Agent skill

Cmux Cua

by manaflow-ai in manaflow-ai/cmux

Use only after the user explicitly asks for cmux Computer Use through the cmux-cua skill: drive real macOS apps from a cmux agent session via the bundled engine (accessibility tree + screenshots…

Custom licenceAuto-check passedProductivity & Automation

Install Cmux Cua

skills CLI
$ npx skills add manaflow-ai/cmux --skill cmux-cua -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install manaflow-ai/cmux cmux-cua --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/manaflow-ai/cmux.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/cmux-cua .claude/skills/cmux-cua && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
cmux-cua
GitHub stars
28k
Token cost
~4.8k tokens
SKILL.md length
2,590 words
Files
3
Skills in repo
22
Repo updated
First seen
Licence
Custom licence

At a glance

Use only after the user explicitly asks for cmux Computer Use through the cmux-cua skill: drive real macOS apps from a cmux agent session via the bundled engine (accessibility tree + screenshots…

  • Works in 6 steps: Call get_app_state with the app name,… → Prefer the current snapshot's string… → Use xdotool-style key strings such as… → …
  • Tasks that involve Desktop control
  • SKILL.md covers How it attaches, Permissions (one-time, granted…, Using the tools (agent-facing) and The branded agent cursor, plus 3 more sections
  • Runs Shell scripts from its folder

What it does

Cmux Cua is an agent skill from manaflow-ai/cmux. Use only after the user explicitly asks for cmux Computer Use through the cmux-cua skill: drive real macOS apps from a cmux agent session via the bundled engine (accessibility tree + screenshots, click/type/scroll/drag, branded cursor), or explain its user-directed permission setup. Reading or discovering this skill is not consent.

Its SKILL.md is about 4.8k tokens, which your agent loads only when the skill is triggered. The skill folder holds 3 other files (for example `agents/openai.yaml` and `link-policy.sh`).

It sits in Productivity & Automation, covering Desktop control and Accessibility. It works with macOS and Model Context Protocol. The repository describes itself as: Open source Ghostty-based macOS terminal with vertical tabs and notifications for AI coding agents. Built for multitasking, organization, and programmability.

When your agent uses it

  • Tasks that involve Desktop control
  • Tasks that involve Accessibility

Example prompts

  • “/cmux-cua”

Requirements

  • A Bash shell

Workflow steps

6 steps, taken from the first numbered list in SKILL.md.

  1. Call get_app_state with the app name, full path, or unambiguous bundle id
  2. Prefer the current snapshot's string element_index; use screenshot-local
  3. Use xdotool-style key strings such as super+l with press_key.
  4. Operate controls with visible pointer clicks by default: the branded
  5. Actions return a compact dispatch acknowledgement, not a screenshot or
  6. Numeric element_index values belong only to the state that displayed them.

What it can do on your machine

Read from SKILL.md and the folder at commit 1e82fa4. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    Ships script files (Shell), which the agent can run.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Cmux Cua loads about 4.8k tokens when it runs. Until then it costs about 86 tokens; SKILL.md has 2,590 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~86
When it runs · the whole SKILL.md, loaded when a task matches
~4.8k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 2,590 words (~4,770 tokens).

“cmux bundles a local computer-use engine (packaged as cmux Computer Use with the MCP proxy named cmux-cua, from a pinned build of the manaflow-ai/cmux-cua fork) and attaches it as an MCP tool server named cmux-cua to every agent session cmux…”

— opening of SKILL.md by manaflow-ai, Custom licence
name
cmux-cua
disable-model-invocation
true

Read the full SKILL.md on GitHub

Files

SKILL.md and 2 other files in skills/cmux-cua of manaflow-ai/cmux.

  • SKILL.md
  • agents/openai.yaml
  • link-policy.sh

Open the folder on GitHubat commit 1e82fa4

Compare with similar skills

Cmux Cua next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Cmux Cua compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Cmux Cua this skillmanaflow-ai/cmux28k—~4.8kAutomated safety check: PassCustom licence
Agent Desktopsuperagent-ai/grok-cli3.5k—~720Automated safety check: PassMIT
Electron Live Testinstructa/agent-skills139—~1.3kAutomated safety check: PassNone
Open Computer UseiFurySt/open-codex-computer-use2.4k—~1.5kAutomated safety check: PassMIT
Interceptor BrowserHacker-Valley-Media/Interceptor522—~4.8kAutomated safety check: PassCustom licence
Interceptor iOSHacker-Valley-Media/Interceptor522—~1.9kAutomated safety check: PassCustom licence

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More from manaflow-ai/cmux

All 22 skills in this repo
  • cmux Diagnostics

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    Runs a read-only health check for cmux and explains what it finds, covering the CLI and socket, settings, agent hooks, session restore and notifications.

