Spy bots appear from behind you when they spawn (also, the Administrator will alert you when they start spawning, as well as how many are left as you destroy them). Spies will draw their Revolvers when directly confronted, and will also sap buildings if they get close.
Snipers appear from the normal spawn points, moving to high ground or otherwise hard-to-reach areas. Their locations are revealed by a blue laser that points from their rifle to where they're aiming (much like Combine Snipers in Half-Life 2). When you get close, they draw their kukris.
Both are rather easy to deal with when you're aware of their presence, but they will, like humans, take advantage of distractions like Giant Bots and Tanks.
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