Terminator2v

Hey guys, I'm going for 99 Theiving and I was just wondering if anyone could give me a straight answer on whether or not I need 50 agility to buy the achievement cape. I've asked a few people if they knew and i've had mixed responses. Any help would be appreciated as i would like to get my cape ASAP. Post here or PM me in game if you like. (Rsn is Terminator2v(Any Bumps will be well appreciated))