@abc.abstractmethod<EOL><INDENT>def get_agents_by_record_type(self, agent_record_type):<DEDENT>
return<EOL>
Gets an ``AgentList`` containing the given agent record ``Type``.

        In plenary mode, the returned list contains all known agents or
        an error results. Otherwise, the returned list may contain only
        those agents that are accessible through this session.

        :param agent_record_type: an agent record type
        :type agent_record_type: ``osid.type.Type``
        :return: the returned ``Agent`` list
        :rtype: ``osid.authentication.AgentList``
        :raise: ``NullArgument`` -- ``agent_record_type`` is ``null``
        :raise: ``OperationFailed`` -- unable to complete request
        :raise: ``PermissionDenied`` -- authorization failure

        *compliance: mandatory -- This method must be implemented.*