@utilities.arguments_not_none<EOL><INDENT>def set_effective_agent_id(self, agent_id):<DEDENT>
self._effective_agent_id = agent_id<EOL>
Sets the effective agent ``Id`` to indicate acting on behalf of.

        arg:    agent_id (osid.id.Id): an agent ``Id``
        raise:  NullArgument - ``agent_id`` is ``null``
        *compliance: mandatory -- This method must be implemented.*