langchain/tools/youtube/search.py/YouTubeSearchTool/_run
class YouTubeSearchTool:    def _run(
        self,
        query: str,
        run_manager: Optional[CallbackManagerForToolRun] = None,
    ) -> str:
        """Use the tool."""
        values = query.split(",")
        person = values[0]
        if len(values) > 1:
            num_results = int(values[1])
        else:
            num_results = 2
        return self._search(person, num_results)