diff --git a/ai-service/app/services/retrieval/strategy/config.py b/ai-service/app/services/retrieval/strategy/config.py
index 0d04fa6..1334795 100644
--- a/ai-service/app/services/retrieval/strategy/config.py
+++ b/ai-service/app/services/retrieval/strategy/config.py
@@ -69,7 +69,7 @@ class RerankerConfig:
 @dataclass
 class ModeRouterConfig:
     """模式路由配置。【AC-AISVC-RES-09~15】"""
-    runtime_mode: RuntimeMode = RuntimeMode.DIRECT
+    runtime_mode: RuntimeMode = RuntimeMode.AUTO
     react_trigger_confidence_threshold: float = 0.6
     react_trigger_complexity_score: float = 0.5
     react_max_steps: int = 5