Cmux Diagnostics

Q: What is a Claude Code skill and how does the Cmux Diagnostics skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Cmux Diagnostics is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Product category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Product · Sub-category: ux-research · Last updated: 2026-05-23

type:debug type:integration

Run end-user cmux diagnostics. Use when cmux hooks, notifications, session restore, settings, browser automation, socket access, CLI control, or agent resume behavior is not working, or when the user asks for a cmux health check, doctor report, or support-safe debug summary.

Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

Use this skill to collect and interpret support-safe cmux diagnostics for end users. Default to read-only checks. Do not dump hook config files, session stores, prompt logs, tokens, or environment secrets.

What this skill does

Cmux Diagnostics is a community-contributed Claude Code skill in the ux-research sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/cmux-diagnostics/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when cmux hooks, notifications, session restore, settings, browser automation, socket access, CLI control, or agent resume behavior is not working, or when the user asks for a cmux health check, doctor report, or support-safe debug summary.

Who uses this skill

The Cmux Diagnostics Claude Code skill is built for product managers, product designers, and cross-functional teams planning, shipping, and measuring product features. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 168,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/cmux-diagnostics
curl -L https://claudskills.com/skills/cmux-diagnostics/SKILL.md \
  -o ~/.claude/skills/cmux-diagnostics/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/cmux-diagnostics/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/cmux-diagnostics/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\cmux-diagnostics\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Cmux Diagnostics Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/cmux-diagnostics/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Cmux Diagnostics skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Cmux Diagnostics skill?

Use Cmux Diagnostics when your Claude Code task falls under the Product category — specifically in the ux research area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Cmux Diagnostics" or describe the task and let Claude pick). Browse related skills at /category/product/.

What is a Claude Code skill and how does the Cmux Diagnostics skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Cmux Diagnostics is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Product category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/manaflow-ai/cmux/blob/HEAD/skills/cmux-diagnostics/SKILL.md
Author: manaflow-ai
Website: https://cmux.com

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

manaflow-ai. (2026). Cmux Diagnostics [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/cmux-diagnostics/

BibTeX

@misc{cmux-diagnostics-2026,
  author    = {manaflow-ai},
  title     = {Cmux Diagnostics [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/cmux-diagnostics/}
}

Embed this skill

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Badge

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Security scan

Grade A · scanned 2026-07-31 — free static scan against the OWASP Agentic Skills Top 10.

No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›

✓ Prompt injection
✓ Data exfiltration
✓ Supply chain
✓ Reverse shell
✓ Credentials
✓ Execution
✓ Filesystem
✓ Persistence
✓ Obfuscation
✓ Network

Show this grade on your repo (click to copy):

[![Security: A](https://img.shields.io/badge/Security-A-2e7d32)](https://claudskills.com/skills/cmux-diagnostics/#security)

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Part of ClaudSkills — the open registry for Claude Skills & Claude Code Skills. · What's New · Install guide · About · llms.txt

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