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cmux-customization — Claude Code skill: what it does, how to install

Configures the cmux workspace manager: edits cmux.json, wires Command Palette actions, sets dock terminals, and routes terminal-level styling directly to Ghostty.

Install into Claude Code · Skills CLI (Vercel) All methods and platforms ↓ 
npx skills add manaflow-ai/cmux --skill cmux-customization -a claude-code
Open on GitHub

What cmux-customization does

The skill directs an AI coding agent through editing cmux layouts and viewer preferences. Before touching any file, it inspects existing setups across global paths like ~/.config/cmux/cmux.json and project-level .cmux/cmux.json, making a timestamped backup copy first. App settings and shortcuts run through the schema-aware cmux-settings helper, while terminal-level rendering options such as fonts or color schemes are routed straight to Ghostty configuration instead of invented cmux settings.

Custom actions, tab bar buttons, right-click menus, and workspace split layouts are written directly into JSONC. Project-local entries override global IDs with the same name, which keeps repository-specific dev server or watcher docks isolated. Once changes are written, the agent runs schema validation and triggers cmux reload-config to apply them immediately. Hardcoding API tokens or secrets in command definitions is strictly avoided in favor of environment variables.

What it helps with

  • add custom actions and agent launchers to the Command Palette
  • configure workspace split layouts and dock terminals in .cmux/dock.json
  • route terminal links and markdown files to internal cmux viewers
  • migrate fonts and terminal color palettes from iTerm2, Alacritty, or Kitty
  • validate JSONC syntax and reload cmux configuration safely

Example prompts for the agent

  • Add a new action in cmux Command Palette to run git status in a split pane
  • Configure the cmux plus button to open a project dev workspace by default
  • Route terminal URLs to the built-in cmux browser in ~/.config/cmux/cmux.json

How to install cmux-customization

1Skills CLI (Vercel)

npx skills add manaflow-ai/cmux --skill cmux-customization -a claude-code

2Manually: put the files in place

~/.claude/skills/cmux-customization/SKILL.md

Copy the whole skill folder; for one project use .claude/skills/cmux-customization/

From the same set12

The whole set →
cmux manaflow-ai Skill for navigating multi-pane cmux layouts: create windows, workspaces, splits, focus surfaces, and move terminals and browser panels without breaking automation. Use it when an agent needs deterministic placement and routing. Claude Code CX Codex Cursor +1 9,600installs cmux-browser manaflow-ai Automates browser surfaces via the cmux CLI without stealing user focus. Useful for background page inspections, waiting on selectors, and form fills. Claude Code CX Codex Cursor +1 8,800installs cmux-diagnostics manaflow-ai Skill runs read-only cmux diagnostics: sockets, hooks, session restore, settings. Use when notifications fail, agents don't resume, or you need a support-safe debug report. Claude Code CX Codex Cursor +1 6,400installs cmux-keyboard-shortcuts manaflow-ai Configures cmux shortcuts in ~/.config/cmux/cmux.json. Useful for adopting tmux-style chords, auditing overrides, and validating syntax. Claude Code CX Codex Cursor +1 6,200installs cmux-testing manaflow-ai Skill for choosing verification scopes, adding tests, and validating Swift test targets in the cmux project. Decides what local and CI evidence a change needs. Claude Code CX Codex Cursor +1 4,900installs cmux-custom-sidebar manaflow-ai Skill for writing a custom cmux sidebar in a SwiftUI-like language. The sidebar binds to workspaces, tabs, PRs, and clock; hot-reloads on save; runs cmux commands on tap. Claude Code CX Codex Cursor +1 4,800installs cmux-architecture manaflow-ai Guides modular Swift package architecture, strict 5-layer dependency inversion, and Swift 6 concurrency rules in the cmux codebase. Claude Code CX Codex Cursor +1 4,800installs cmux-ghostty manaflow-ai Enforces workflow guidelines for the Ghostty submodule and GhosttyKit compilation in cmux. Useful when syncing the fork or committing submodule pointers. Claude Code CX Codex Cursor +1 4,700installs

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Questions about cmux-customization

How to install cmux-customization in Claude Code?

Run npx skills add manaflow-ai/cmux --skill cmux-customization -a claude-code in your terminal.

What does the cmux-customization skill do?

It instructs your assistant how to safely edit cmux.json and .cmux/dock.json, manage backups, and validate changes with cmux reload-config.

When does the skill modify Ghostty instead of cmux.json?

Terminal fonts, cursor styles, color themes, and terminal keybindings belong in Ghostty config; the skill routes those edits to Ghostty rather than creating unsupported cmux keys.

See also

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