problem, standard skeletons are mindless, meaning no skills (ruling out them cleaning or doing anything complex) and featless...
Ive always disagreed with the concept of evil skeletons, myself... i think summoned versions should be heavily rune carved and not evil, being magically created instead of effectively being an animated body of a living person. that way you can make a distinguishing feature that allows them to be more widely used, with "less" fear and aggression from the "holy" types.
i encountered this with first making a ship that was paddled by undead skeletons... they cant make profession checks. the DM allowed them to take cross class skills and add str to the check. since all they were doing was sit and paddle at the command of the 3 skeletons on watch.