“The agency” has lengthy been shorthand for the royal household, ever since Prince Philip is claimed to have coined it on his marriage to Princess Elizabeth. It was utilized by Diana, Princess of Wales, and usually not in a complimentary manner.
Through the years it has acquired extra destructive connotations, maybe greater than Philip may have foreseen, conjuring a juggernaut of monarchy, resisting interference and impediment.
It has been used to explain core members of the royal household. Equally, it has been used to encapsulate the broader establishment of senior households and the boys, and girls, “in gray fits” that Meghan seems to have come to intensely dislike.