Mattia Bandini developed a new command-line tool, selinux-explain, for the rust-lang/this-week-in-rust repository, focusing on translating SELinux AVC denials to streamline debugging and security triage. Working in Rust and Markdown, Mattia implemented the tool to reduce time-to-debug for SELinux issues and improve onboarding for contributors dealing with security workflows. The project involved updating documentation and release notes to ensure clarity and maintainability. Co-authoring with Ben Dillon, Mattia demonstrated effective collaboration and attention to code quality. The work reflects a targeted, well-scoped engineering effort, delivering a practical CLI solution that enhances developer productivity in security-focused environments.