Agility is a Main Attribute.
Agility influences your finesse in battle. In addition to that, it increases the Damage, Accuracy, and Crit Chance for thrown items.
Each point of Agility grants +1.5% Counter Chance and -1.5% Fumble Chance.
Reaching a threshold of 15, 20, 25, and 30 points also grants:
+5% Dodge Chance
+2.5% Hands Efficiency
+7.5% Move Resistance
Agility is capped at 30 points.