Schematic representation of the JADE code’s key components and processes. The system shows a central star (red) with two orbiting bodies: an inner planet (blue) with a gaseous envelope and a solid core, and a distant perturber (gray). The sketch illustrates the evolution of the system across two time steps, demonstrating secular changes in the inner planet’s orbital parameters and spin-axis orientation, while the outer orbit remains fixed. The zoomed insets depict the inner planet’s atmospheric structure, showing core heating (orange) on one hand, and atmospheric escape (purple) processes under stellar irradiation (yellow) on the other hand. The three-dimensional (3D) spin-orbit angle, ψ, is highlighted in light blue. See Attia et al. (2021) for more details.