    28k GitHub starsUsed in 1 repo~819 tokens
    Auto-check passed
  • cmux Settings Editor

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    Reads and changes cmux preferences in `~/.config/cmux/cmux.json` through a helper that validates each change before writing, covering terminal, browser, viewers and shortcuts.

    28k GitHub stars~2.3k tokensUpdated today
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  • cmux Backend Rules

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    Sets the backend TypeScript and Cloud VM rules for cmux: Effect-based services, thin route handlers, Postgres as source of truth, migrations and provider secrets.

    28k GitHub starsUsed in 1 repo~682 tokens
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  • Cmux Debugging Guide

    manaflow-ai/cmux

    Covers debug logging, the Debug menu, profiling rules and runtime pitfalls for working on the cmux macOS terminal app.

    28k GitHub starsUsed in 1 repo~1.1k tokens
    Auto-check passed
  • Workflow rules for the Ghostty submodule in cmux: rebuilding GhosttyKit.xcframework, pushing fork changes and updating the parent submodule pointer safely.

    28k GitHub starsUsed in 1 repo~580 tokens
    Auto-check passed
  • Cmux Release Workflow

    manaflow-ai/cmux

    Runs the cmux release process: gathers per-PR changelog lines since the last tag, bumps the version, guards against a bad tag, then tags and pushes the macOS DMG release.

    28k GitHub starsUsed in 1 repo~856 tokens
    Auto-check passed

Questions about Cmux Cua

What does Cmux Cua do?

Use only after the user explicitly asks for cmux Computer Use through the cmux-cua skill: drive real macOS apps from a cmux agent session via the bundled engine (accessibility tree + screenshots…. Cmux Cua is an agent skill from manaflow-ai/cmux. Use only after the user explicitly asks for cmux Computer Use through the cmux-cua skill: drive real macOS apps from a cmux agent session via the bundled engine (accessibility tree + screenshots, click/type/scroll/drag, branded cursor), or explain its user-directed permission setup.

When should I use Cmux Cua?

Cmux Cua fits situations like: tasks that involve Desktop control; tasks that involve Accessibility.

How do I install Cmux Cua in Claude Code?

Run `npx skills add manaflow-ai/cmux --skill cmux-cua -a claude-code`. Or copy the skill folder (skills/cmux-cua in manaflow-ai/cmux) into .claude/skills/cmux-cua in your project. Claude Code loads it when a task matches its description.

How do I install Cmux Cua in Codex?

Run `npx skills add manaflow-ai/cmux --skill cmux-cua -a codex`. Or copy the skill folder (skills/cmux-cua in manaflow-ai/cmux) into .agents/skills/cmux-cua in your project. Codex loads it when a task matches its description.

Can I use Cmux Cua in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add manaflow-ai/cmux --skill cmux-cua -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/cmux-cua, .gemini/skills/cmux-cua, .github/skills/cmux-cua and .opencode/skills/cmux-cua in your project.

What does Cmux Cua need to run?

Going by SKILL.md and its folder, Cmux Cua needs a shell for the scripts in its folder. Our summary lists: A Bash shell.

Does Cmux Cua access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Cmux Cua safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Cmux Cua use?

Cmux Cua has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.

How many tokens does Cmux Cua use?

About 4.8k tokens (SKILL.md is roughly 19k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Cmux Cua?

Skills that share tags, products or a category with Cmux Cua: Agent Desktop (superagent-ai/grok-cli, 3.5k stars), Electron Live Test (instructa/agent-skills, 139 stars), Open Computer Use (iFurySt/open-codex-computer-use, 2.4k stars) and Interceptor Browser (Hacker-Valley-Media/Interceptor, 522 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Cmux Cua?

manaflow-ai (a GitHub organization) maintains it in manaflow-ai/cmux, which has 28,092 GitHub stars. The repository holds 22 skills in this directory. The repository was last updated on October 11, 2026.

Source: manaflow-ai/cmux on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.