async def acall(self, input: Any) -> ToolOutput:
        """
        This is the async version of the call method.
        Should also be implemented by the tool developer as an
        async-compatible implementation.
        """

        This is the async version of the call method.
        Should also be implemented by the tool developer as an
        async-compatible implementation.
        
llama-index-core/llama_index/core/tools/types.py