The GitHub Copilot Agent Mode is a significant upgrade to GitHub Copilot, leveraging autonomous agent technology to allow developers to complete complex programming tasks more efficiently. The Agent Mode can automatically iterate on code, identify and correct errors, and even infer additional steps needed to complete tasks. Its primary benefits include reducing repetitive work, enhancing code quality, and improving overall development efficiency. The Agent Mode supports multiple language models, such as Google's Gemini 2.0 Flash, and utilizes secure sandbox technology to ensure code safety. It is ideal for developers needing to rapidly develop and optimize code, especially teams working on complex projects.