Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/djrhails/dotfiles/cmux-customizationnpx skills add DJRHails/dotfiles --skill cmux-customizationgit clone --depth 1 https://github.com/DJRHails/dotfilesWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00080 | $0.02389 |
| Opus 5 | $0.00040 | $0.01195 |
| Sonnet 5 | $0.00016 | $0.00478 |
| Haiku 4.5 | $0.00008 | $0.00239 |
Grade A, and why
cmux-customization scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
This is a copy
98% identical to cmux-customization — 2 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 235 lines — stays where its author put it; the contents beside it link to each section on GitHub.
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
actionsincmux.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.actionto replace the normal plus-button click, andui.newWorkspace.contextMenuto control right-click actions.ui.newWorkspace.rightClickis accepted as an alias, but new examples should usecontextMenu. - Surface tab bar buttons: set
ui.surfaceTabBar.buttonsto replace the default tab bar buttons. Include built-in IDs such ascmux.newTerminal,cmux.newBrowser,cmux.splitRight, andcmux.splitDownonly when they should stay visible. - Workflows and layouts: use
commandswith 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.jsonor~/.config/cmux/dock.jsonfor right-sidebar terminal controls such as logs, test watchers, git TUIs, dev servers, queues, orcmux feed tui --opentui. - Sidebar and app behavior: use
cmux-settingsfor 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-workspacefor workspace names, descriptions, colors, read state, and sidebar metadata updates. - Feed and notifications: use
cmux hooks setupfor Feed event sources, notification settings for delivery behavior, and notification hooks incmux.jsonfor filtering or post-processing banners. - Team presets and examples: use project-local
.cmux/cmux.jsonand.cmux/dock.jsonto share worktree, SSH, review, dev, CI, and docs workspace patterns with a repo. - Import, export, and reset: back up the current config, apply the smallest diff, validate it, and keep a rollback path for user-owned customizations.
- Terminal behavior: use Ghostty config for fonts, themes, cursor style, copy-on-select, shell integration, terminal keybindings, and terminal rendering.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 3d ago First seen · 235 lines · 80 tokens per session scan A 04a2df61b54b
cmux-customization is a skill published in the GitHub repository DJRHails/dotfiles (2 stars, last pushed 8d ago), licensed MIT. It adds 80 tokens to every session and 2,389 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. It is 98% identical to cmux-customization, differing in 2 lines, and is treated as a copy.
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