@JeremyECrawford When a spell calls for a spellcasting ability check, do you add your proficiency bonus?

— Jonathan Longstaff (@pukunui81) November 6, 2016

Add your prof. bonus to a check if (a) you have prof. with a skill/tool you're using or (b) a feature like Jack of All Trades applies #DnD https://t.co/jU7MlqQu63

— Jeremy Crawford (@JeremyECrawford) November 7, 2016