cmux is a macOS terminal application designed specifically for working with AI coding agents. Built on Ghostty, it provides a specialized environment optimized for multitasking scenarios where developers interact with AI assistants during their coding workflow.

The terminal includes vertical tabs for organizing multiple sessions, a notification system that alerts users when AI agents need attention, and a built-in browser component. When Claude Code requires user interaction, the relevant pane glows blue and the sidebar provides context about why attention is needed. The application supports workspace management with features like tab colors, pane zooming capabilities, and command palette functionality.

cmux operates as a native macOS application built using Swift and AppKit, avoiding Electron/Tauri frameworks for better performance. It includes CLI integration with 89 commands covering workspace management, browser control, pane operations, and notification handling. The application supports split-screen layouts with zoom toggle functionality and maintains compatibility with various keyboard layouts.

The terminal provides benefits for developers working with AI coding assistants by streamlining the interaction workflow and reducing context switching. It enables efficient multitasking between coding sessions and AI agent communications through its notification system and organized tab interface.

Target users include developers who regularly work with AI coding agents like Claude Code. The application integrates with macOS native frameworks and provides extensive CLI capabilities for automation and scripting purposes.