Cmux

If you're orchestrating parallel tasks or subagents in Claude Code, this gives you programmatic control over terminal splits, command execution, and output capture. It's a Unix socket CLI for managing panes, surfaces, and workspaces, so you can spawn a split, send commands with `cmux send`, read results with `read-screen`, and clean up when done. The gotcha that'll bite you: `send` doesn't press Enter, and `read-screen` without `--scrollback` only shows what's visible, not what scrolled off. Most useful when you need isolated terminal environments for concurrent operations rather than just running shell commands in your current terminal.

Install to Claude Code

npx -y skills add absolutelyskilled/absolutelyskilled --skill cmux --agent claude-code