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 skills add manaflow-ai/cmux-skills --skill cmux-configgit clone --depth 1 https://github.com/manaflow-ai/cmux-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/manaflow-ai/cmux-skills/cmux-config)<a href="https://agentmods.dev/skills/manaflow-ai/cmux-skills/cmux-config"><img src="https://agentmods.dev/badge/skills/manaflow-ai/cmux-skills/cmux-config/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/manaflow-ai/cmux-skills/cmux-config"><img src="https://agentmods.dev/badge/skills/manaflow-ai/cmux-skills/cmux-config.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
What 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 5.1 | $0.00157 | $0.01188 |
| Opus 5.5 | $0.00063 | $0.00475 |
| Sonnet 5.5 | $0.00031 | $0.00238 |
| Haiku 4.5 | $0.00016 | $0.00119 |
Grade B, and why
cmux-config scanned grade B with 1 finding 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 2mo 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.
Subtle steeringmediumPrompt injection
Instructions that bias recommendations or shape behaviour without the user noticing.
- Never tell the user to restart cmux to apply a change; the watcher reloads on save. How it starts
The opening of the file, as written. The whole thing — 84 lines — stays where its author put it; the contents beside it link to each section on GitHub.
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. |
What ships with it
5 files 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.
- 2mo ago First seen · 84 lines · 157 tokens per session scan B 4a9386f8e6b2
cmux-config is a skill published in the GitHub repository manaflow-ai/cmux-skills (38 stars, last pushed 1mo ago), licensed MIT. It adds 157 tokens to every session and 1,188 once invoked, about $0.0006 per session on Opus 5.5. A static security scan graded it B with 1 finding (subtle steering). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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