diff --git a/CLAUDE.md b/CLAUDE.md
index ffa67d0..21cd5d4 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -1114,6 +1114,40 @@ pnpm test:coverage
 - Functions: 50%
 - Branches: 65%
 
+## Scheduled Cron Jobs (Vercel)
+
+Automatische Hintergrund-Jobs via Vercel Cron (`vercel.json`):
+
+| Endpoint | Schedule | Beschreibung |
+|----------|----------|--------------|
+| `/api/cron/community-sync` | `*/15 * * * *` (alle 15 Min) | Synchronisiert Kommentare von YouTube, Facebook, Instagram |
+| `/api/cron/token-refresh` | `0 6,18 * * *` (6:00 + 18:00 UTC) | Erneuert ablaufende OAuth-Tokens automatisch |
+
+**Authentifizierung:**
+Alle Cron-Endpoints erfordern `Authorization: Bearer $CRON_SECRET` Header.
+
+**Manueller Trigger:**
+```bash
+# Community Sync manuell auslösen
+curl -X POST "https://your-domain/api/cron/community-sync" \
+  -H "Authorization: Bearer $CRON_SECRET" \
+  -H "Content-Type: application/json" \
+  -d '{"platforms": ["youtube", "facebook"]}'
+
+# Token Refresh manuell auslösen (Dry-Run)
+curl "https://your-domain/api/cron/token-refresh?dryRun=true" \
+  -H "Authorization: Bearer $CRON_SECRET"
+
+# Token Refresh Status prüfen
+curl -I "https://your-domain/api/cron/token-refresh" \
+  -H "Authorization: Bearer $CRON_SECRET"
+```
+
+**Monitoring:**
+- HEAD-Requests geben Status-Header zurück (`X-Sync-Running`, `X-Last-Run`, etc.)
+- Bei laufendem Job: HTTP 423 (Locked)
+- Fehlerhafte Tokens werden als Benachrichtigungen in `yt-notifications` gespeichert
+
 ## CI/CD Pipeline
 
 GitHub Actions Workflows in `.github/workflows/`:
diff --git a/vercel.json b/vercel.json
index d410113..058eeb5 100644
--- a/vercel.json
+++ b/vercel.json
@@ -4,6 +4,10 @@
     {
       "path": "/api/cron/community-sync",
       "schedule": "*/15 * * * *"
+    },
+    {
+      "path": "/api/cron/token-refresh",
+      "schedule": "0 6,18 * * *"
     }
   ]
 }