def get_grading_agent(self):
return Agent(self.get_grading_agent_id())<EOL>
Gets the ``Agent`` that created this entry.

        return: (osid.authentication.Agent) - the ``Agent``
        raise:  IllegalState - ``is_graded() is false or is_derived() is
                true``
        raise:  OperationFailed - unable to complete request
        *compliance: mandatory -- This method must be implemented.*