Use this skill to control the cmux terminal app from Claude Code. Trigger on "cmux", "open browser pane", "split pane", "browser split", "open in browser", "cmux browser", "cmux notify", "cmux split", "새 pane 열어", "브라우저 열어", "알림 보내", "사이드바", "workspace 만들어", "pane 분할", "browser automation", "cmux에서", "cmux로", "cmux 사용해서". Also trigger when the user wants to open a URL alongside their terminal, send notifications when a task completes, manage terminal panes programmatically, automate browser interactions from the CLI, or set sidebar status/progress for build scripts. Do NOT trigger for general tmux commands — cmux is a different app. If cmux is not detected (no socket, no CLI), inform the user and skip.
Use this skill for ANY multi-pane or multi-agent terminal orchestration in cmux. Required when the user wants to: run things in parallel in separate terminal panes, split the terminal, spawn a sub-agent (Claude Code, Codex) in another pane, fan out tasks across splits, send keystrokes or text to another pane (including ctrl-c), read terminal output from another pane, update sidebar status or progress bar, open a URL in cmux's built-in browser pane, or display markdown preview alongside the terminal. The cmux CLI is the ONLY way to do these things — Bash cannot split panes or spawn agents. Trigger phrases: 'in parallel', 'split pane', 'spawn agent', 'fan out', 'new pane', 'browser pane', 'sidebar', 'send to pane', 'read from pane', 'show the plan', 'ctrl-c to', '分屏', '并行', '开个 pane'. NOT for: single command execution, basic bash operations, or questions about tmux.