  We show how to construct the general action coupling (multi)instantons to
gauge theories arising from branes probing arbitrary toric singularities. We
give a general set of rules for how to construct such an action given the
knowledge of the superpotential for the gauge theory. The main idea is to
obtain the action by higgsing a theory whose instanton dynamics is known,
namely an orbifold of N=4 super Yang-Mills. We find that the couplings of the
fermionic zero-modes with the holomorphic fields are dictated by the structure
of the superpotential describing the toric singularity. We present explicit
examples such as the Suspended Pinch Point, the Conifold and the first three
del Pezzo's. We perform various checks on these results by further higgsing to
smaller orbifolds and present some applications, including both gauge theory
and stringy instantons.
