Show HN: Ghostty-based terminal with vertical tabs and notifications (github.com)

A new macOS terminal application named cmux has been launched, designed specifically for AI coding agents. Built using Swift and AppKit rather than Electron, cmux promises faster startup times and lower memory usage. It integrates seamlessly with existing Ghostty configurations, allowing users to maintain their preferred themes and settings while introducing a sidebar with vertical tabs that display key information such as git branches, working directories, and notifications. The significance of cmux lies in its enhancement of the coding experience for developers utilizing AI tools like Claude Code and Codex. Its notification system is engineered to highlight when specific coding agents require attention, with visual cues and real-time updates that streamline multitasking across multiple terminal sessions. The in-app browser is fully scriptable, which enables tasks like DOM manipulation and form filling directly from the terminal. These features promote greater flexibility and efficiency, making cmux a powerful utility for AI developers looking to optimize their workflows.