Xu Lu worked on the hafs-community/HAFS repository, focusing on maintaining GSI compatibility following the bufr 12.0 upgrade. During this period, Xu addressed a critical bug by updating the ufbqcd subroutine to correctly handle integer data types, ensuring reliable data assimilation workflows. The work involved reverting unsupported isnan usage in vtcd, which was no longer valid for integer types, and aligning submodule references to the latest development phase. Xu’s efforts centered on bug fixing and submodule management using Git, demonstrating a methodical approach to system reliability and compatibility rather than feature development during this month-long contribution.