def get_authenticated_agent_id(self):
return self._provider_session.get_authenticated_agent_id()<EOL>
Gets the ``Id`` of the agent authenticated to this session.

        This is the agent for which credentials are used either acquired
        natively or via an ``OsidProxyManager``.

        return: (osid.id.Id) - the authenticated agent ``Id``
        raise:  IllegalState - ``is_authenticated()`` is ``false``
        *compliance: mandatory -- This method must be implemented.*