GitLab Duo CLI is a new command-line interface that integrates agentic AI into the software development lifecycle, offering two operational modes: an interactive chat mode and a headless mode designed for automation. This tool aims to enhance CI/CD workflows and software development processes by enabling developers to execute commands with proper security and approval measures in place. It represents a shift towards using CLI tools for broader software development tasks as opposed to traditional IDE environments, making processes more efficient and transparent.