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