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The primary function of a Shell tool in design software is to remove material and create a hollow cavity within a solid object. This tool is widely used in modeling to transform a solid part into a thin-walled structure, allowing for the design of components that require a specific thickness while reducing the overall mass and material usage. By specifying the wall thickness, the Shell tool ensures that the remaining structure maintains its integrity while being hollow, which is ideal for applications such as plastic parts, containers, and other hollow forms.

Other options may involve creating objects, adding textures, or defining dimensions, but these do not align with the specific design intent of the Shell tool, which focuses on modifying existing solid geometry to achieve a hollow version of that shape.