Update app.py

Corrected DuckDuckGoSearchTool usage as a tool

app.py

@@ -55,7 +55,7 @@ with open("prompts.yaml", 'r') as stream:
     
 agent = CodeAgent(
     model=model,
-    tools=[DuckDuckGoSearchTool,final_answer], ## add your tools here (don't remove final answer)
+    tools=[DuckDuckGoSearchTool(),final_answer], ## add your tools here (don't remove final answer)
     max_steps=6,
     verbosity_level=1,
     grammar=None,