Update app.py

app.py

@@ -23,7 +23,16 @@ site_config = {
 
 @tool
 def get_latest_news(news_sites: List[str]) -> Dict[str,List[str]]:
-    """ Tool returns news headlines"""
+    """
+    Tool returns news headlines from multiple news sites.
+
+    Args:
+        news_sites (List[str]): A list of URLs of news sites to fetch headlines from.
+
+    Returns:
+        Dict[str, List[str]]: A dictionary where the keys are the news site URLs and the values are lists of headlines.
+    """
+    
     headlines = {}
     for site in news_sites:
         try: