Update app.py

app.py

@@ -33,7 +33,22 @@ def get_current_time_in_timezone(timezone: str) -> str:
     except Exception as e:
         return f"Error fetching time for timezone '{timezone}': {str(e)}"
 
-
+@tool
+def calculate(expression: str) -> str:
+    """Evaluates a basic math expression and returns the result.
+    Args:
+        expression: A string containing a math expression to evaluate (e.g., '2 + 2', '(5 * 3) - 1', '10 / 4').
+    """
+    try:
+        # Only allow safe characters: digits, operators, parentheses, decimal points, spaces
+        allowed_chars = set("0123456789+-*/(). ")
+        if not all(char in allowed_chars for char in expression):
+            return f"Error: expression contains invalid characters: '{expression}'"
+        
+        result = eval(expression)
+        return f"The result of '{expression}' is {result}"
+    except Exception as e:
+        return f"Error evaluating expression '{expression}': {str(e)}"
 final_answer = FinalAnswerTool()
 
 # If the agent does not answer, the model is overloaded, please use another model or the following Hugging Face Endpoint that also contains qwen2.5 coder:
@@ -55,7 +70,7 @@ with open("prompts.yaml", 'r') as stream:
     
 agent = CodeAgent(
     model=model,
-    tools=[final_answer], ## add your tools here (don't remove final answer)
+    tools=[final_answer, generate_qr_code, calculate],  # <-- added here
     max_steps=6,
     verbosity_level=1,
     grammar=None,