created my custom function

app.py

@@ -1,22 +1,43 @@
 from smolagents import CodeAgent,DuckDuckGoSearchTool, HfApiModel,load_tool,tool
 import datetime
 import requests
+import json
 import pytz
 import yaml
 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 get_crypto_price_and_change(symbol: str) -> str:
+    """A tool that fetches the current price and 24h variation of a cryptocurrency.
     Args:
-        arg1: the first argument
-        arg2: the second argument
+        symbol: The cryptocurrency symbol (e.g., bitcoin, ethereum, cardano).
     """
-    return "What magic will you build ?"
+    try:
+        url = f"https://api.coingecko.com/api/v3/simple/price?ids={symbol.lower()}&vs_currencies=usd&include_24hr_change=true"
+        response = requests.get(url)
+        response.raise_for_status()
+        data = response.json()
+        crypto_data = data.get(symbol.lower())
+
+        if crypto_data:
+            price = crypto_data.get("usd")
+            change_24h = crypto_data.get("usd_24h_change")
+
+            if price is not None and change_24h is not None:
+                return f"{symbol.upper()} price: ${price:.2f}, 24h change: {change_24h:.2f}%"
+            else:
+                return f"Could not retrieve price or 24h change for {symbol.upper()}."
+        else:
+            return f"Cryptocurrency symbol '{symbol.upper()}' not found."
+
+    except requests.exceptions.RequestException as e:
+        return f"Error fetching data: {e}"
+    except json.JSONDecodeError:
+        return "Error decoding JSON response."
+    except Exception as e:
+        return f"An unexpected error occurred: {e}"
 
 @tool
 def get_current_time_in_timezone(timezone: str) -> str: