Yiyin Gu focused on improving the stability of the Gradient tool in the GraphiteEditor/Graphite repository by addressing a key issue affecting user experience. During April 2025, Yiyin implemented a targeted bug fix that restricts the Gradient tool’s functionality to vector elements, preventing its application on raster images. This was achieved by adding guard checks within the tool’s update logic and application pipeline, ensuring gradients cannot be mistakenly applied to raster layers. Working primarily with Rust and leveraging expertise in image editing software and vector graphics, Yiyin’s contribution enhanced the reliability and clarity of the tool’s workflow for end users.