Update app.py

app.py

@@ -11,7 +11,15 @@ from duckduckgo_search import DDGS
 # --- Tools ---
 @tool
 def web_search(query: str) -> str:
-    """Performs a web search using DuckDuckGo."""
+    """
+    Perform a web search using DuckDuckGo.
+
+    Args:
+        query (str): The search query string.
+
+    Returns:
+        str: A formatted string with search results.
+    """
     try:
         with DDGS() as ddgs:
             results = ddgs.text(query, max_results=3)
@@ -20,18 +28,27 @@ def web_search(query: str) -> str:
                 for r in results
             ) if results else "No results found."
     except Exception as e:
-        return f"Search error: {e}"
+        return f"Search error: {str(e)}"
+
 
 @tool
 def calculate(expression: str) -> str:
-    """Evaluates mathematical expressions."""
+    """
+    Evaluate a mathematical expression safely.
+
+    Args:
+        expression (str): The math expression to evaluate.
+
+    Returns:
+        str: The result as a string, or an error message.
+    """
     try:
         safe_dict = {k: v for k, v in math.__dict__.items() if not k.startswith("__")}
         safe_dict.update({'abs': abs, 'round': round})
         result = eval(expression, {"__builtins__": None}, safe_dict)
         return str(result)
     except Exception as e:
-        return f"Calculation error: {e}"
+        return f"Calculation error: {str(e)}"
 
 # --- Agent ---
 class GAIAAgent: