VERTEX TOOL applies rounding algorithms to a shape by placing two (in some cases more) new vertices in place of original one at selected corner, based on a specified line length. There are 12 corner rounding algorithms to choose from.

Rounding method can be applied based on Radius or Percentage. Radius is the distance from selected vertex (or a radius of a sphere, if it was fully drawn) and Percentage is the distance between selected and neighboring vertices.

To avoid shape distortion when animating from initial shape to a new one, use Animate feature and set the transition duration in frames. This is important when using rounding method that adds 3 or more vertices (step, bubble, pinch).

Store Shape Data option reads shape data (coordinates of vertices, in/out tangents) and stores it in shapes expression field. This way you are able to restore original shape at any time with Restore Shape button.

Home Page - https://aescripts.com/vertex-tool/