Well as the topic says:
Does anyone has an idea of how to read a spells base cost? This is not just restricted to CK, if there are 3rd party tools offering such a function like SKSE/Script Dragon pls tell me. For SKSE and CK i havent found a way to do this but maybe you have, so pls tell me

thanks

according to http://www.gamesas.com/topic/1382093-wipz-skyrim-script-extender-skse/page__hl__skse they don't have a function like that yet though they are taking requests/suggestions so...

Thanks, requested. I simply don't want to wait till they might add it in a few months. Well, I know a work-heavy workaround: I add each BaseCost of each spell to a globalvariable which I then place inside a formlist. This makes it accessible from almost everywhere. Still, just a "badass" workaround :/.
Anyone any further ideas?

you could constantly poll the player's magicka stat with getAV
then compare that to the getAV after an OnSpellCast() event

the main issue you'd have there would be getting around magicka damaging effects

The problem is i need to know this BaseCosts before the OnSpellCast()-Event . Additionally I try to avoid polling by using fitting events.

If it reduces your work slightly, UESP Wiki lists all player-usable spells' base costs.

I really wish there were more events than we have access to.

I don't know of any other events that would be helpful in this case. The vanilla solutions that I would try are all going to be sloppier and less precise than what SKSE will let you do (eventually)

if you need it before the OnSpellCast() event fires, you could use a scripted ability that uitlizes the IsCasting condition (returns true when the player is charging a spell)

without a GetSpellCost function it won't be much more helpful than OnSpellCast though