cmux — AI-Native Terminal Multiplexer

Skill by ara.so — Daily 2026 Skills collection

cmux is a terminal multiplexer with a programmable socket API designed for AI coding agents. It provides full Playwright-equivalent browser automation, real-time terminal split management, sidebar status reporting, and agent team coordination — all via a simple CLI.

What cmux Does

• Terminal splits — create side-by-side or stacked panes, send commands, capture output
• Browser automation — full headless Chromium with snapshot-based element refs (no CSS selectors)
• Status sidebar — live progress bars, log messages, and icon badges visible to the user
• Notifications — native OS notifications from agent workflows
• Agent teams — coordinate parallel subagents, each with their own visible split

Orient Yourself