diff --git a/llama_stack/apis/agents/agents.py b/llama_stack/apis/agents/agents.py
index 5fd90ae7a..b0fcbf56e 100644
--- a/llama_stack/apis/agents/agents.py
+++ b/llama_stack/apis/agents/agents.py
@@ -297,6 +297,7 @@ class AgentConfig(AgentConfigCommon):
     model: str
     instructions: str
     enable_session_persistence: bool
+    response_format: Optional[ResponseFormat] = None
 
 
 class AgentConfigOverridablePerTurn(AgentConfigCommon):