Update app.py fix errors

app.py

@@ -4,6 +4,7 @@ import requests
 import pytz
 import yaml
 from tools.final_answer import FinalAnswerTool
+import random
 
 from Gradio_UI import GradioUI
 
@@ -26,7 +27,6 @@ def my_custom_tool(arg1: str, arg2: int) -> str:
         "{}: Your spaceship’s toaster gains sentience tomorrow. Be nice to it.".format(arg1)
     ]
 
-    import random
     return random.choice(fortunes)
 
 @tool
@@ -66,7 +66,7 @@ with open("prompts.yaml", 'r') as stream:
     
 agent = CodeAgent(
     model=model,
-    tools=[final_answer], ## add your tools here (don't remove final answer)
+    tools=[my_custom_tool,final_answer], ## add your tools here (don't remove final answer)
     max_steps=6,
     verbosity_level=1,
     grammar=None,