Quote Originally Posted by Seasoned Alcoholic
Also, I haven't noticed so far the other two agents (Spy and Diplomat) receiving new retinue members, such as 'Pet Monkey', 'Foreign Hostage', 'Linguist', 'Dancer', 'Courtesan'. These are the kind of ancillaries they gained in RTW after completing various missions.

Looks as though all agents are bugged from receiving new retinue members.
I haven't seen ancillaries for my spies or assassins, but one of my Diplomats managed to get a foreign hostage. Granted, this is the only time I've seen an agent get any kind of retinue during a completed Saxon, Sarmatian and ongoing WRE game... (it was the during the WRE game the foreign hostage popped up)