fix: using self.agent

app.py

@@ -16,7 +16,7 @@ class BasicAgent:
         self.agent = BasicOpenAIAgentWorkflow(
             tools=[]  # search_web_extract_info
             )
-        self.workflow = basic_tool_agent.create_basic_tool_use_agent_state_graph()
+        self.workflow = self.agent.create_basic_tool_use_agent_state_graph()
         print("BasicAgent initialized.")
     def __call__(self, question: str) -> str:
         print(f"Agent received question (first 50 chars): {question[:50]}...")