Katherine Sheridan focused on stabilizing the Cut Tool in the Unity-Technologies/com.unity.probuilder repository, addressing a critical edge-case where placing two vertices on the same edge could cause crashes or unintended face creation. She applied her expertise in C#, Editor Scripting, and the ProBuilder API to implement a targeted fix that prevents these issues, ensuring the tool behaves predictably and maintains editor stability. Katherine also updated documentation and changelogs to support maintainability and transparency. Her work improved designer productivity by reducing interruptions from crashes, demonstrating a thoughtful approach to edge-case handling and reinforcing the reliability of the ProBuilder toolset.