Like all skill capes, the Agility cape gives +9 to all defensive stats, and also a +4 bonus to prayer if it is trimmed, which requires a separate skill at level 99. The cape is automatically trimmed if this condition is met.
When the agility cape is equipped, it will act as a substitute to the graceful cape, granting the same -4 kg in weight reduction; as a substitute, it will also grant the graceful outfit's set effect when worn with the other five Graceful pieces. Once per day, it is also able to restore the player's run energy to 100%, and provide the effect of a stamina potion for one minute.
As of 1 September 2018, there are 9,887 current members that have achieved level 99 in Agility.