Update app.py

app.py

@@ -106,5 +106,6 @@ class SpyAgent(BasicAgent):
 
 if __name__ == '__main__':
     name = 'spy'
-    agent_builder = AgentBuilder(name, agent=SpyAgent(name, model_name=os.getenv('MODEL_NAME')))
+    agent_builder = AgentBuilder(name, agent=SpyAgent(name, model_name=os.getenv('	
+gpt-4o-mini')))
     agent_builder.start()