It has you avoid an attack but with a catch, it allows you another attack as a counter strike even as you don't take damage. It also deals with max damage for hits, which is a good thing to have, but not as important for monks as it is for other melee classes. Stamina - Deals with the amount of hit points gained each level, it is roughly 1 hit point a level for every 5 points you have in stamina. Nice to have as well, but not important especially as you are avoiding hits instead of merely having more hit points to be able to take it. Agility - Now here is where you drop a lot of effort on.
Agility is what the monk does best, avoid damage.
It directly relates to ac and the chance to dodge, block, riposte, dual wield and double attack successfully. This stat helps you hit more often, hit better ac, and the amount of attacks you get in as well. You miss less often with Dexterity, and with Agility they miss more. Wisdom - Eck. Intelligence - Eck.