During December 2025, Adam Krieger focused on maintaining stability in the facebook/buck2 and facebook/buck2-prelude repositories by reverting the no-SAN constraint migration. He coordinated a cross-repository rollback to restore previous constraint behavior, ensuring compatibility for existing users and downstream dependencies. Using Python and his expertise in backend development and build system management, Adam validated build stability and minimized disruption to ongoing workflows. He documented the changes thoroughly for auditability, providing clear references for future maintenance. This work emphasized careful configuration management and testing, prioritizing product reliability and reducing maintenance costs by avoiding disruptive migrations during the update process.