Sorry if this has been addressed. I noticed that on my character sheet, the only thing that impacts AC is ability scores and armor but not spells. Wizard with base AC of 12, wielding shield (war caster), brings to 14. I cast Mage Armor should raise base to 15 with. +2 Dex, 17 wielding shield. Cast Shield spell, should in theory raise AC for one round to 22 (20 w/o shield), no effect from either spell.
Sorry if this has been addressed. I noticed that on my character sheet, the only thing that impacts AC is ability scores and armor but not spells. Wizard with base AC of 12, wielding shield (war caster), brings to 14. I cast Mage Armor should raise base to 15 with. +2 Dex, 17 wielding shield. Cast Shield spell, should in theory raise AC for one round to 22 (20 w/o shield), no effect from either spell.
There isn't any support for temporary effects on the character sheet yet. It is a planned feature.
For now you can create a homebrew magic item that sets base AC to 13 (fixed value 3 in modifier) and equip it when the spell is cast.