Update tools.py

tools.py

@@ -128,7 +128,7 @@ def search_wikipedia(query: str, page_title: str, language: str) -> str:
 def duckduckgo_search(query: str) -> str:
     """Use DuckDuckGo to search the web for up-to-date information.
         Args:
-            query: The query to search for on the web
+            query: The query to search for on the web. It may be a literal url (e.g. https://www.youtube.com/watch?v=7ybEg14CP1g)
     """
     url = "https://api.duckduckgo.com/"
     params = {