }}{{ range .app.status.summary.images }}\n🏷️  Image: {{ . }}{{ end }}"
+            }
+
+    # Template: Sync failed
+    template.app-sync-failed: |
+      webhook:
+        slack:
+          method: POST
+          body: |
+            {
+              "text": "❌ *{{ .app.metadata.name }}* sync failed\n📦 Revision: {{ .app.status.sync.revision | substr 0 7 }}\n⚠️  Message: {{ .app.status.operationState.message }}"
+            }
+
+    # Template: Application degraded
+    template.app-degraded: |
+      webhook:
+        slack:
+          method: POST
+          body: |
+            {
+              "text": "⚠️ *{{ .app.metadata.name }}* is degraded\n🏥 Health: {{ .app.status.health.status }}\n💬 Message: {{ .app.status.health.message }}"
+            }
+
+    # Trigger: Sync running
+    trigger.on-sync-running: |
+      - when: app.status.operationState.phase in ['Running']
+        send: [app-syncing]
+
+    # Trigger: Sync succeeded
+    trigger.on-sync-succeeded: |
+      - when: app.status.operationState.phase in ['Succeeded']
+        send: [app-sync-succeeded]
+
+    # Trigger: Sync failed
+    trigger.on-sync-failed: |
+      - when: app.status.operationState.phase in ['Failed']
+        send: [app-sync-failed]
+
+    # Trigger: Application degraded
+    trigger.on-degraded: |
+      - when: app.status.health.status == 'Degraded'
+        send: [app-degraded]