code: def describe_config_variable(self, config_id):
          
  
          config = self._config_variables.get(config_id)
          if config is None:
              return [Error.INVALID_ARRAY_KEY, 0, 0, 0, 0]
  
          packed_size = config.total_size
          packed_size |= int(config.variable) << 15
  
          return [0, 0, 0, config_id, packed_size]
docs: Describe the config variable by its id.