docs: def _help_workers(self):
          """ Help on all the available workers """
          help =  'Workbench Workers:'
          for worker in self.list_all_workers():
              full_help = self.work_request('help_formatter', worker)['help_formatter']['help']
              compact_help = full_help.split('\n')[:4]
              help += '\n\n%s' % '\n'.join(compact_help)
          return help