Capped Vertex Functions for ${\text{Hilb}}^n({\mathbb{C}}^2)$

We obtain explicit formulas for capped descendent vertex functions of ${\text{Hilb}}^n({\mathbb{C}}^2)$ for descendents given by the exterior algebra of the tautological bundle. This formula provides a one-parametric deformation of the generating function for normalized Macdonald polynomials. In particular, we show that the capped vertex functions are rational functions of the quantum parameter.