and performing perturbation theory expansion in terms of λ with proper restoration of permutation symmetry of the dimer wavefunction. In numerous benchmark studies, SAPT demonstrated competitive accuracy with respect to gold-standard quantum chemistry methods. Traditionally, SAPT has been predominantly utilized for the analysis of interaction energies, establishing it as an essential tool for exploring multidimensional potential energy surfaces, conducting interaction energy decompositions, and developing force fields. However, its application has remained largely restricted to these areas, with limited use in investigating molecular properties or energy gradients. Given the multitude of challenges in chemical physics that critically rely on energy derivatives, there is a clear need for progress to expand SAPT's scope into these new directions.