diff --git a/src/daemon/spawner.py b/src/daemon/spawner.py
index d0f6139..f0ab715 100644
--- a/src/daemon/spawner.py
+++ b/src/daemon/spawner.py
@@ -197,6 +197,8 @@ class AgentSpawner:
         self.max_monitor_timeouts = max_monitor_timeouts
         # v2.7.2: counter 引用(spawn_full_agent 内部 acquire/release)
         self.counter = counter
+        # guardrails: 由 main.py 在初始化后赋值
+        self.guardrails = None
 
         # session 注册表 {session_id: {...}}
         self._sessions: Dict[str, Dict[str, Any]] = {}