Update app.py

app.py

@@ -33,6 +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 calculator(expression: str) -> str:
+    """A tool that evaluates a basic math expression and returns the result.
+    Args:
+        expression: A string containing a math expression (e.g., '2 + 2 * 3').
+    """
+    try:
+        # Only allow safe characters to avoid arbitrary code execution
+        allowed_chars = "0123456789+-*/(). "
+        if not all(c in allowed_chars for c in expression):
+            return "Error: expression contains invalid characters."
+        result = eval(expression, {"__builtins__": {}}, {})
+        return f"The result of '{expression}' is {result}"
+    except Exception as e:
+        return f"Error evaluating expression '{expression}': {str(e)}"
+
 
 final_answer = FinalAnswerTool()
 
@@ -55,7 +71,7 @@ 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, calculator], ## add your tools here (don't remove final answer)
     max_steps=6,
     verbosity_level=1,
     grammar=None,