code: def read_args_tool(toolkey, example_parameters, tool_add_args=None):
      
      import scanpy as sc
      p = default_tool_argparser(help(toolkey), example_parameters)
      if tool_add_args is None:
          p = add_args(p)
      else:
          p = tool_add_args(p)
      args = vars(p.parse_args())
      args = settings.process_args(args)
      return args
docs: Read args for single tool.