diff --git a/api/core/agent/entities.py b/api/core/agent/entities.py
index 189c925d82..776e40e9fe 100644
--- a/api/core/agent/entities.py
+++ b/api/core/agent/entities.py
@@ -76,5 +76,5 @@ class AgentEntity(BaseModel):
     model: str
     strategy: Strategy
     prompt: Optional[AgentPromptEntity] = None
-    tools: list[AgentToolEntity] = None
+    tools: Optional[list[AgentToolEntity]] = None
     max_iteration: int = 5