Shell is a generation tool that creates mathematically accurate 3D seashells using Raup growth parameters and aperture shaping. It provides fully parametric control over the generation process, including parameters for ribbing, twisting, flaring, exponential growth, and segment density. Users can create a range of results from naturalistic to stylized forms. The tool includes a live update function, content-aware editing, and adds a dedicated tab to the 3D viewport.