fix tool

community_tools.py

@@ -15,11 +15,11 @@ arxiv_tools = [Tool.from_langchain(tool) for tool in load_tools(["arxiv"])]
 community_tools = [google_map_tool, wikipedia_tool, *arxiv_tools]
 
 @tool
-def get_youtube_transcript_from_url(video_url: str = None)->str:
+def get_youtube_transcript_from_url(video_url: str)->str:
     """
     Get the transcript of a YouTube video
     Args:
-        video_url: The URL of the YouTube video
+        video_url: The URL of the YouTube video (e.g. https://www.youtube.com/watch?v=dQw4w9WgXcQ)
     Returns:
         The transcript of the YouTube video as a string
     """