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Agent skill

cmux Dev Workflow

by manaflow-ai in manaflow-ai/cmux

Contributor workflow for the cmux macOS app: setup, tagged local builds, Xcode project normalization and sidebar extension tags.

Custom licenceAuto-check passedDevelopment

Install cmux Dev Workflow

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

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

GitHub CLI
$ gh skill install manaflow-ai/cmux cmux-dev-workflow --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-dev-workflow .claude/skills/cmux-dev-workflow && 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-dev-workflow
GitHub stars
28k
Token cost
~715 tokens
SKILL.md length
288 words
Files
5 (incl. references)
Skills in repo
22
Repo updated
First seen
Licence
Custom licence

At a glance

Contributor workflow for the cmux macOS app: setup, tagged local builds, Xcode project normalization and sidebar extension tags.

  • Preparing a tagged local build of cmux after changing native code
  • SKILL.md covers Scope and routing, Tagged local development, Toolchain and project files and Sidebar extension tags
  • Calls python3
  • Setting up a cmux checkout for the first time

What it does

Repository commands run only from a trusted checkout, since even verify-local.py --help loads repository code. Fast feedback starts with python3 scripts/verify-local.py. For native app or build-input changes, the agent builds with a tag through ./scripts/reload.sh, which builds without launching unless --launch is added. Tags isolate bundle IDs, sockets and build output, so bare xcodebuild and an untagged DEV app are off limits, and the agent never quits or relaunches your running cmux.

The setup script initializes submodules, builds GhosttyKit and installs a pre-commit hook that normalizes staged project files and registers new Python tests. After project edits the agent runs verify-local.py --only project, and toolchain pin changes are treated as team decisions. Sidebar extensions need a distinct extension-point ID, bundle-ID suffix and display-name suffix per tag and are built with scripts/reload-extension.sh. Three reference files cover tags, normalization and extension tagging.

When your agent uses it

  • Preparing a tagged local build of cmux after changing native code
  • Setting up a cmux checkout for the first time
  • Normalizing the Xcode project file after editing it
  • Building a sidebar extension under its own tag

Example prompts

  • “Build cmux with the tag sidebar-fix and launch it so I can check the change.”
  • “Run the local verification for my project file edits.”
  • “Set up this checkout for native cmux development.”

Requirements

  • A trusted cmux checkout on macOS with Xcode
  • Python 3 for the verification scripts

What it can do on your machine

Read from SKILL.md and the folder at commit b98fdc2. 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

    Shell commands in SKILL.md call:

    • python3

    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 Dev Workflow loads about 715 tokens when it runs, and up to ~2.3k if it reads all its reference files. Until then it costs about 49 tokens; SKILL.md has 288 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~49
When it runs · the whole SKILL.md, loaded when a task matches
~715
With references · SKILL.md plus every file in references/, read only if the agent opens them
~2.3k

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 288 words (~715 tokens).

“Run repository commands only from a trusted checkout; even verify-local.py --help and --list load repository code.”

— opening of SKILL.md by manaflow-ai, Custom licence
name
cmux-dev-workflow

Read the full SKILL.md on GitHub

Files

SKILL.md and 4 other files (references) in skills/cmux-dev-workflow of manaflow-ai/cmux.

  • SKILL.md
  • agents/openai.yaml
  • references/sidebar-extension-tagging.md
  • references/tagged-builds.md
  • references/xcode-project-normalization.md

Open the folder on GitHubat commit b98fdc2

Compare with similar skills

cmux Dev Workflow 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 Dev Workflow compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
cmux Dev Workflow this skillmanaflow-ai/cmux28k—~715Automated safety check: PassCustom licence
Code Qualitynotque/vexjoy-agent438—~1.5kAutomated safety check: NotesMIT
Code Qualitywaybarrios/opencode-power-pack533—~1.8kAutomated safety check: PassMIT
Checkav1155/houndarr292—~366Automated safety check: PassAGPL-3.0
Xcstrings ManagerEslzzyl/Pixiv-SwiftUI111—~482Automated safety check: PassAGPL-3.0
Review Pre Commitopenwpm/OpenWPM1.4k—~788Automated safety check: PassCustom licence

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More from manaflow-ai/cmux

All 22 skills in this repo

  • cmux Diagnostics

    manaflow-ai/cmux

    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
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  • 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
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  • Ghostty Submodule and GhosttyKit Workflow

    manaflow-ai/cmux

    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
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  • 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~830 tokens
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Works with

Categories

Questions about cmux Dev Workflow

What does cmux Dev Workflow do?

Contributor workflow for the cmux macOS app: setup, tagged local builds, Xcode project normalization and sidebar extension tags. py --help loads repository code.py.

When should I use cmux Dev Workflow?

cmux Dev Workflow fits situations like: preparing a tagged local build of cmux after changing native code; setting up a cmux checkout for the first time; normalizing the Xcode project file after editing it; building a sidebar extension under its own tag.

How do I install cmux Dev Workflow in Claude Code?

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

How do I install cmux Dev Workflow in Codex?

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

Can I use cmux Dev Workflow 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-dev-workflow -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-dev-workflow, .gemini/skills/cmux-dev-workflow, .github/skills/cmux-dev-workflow and .opencode/skills/cmux-dev-workflow in your project.

What does cmux Dev Workflow need to run?

Going by SKILL.md and its folder, cmux Dev Workflow needs the command-line tools its instructions call (python3). Our summary lists: A trusted cmux checkout on macOS with Xcode; Python 3 for the verification scripts.

Does cmux Dev Workflow 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 Dev Workflow 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 Dev Workflow use?

cmux Dev Workflow 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 Dev Workflow use?

About 715 tokens (SKILL.md is roughly 2.9k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.6k tokens, read only when the agent opens those files.

What are the alternatives to cmux Dev Workflow?

Skills that share tags, products or a category with cmux Dev Workflow: Code Quality (notque/vexjoy-agent, 438 stars), Code Quality (waybarrios/opencode-power-pack, 533 stars), Check (av1155/houndarr, 292 stars) and Xcstrings Manager (Eslzzyl/Pixiv-SwiftUI, 111 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains cmux Dev Workflow?

manaflow-ai (a GitHub organization) maintains it in manaflow-ai/cmux, which has 27,914 GitHub stars. The repository holds 22 skills in this directory. The repository was last updated on October 8, 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.