Technologies are described herein for enhancing joint capability and reducing the risk of delaminating a stringer using skew-angle radius fillers. A skew-angle radius filler for enhancing joint capability includes a top surface and a bottom surface separated by a thickness. The radius filler also includes a radius contact side that has an edge radius that is sized to match a radius of a web joint of a stringer. The radius filler also includes a pair of opposing non-parallel sides that may extend from the radius contact side at an acute angle, and a rear side that is shorter than the radius contact side.