Apply patch [skip ci]

libs/prebuilt/langgraph/prebuilt/chat_agent_executor.py

@@ -903,6 +903,8 @@ def create_react_agent(
         if not isinstance(last_message, AIMessage) or not last_message.tool_calls:
             if post_model_hook is not None:
                 return "post_model_hook"
+            elif response_format is not None:
+                return "respond"
             else:
                 return END
         # Otherwise if there is, we continue
@@ -1077,3 +1079,4 @@ __all__ = [
 
 
 
+