Which of the following tools is primarily used to add complex or simple features to assemblies?

The Feature Tool is specifically designed for adding features to assemblies, whether they are complex or simple. In the context of CAD software, features refer to the operations or elements that define the geometry of a model, such as holes, bosses, cuts, or extrusions. Utilizing the Feature Tool allows users to create these characteristics accurately and efficiently within an assembly.

This tool is integral to the design process as it enhances the functionality and detail of an assembly, enabling designers to implement necessary components and ensure proper fit and function. As assemblies may consist of multiple parts that interact with one another, the precise addition of features becomes crucial to achieving a well-designed product.

Other options represent different functionalities that do not directly align with the primary purpose of adding specific features to assemblies. For instance, the Assembly Tool focuses on managing and organizing components of an assembly rather than defining the features themselves. The Design Modeler typically serves broader modeling tasks, which can include but are not limited to feature creation. The Sketch Tool is essential for creating 2D outlines and profiles but does not directly apply to the process of adding features to existing assemblies, making it less relevant for this specific task.