cmux

cmux is a native macOS terminal (Ghostty-based) with vertical tabs, notifications, and a scriptable CLI/socket API for managing multiple AI coding agent sessions in parallel. You use it to create isolated workspaces, monitor agent progress, send commands between workspaces, and build orchestration workflows.

When to use this skill

• Running multiple Claude Code agents in parallel (beyond git worktrees)
• /swarm or /nightshift needs terminal-level workspace management
• User wants to spawn, monitor, or communicate between agent sessions
• Setting up an orchestrator agent that controls other agents
• Configuring notifications for agent completion/attention events
• Automating browser interactions via cmux browser surfaces (navigation, forms, console, network, screenshots)
• Dogfooding or QA testing web apps using cmux's built-in browser

Hierarchy