diff --git a/backend/app/services/seed.py b/backend/app/services/seed.py
index a0bdd07..f8e8f14 100644
--- a/backend/app/services/seed.py
+++ b/backend/app/services/seed.py
@@ -82,6 +82,13 @@ async def seed_database(db: AsyncSession) -> None:
 
     db.add_all([admin, role, *permissions, *menus, provider, model, agent, workflow, team, announcement])
     await db.flush()
-    workflow.definition["nodes"][1]["data"]["agent_id"] = agent.id
+    workflow.definition = {
+        "nodes": [
+            {"id": "start", "type": "start", "data": {}},
+            {"id": "plan", "type": "agent", "data": {"agent_id": agent.id}},
+            {"id": "end", "type": "end", "data": {}},
+        ],
+        "edges": [],
+    }
     team.members = [{"agent_id": agent.id, "role": "planner"}, {"agent_id": agent.id, "role": "reviewer"}]
     await db.commit()