cmux — Native macOS Terminal for AI Coding Agents
About cmux
cmux is a free, open-source native macOS terminal built on libghostty (Ghostty rendering engine) with vertical tabs, split panes, notification rings, and a built-in scriptable browser — designed for managing multiple parallel AI coding agents like Claude Code, Codex, and Gemini CLI.
Key Capabilities
Native macOS terminal (Swift + AppKit) with GPU-accelerated rendering via libghostty
Vertical tabs showing git branch, PR status, ports, and notification text per workspace
Built-in scriptable browser for previewing and automating web interactions alongside terminal
Notification rings alert you when any agent needs attention across parallel sessions
Works with Claude Code, Codex, OpenCode, Gemini CLI, Kiro, Aider, and any CLI tool
Standout Features
Vertical Tabs
Sidebar shows git branch, PR status, working directory, ports, and latest notification for each workspace.
Notification Rings
Panes highlight when agents need attention — supports OSC 9/99/777 and cmux notify CLI.
Built-in Browser
Scriptable browser surface next to terminal — open URLs, take snapshots, click elements, fill forms via CLI.
GPU Rendering
Powered by libghostty for fast, native rendering with zero Electron overhead.
Full CLI & Socket API
Automate everything via cmux CLI commands and socket API for agent hook integration.
Perfect for
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