[Gryphin]

While I keep in mind that this is Sci Fi and does not represent todays world.
There are "drones" used today that are so small and built like powered gliders that most lower tech "sensors" can not pick them up. These drones can be programed to:
Move To XY
Use Pasive "Sensors"
Record the data internaly
Return to Base
Where the data is extracted
The observed parties never know it was there.

In referance to the AI minding the presence of drones in its system:
I would love to have short range hard to detect "reon drones" that could be reused X number of times.
I could see these drones being so small thay could move through mine fields and past satelites with out being detected.
The one limit would be:
You can't get the data till they return to your system or a "Mother Ship"
Again, this is based on drones being given a "Move To" about which I feel indifferent.