Zafar Ashurbekov enhanced the golang/tools repository by strengthening the slicedelete analysis within the modernize toolchain used by gopls. He implemented a safety check that ensures slice expressions are free of side effects before automated refactoring is triggered, addressing a subtle source of unintended behavior. Using Go and applying expertise in static analysis and compiler internals, Zafar also resolved an issue where slicedelete triggers could act on slice identifiers with side effects. This work improved the reliability and safety of code modernization workflows, reducing regression risk and increasing developer confidence in automated refactoring processes within the Go ecosystem.