Update app.py

app.py

@@ -11,12 +11,18 @@ from Gradio_UI import GradioUI
 @tool
 def my_custom_tool(arg1:str, arg2:int)-> str: #it's import to specify the return type
     #Keep this format for the description / args / args description but feel free to modify the tool
-    """A tool that does nothing yet 
+    """A tool that prints the first or the last letter of a word
     Args:
-        arg1: the first argument
-        arg2: the second argument
+        arg1: the word
+        arg2: the first or the last letter
     """
-    return "What magic will you build ?"
+    if arg2 == 'first':
+        return arg1[0]
+    else if arg2 == 'last':
+        return arg1[-1]
+    else:
+        return 'arg2 format is not correct'
+    
 
 @tool
 def get_current_time_in_timezone(timezone: str) -> str:
@@ -55,7 +61,7 @@ with open("prompts.yaml", 'r') as stream:
     
 agent = CodeAgent(
     model=model,
-    tools=[get_current_time_in_timezone,final_answer], ## add your tools here (don't remove final answer)
+    tools=[get_current_time_in_timezone,final_answer,image_generation_tool], ## add your tools here (don't remove final answer)
     max_steps=6,
     verbosity_level=1,
     grammar=None,