I am trying to make a mod where you gain perks at certain base skill levels(not modified by items/magazines). I can't figure out how to make the game check the skill levels after level up or after reading a book and decide if it should give you the perk or not. Any help is appreciated.

Thanks,
purge_

First of all, if you're the author of the mod out there, thank you I love your mod.

I think you can attach a check script to objects since sunset sarsasperilla star caps already have one like that (that changes their object type to caps if you already did Lucky Stars). Maybe you could perform a check on the player when they click it through a script like that and change the item type between a "normal" skill book and a perk-granting one if their level is around the threshold? Obviously that would have issues with people picking up but not using multiple books, but it might be a workaround.