cmux-config
Configure cmux through /.config/cmux/cmux.json: settings (appearance, sidebar, notifications, automation, browser, shortcuts, set/get/validate by JSON path), customization (tab bar buttons, plus-button click and right-click menus, custom actions/commands/menus, right sidebar), and sidebar workspace groups (anchor workspaces, group CLI/socket ops, per-cwd group config). Triggers: 'cmux config', 'cmux.json', 'change cmux setting', 'set in cmux', 'rebind a cmux shortcut', 'cmux-customize', 'customize cmux', 'tab bar button', 'add cmux action', 'workspace group', 'group sidebar', 'anchor workspace', 'workspaceGroups'.
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Install
Works with every agent the skills CLI supports.
npx skills add https://github.com/manaflow-ai/cmux-skills --skill cmux-config- 01
Install
Run the command in your project. The CLI asks which agents to install for.
- 02
Describe the task
Ask your agent for something this skill covers. It loads cmux-config automatically when relevant.
- 03
Review the result
The agent follows the SKILL.md steps, scripts and references bundled with the skill.
SKILL.md
The instructions your agent reads when the skill is triggered.
cmux-config
Single entry point for editing a user's cmux configuration in
~/.config/cmux/cmux.json (JSONC). The app watches the file; saving applies
changes immediately, no restart. Legacy ~/.config/cmux/settings.json is read
only as a fallback for keys absent from cmux.json.
Three areas, each with a reference:
- Settings — typed preferences under
app,terminal,notifications,sidebar,sidebarAppearance,workspaceColors,automation,browser,shortcuts. See the helper below and references/all-keys.md / references/shortcut-actions.md. - Customization — structural config:
actions,ui.surfaceTabBar.buttons,ui.newWorkspace(plus-button click + context menu),commands,rightSidebar,vault. See references/customize.md. - Workspace groups — collapsible anchor-owned sidebar sections via the
cmux workspace groupCLI / socket API andworkspaceGroupsconfig. See references/groups.md.
Helper script
Use the bundled helper for every settings/customize read and write. It strips JSONC comments, writes atomically, and validates keys against the schema. From the installed skill directory:
./scripts/cmux-settings <subcommand>
For brevity below, assume it is on $PATH as cmux-settings (e.g.
export PATH="$HOME/.claude/skills/cmux-config/scripts:$PATH").
| Command | What it does |
|---|---|
cmux-settings path | Print the config path. |
cmux-settings dump [--no-comments] | Print the raw file (or parsed JSON). |
cmux-settings get <a.b.c> | Print value at dotted JSON path. |
cmux-settings set <a.b.c> <value> | Set value (<value> parsed as JSON; bare words stored as strings). |
cmux-settings unset <a.b.c> | Delete key, reverting to the in-app default. |
cmux-settings list-supported | List every settings JSON path the app recognizes. |
cmux-settings validate | Parse the file and flag unknown settings keys. |
cmux-settings open | Open cmux.json in $EDITOR / VS Code / Cursor / TextEdit. |
--file <path> overrides the target file (use for the legacy settings.json).
Schema: https://raw.githubusercontent.com/manaflow-ai/cmux/main/web/data/cmux.schema.json.
Workflow
- If the user named a setting in plain English, look it up first:
cmux-settings list-supported | rg -i '<keywords>'. - Make the smallest edit (settings/customize via the helper; groups via the
cmux workspace groupCLI in references/groups.md). - Verify by surface:
- Typed settings: read back (
cmux-settings get <path>) andcmux-settings validate. - Customization (
actions,ui.*,commands,vault,rightSidebar): read back the exact key (cmux-settings get <path>) and confirm the file still parses (cmux-settings dump --no-comments). Do NOT rely onvalidatehere: it skips structural sections, so a typo likeui.surfaceTabbar.buttonspasses validation yet cmux ignores it. Check the key against references/customize.md. - Groups:
cmux workspace group list(the settings validator does not recognizeworkspaceGroups).
- Typed settings: read back (
- Tell the user it auto-reloaded on save. No app restart. Revert with
cmux-settings unset <key>.
Rules
- Only edit
cmux.json. Never editsettings.jsonunless asked; it is legacy. - Never tell the user to restart cmux to apply a change; the watcher reloads on save.
- Do not blindly overwrite top-level structural sections (
actions,ui,commands,vault,rightSidebar); they hold hand-tuned non-settings config. - Color values are
#RRGGBB; opacities are0..1. - Shortcut action ids must match the schema enum; look them up in references/shortcut-actions.md before binding.
- Do not run a tagged app reload for config-only or skill-only changes.
- For workspace groups prefer CLI/socket operations over editing session JSON, and preserve anchor semantics (see references/groups.md).
FAQ
What does the cmux-config skill do?
Configure cmux through /.config/cmux/cmux.json: settings (appearance, sidebar, notifications, automation, browser, shortcuts, set/get/validate by JSON path), customization (tab bar buttons, plus-button click and right-click menus, custom actions/commands/menus, right sidebar), and sidebar workspace groups (anchor workspaces, group CLI/socket ops, per-cwd group config). Triggers: 'cmux config', 'cmux.json', 'change cmux setting', 'set in cmux', 'rebind a cmux shortcut', 'cmux-customize', 'customize cmux', 'tab bar button', 'add cmux action', 'workspace group', 'group sidebar', 'anchor workspace', 'workspaceGroups'.
How do I install cmux-config?
Run npx skills add https://github.com/manaflow-ai/cmux-skills --skill cmux-config in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/cmux-config/ (personal) or .claude/skills/cmux-config/ (project).
Which AI agents can use cmux-config?
Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.
Is cmux-config safe to install?
No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.
Who maintains cmux-config?
It is published by manaflow-ai in manaflow-ai/cmux-skills. It has 702 recorded installs.
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