Current system is a rather hackish solution combining luck (lot of), headScore and rushScore, that is, they will resupply ammo because the medistat is traditionally near armory and they need heal, or because they buy new equipment.
This only concerns humans, of course.
They can know how much ammo they have, but that's all (and probably move to closest armory if weapon is empty?).

Proper resupply API should include:

• a resupply score function, working the same way as the healing score
• handling for poison
• possibly handling for medkit
• handling for reloading
• handling for barbs regeneration (might be trickier since it might make adv goons too cowardly)

The bot's skill should be considered while implement all that.