Abstract: A toolshelf for an extension ladder comprising an essentially rectangular, planar toolshelf sized to fit horizontally between the legs of the ladder. The toolshelf is secured to a rung of the extension ladder by means of a pair of “U” bolts extending through the top surface of the toolshelf, stridling the rung, and secured by a bracket and threaded fasteners attached to the “U” bolt legs underneath the rung. The toolshelf is constructed with a curvilinear, orthogonal, or “V”-shaped cutout excised from its front edge for the purpose of stabilizing the combined toolshelf and extension ladder when the connected toolshelf is braced against the exterior corner of a structure, a pole, or a tree, in the act of performing work while standing upon the extension ladder.