Implement count "r"s tool

app.py

@@ -7,16 +7,14 @@ from tools.final_answer import FinalAnswerTool
 
 from Gradio_UI import GradioUI
 
-# Below is an example of a tool that does nothing. Amaze us with your creativity !
 @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 
+def count_letter_r_in_word(word: str) -> int:
+    """A tool that counts the number of times the letter 'r' appears in a word
     Args:
-        arg1: the first argument
-        arg2: the second argument
+        word: A string representing a word
     """
-    return "What magic will you build ?"
+    just_rs = [char for char in word if char.lower() == 'r']
+    return len(just_rs)
 
 @tool
 def get_current_time_in_timezone(timezone: str) -> str:
@@ -66,4 +64,4 @@ agent = CodeAgent(
 )
 
 
-GradioUI(agent).launch()
+GradioUI(agent).launch()