Grease Pencil Shape Builder is a procedural tool for creating adjustable 2D primitives in Blender. Designed specifically for Grease Pencil v3, it allows users to generate shapes like rectangles with precise, adjustable rounded corners without manually plotting and editing points.

The system operates via Geometry Nodes and can be activated as a standard tool in Draw, Edit, Sculpt, and Object modes. By keeping the shapes procedural, users can dynamically modify dimensions and corner bevels, as well as animate the changing parameters as an alternative to standard stroke interpolation. The package includes an 11-page PDF manual outlining usage techniques.