langchain/tools/ddg_search/tool.py/DuckDuckGoSearchTool
def DuckDuckGoSearchTool(*args: Any, **kwargs: Any) -> DuckDuckGoSearchRun:
    warnings.warn(
        "DuckDuckGoSearchTool will be deprecated in the future. "
        "Please use DuckDuckGoSearchRun instead.",
        DeprecationWarning,
    )
    return DuckDuckGoSearchRun(*args, **kwargs)