So I made an erudite chanter
 

And forgot to put 5 points in agility.

Will this make or break the character?

Since you are not a melee type, this isn't really game breaking.

Cool Yeah I was hoping that was the case, with a few pieces of loam encrusted gear he is sitting at like 84 agil now.

I put all 20 points into sta for my erudite paladin; was this a mistake?

yes

there's lots of AGI items...i hope you put that into STA.

People play erudites!? I haven't seen one in months.