code: def add_tag():
      
      if len(sys.argv) > 1:
          tag = sys.argv[1]
          doc_mapper = DocMapper()
          if doc_mapper.is_pipe:
              count = 0
              for obj in doc_mapper.get_pipe():
                  obj.add_tag(tag)
                  obj.update(tags=obj.tags)
                  count += 1
              print_success("Added tag '{}' to {} object(s)".format(tag, count))
          else:
              print_error("Please use this script with pipes")
      else:
          print_error("Usage: jk-add-tag <tag>")
          sys.exit()
docs: Obtains the data from the pipe and appends the given tag.