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cmux-customization

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Customize cmux for an end user. Use when changing cmux.json actions, custom commands, workspace layouts, plus-button behavior, surface tab bar buttons, Command Palette entries, Dock controls, sidebar and app settings, shortcuts, notifications, browser routing, examples-library presets, or Ghostty-backed terminal preferences.

ai_docs/cmux-skills/cmux-customization/SKILL.md

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# cmux Customization

Use this skill for user-facing cmux customization. Keep the user's config intact, prefer schema-backed edits, and validate before reporting completion.

## What Can Be Customized

- Custom actions: define reusable `actions` in `cmux.json`. Actions can appear in Cmd+Shift+P, surface tab bars, shortcuts, and the plus-button right-click menu.
- New workspace button: set `ui.newWorkspace.action` to replace the normal plus-button click, and `ui.newWorkspace.contextMenu` to control right-click actions. `ui.newWorkspace.rightClick` is accepted as an alias, but new examples should use `contextMenu`.
- Surface tab bar buttons: set `ui.surfaceTabBar.buttons` to replace the default tab bar buttons. Include built-in IDs such as `cmux.newTerminal`, `cmux.newBrowser`, `cmux.splitRight`, and `cmux.splitDown` only when they should stay visible.
- Workflows and layouts: use `commands` with workspace definitions to open a worktree, multiple checkouts, local services, browser previews, or SSH sessions in a deliberate split layout.
- Dock controls: create `.cmux/dock.json` or `~/.config/cmux/dock.json` for right-sidebar terminal controls such as logs, test watchers, git TUIs, dev servers, queues, or `cmux feed tui --opentui`.
- Sidebar and app behavior: use `cmux-settings` for supported settings such as appearance, sidebar display, notification behavior, browser routing, automation, shortcuts, and new-workspace placement.
- Workspace metadata: use the cmux CLI or `cmux-workspace` for workspace names, descriptions, colors, read state, and sidebar metadata updates.
- Feed and notifications: use `cmux hooks setup` for Feed event sources, notification settings for delivery behavior, and notification hooks in `cmux.json` for filtering or post-processing banners.