Cesar Sagaert developed cross-shell command-line autocompletion for the Niri CLI in the YaLTeR/niri repository, focusing on improving usability and onboarding for new users. He implemented shell completions for Bash, Fish, and Zsh, leveraging his skills in shell scripting and command line tools to streamline the user experience. Additionally, Cesar prepared the project for COPR packaging, laying the groundwork for easier distribution and installation. His work addressed the friction often encountered with CLI tools by providing intuitive autocompletion and packaging support. The contribution was delivered as a focused feature, demonstrating depth in package management and shell scripting within a short timeframe.