Mask Tools is an add-on that expands masking capabilities within Blender's sculpt mode. It allows users to save and load sculpt masks directly to and from vertex groups, enabling better non-destructive mask management. The tool includes specialized functions for generating masks based on geometry edges or cavities. Additionally, it provides utility operations to duplicate, separate, delete, or apply displace modifiers directly from the active mask selection. The add-on interface is located in the 3D View sidebar under the Sculpt tab.