diff --git a/llama_stack/apis/agents/agents.py b/llama_stack/apis/agents/agents.py
index ccd15c3d6..367648ded 100644
--- a/llama_stack/apis/agents/agents.py
+++ b/llama_stack/apis/agents/agents.py
@@ -179,7 +179,7 @@ class AgentConfigCommon(BaseModel):
 class AgentConfig(AgentConfigCommon):
     model: str
     instructions: str
-    enable_session_persistence: bool
+    enable_session_persistence: Optional[bool] = False
     response_format: Optional[ResponseFormat] = None