cmux SKILL.md skillA
cmux from davidondrej/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add davidondrej/skills/cmux@git:20260925.cb72780Pins git:20260925.cb72780 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- davidondrej/skills
- Path
skills/agent-orchestration/cmux/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260925.cb72780, committed Sep 25, 2026
- First version recorded
- Sep 5, 2026
- Size
- 4,885 bytes
- Repository stars
- 4,161
- License
- MIT
Control the cmux macOS terminal app: workspaces, panes, surfaces, browsers, notifications, settings, and hooks. Use only when the user explicitly names cmux. Read before running any cmux command.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# cmux Control macOS 14.0+. Prefer the CLI; if `cmux` is not on PATH, use `/Applications/cmux.app/Contents/Resources/bin/cmux`. ## Targeting and safety **Window → workspace → pane → surface:** macOS window → sidebar project/branch tab → split region → terminal, browser, or Markdown tab. - **Anchor to the caller's `CMUX_WORKSPACE_ID`.** Never assume the visually focused workspace is the target. Outside cmux, identify the intended workspace before acting. - **Use prefixed refs or UUIDs.** `workspace:2`, `pane:1`, `surface:7`; bare numbers are indexes, not IDs. Output defaults to refs; `--id-format uuids|both` includes UUIDs. - **Refresh targets.** Surface refs are global, not workspace-local. Re-list before reusing them; check `cmux surface-health` before sending input when state may be stale. - **Preserve focus.** Pass `--focus false` wherever supported. Use `select-workspace`, `focus-pane`, `focus-panel`, or `focus-surface` only on explicit user request. - **Respect ownership.** Never send input to surfaces you do not own. Stay in the caller's workspace unless the user explicitly requests cross-workspace routing. …
Read the whole file at its exact version.
How to install
mdr add davidondrej/skills/cmux@sha256:57dae426aabc7bf7The line at the top of this page pins the label git:20260925.cb72780, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_uq3jyl2odut53ln4)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Sep 5, 2026 and Sep 25, 2026, about one every 10 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260925.cb72780 latest | 2026-09-25 | cb72780 | 4,885 B | A | view · diff |
| git:20260906.6a656fc | 2026-09-06 | 6a656fc | 14,590 B | A | view · diff |
| git:20260905.9dc1cd3 | 2026-09-05 | 9dc1cd3 | 14,587 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (4885 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
davidondrej/skills · 4,161 stars · license MIT · pushed 2026-10-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_uq3jyl2odut53ln4 GET https://markdownregistry.com/api/v1/resolve?ref=davidondrej/skills/cmux GET https://markdownregistry.com/api/v1/blob/57dae426aabc7bf7a1501996b41ef7bf192c9312ec53106eb40c08d9a7a1256c
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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