[Finalgenesis]

Putting aside whether Using assassins or spies as scouts are a breach of NAP, since they have no auto-aggressive abilities (assassination or incite unrest require specific order to activate, unlike sceptic, reapers and auto-unrest some units have). Do note that:

All of EA Abysia's scouts have the assassin ability. For reference they are slayer and demonbred.

So in a way, I wouldn't say they are breaching NAP unless they are assassinating commanders and thus commit an actual act of aggression with intent. Not to mention they have no scout commander without assassin ability.

Note: I've never ran into assassins being used as scouts in previous MP games so I'm unsure what the accepted consensus is. I'm only going by the general principle vets have impressed on me: actual act of aggression with intent (e.g. random global overwrite seem like aggression, but lacks specific intent and thus not a breach of NAP). We may have to trot out a vet again if you want to be sure.