Harness Mode

Q: What is a Claude Code skill and how does the Harness Mode 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. Harness Mode is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: General · Sub-category: general-misc · Last updated: 2026-07-21

type:review

Use when the user explicitly asks for "하네스 모드", "하네스로 하자", "harness mode", role-separated development, CEO/CTO/implementer/verifier/reviewer separation, or gated implementation.

Security AStatic scan found no risk patternsHow grading works ›

From the source SKILL.md

Harness by Moo is an opt-in development harness for Codex. Use this skill only when the user explicitly asks for harness mode, for example 하네스로 하자, 하네스 모드로 진행해, or harness mode. Do not apply it to ordinary requests.

What this skill does

Harness Mode is a community-contributed Claude Code skill in the general-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/harness-mode/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when the user explicitly asks for "하네스 모드", "하네스로 하자", "harness mode", role-separated development, CEO/CTO/implementer/verifier/reviewer separation, or gated implementation.

Who uses this skill

The Harness Mode Claude Code skill is built for Claude Code users and developers across all disciplines looking for general-purpose AI assistance. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 196,000+ 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/harness-mode
curl -L https://claudskills.com/skills/harness-mode/SKILL.md \
  -o ~/.claude/skills/harness-mode/SKILL.md

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

Skills live at ~/.claude/skills/harness-mode/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\harness-mode\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 Harness Mode Claude Code skill?

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

What does the Harness Mode skill do?

Use when the user explicitly asks for "하네스 모드", "하네스로 하자", "harness mode", role-separated development, CEO/CTO/implementer/verifier/reviewer separation, or gated implementation.

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 Harness Mode skill?

Use Harness Mode when your Claude Code task falls under the General category — specifically in the general misc 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 Harness Mode" or describe the task and let Claude pick). Browse related skills at /category/general/.

What is a Claude Code skill and how does the Harness Mode 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. Harness Mode is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the General category. Learn more at /learn/what-is-a-claude-skill/.

Attribution & license

Source: https://github.com/MuchanKim/dotfiles/blob/HEAD/plugins/codex-harness/skills/harness-mode/SKILL.md
Author: MuchanKim

Cite this skill

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

APA

MuchanKim. (2026). Harness Mode [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/harness-mode/

BibTeX

@misc{harness-mode-2026,
  author    = {MuchanKim},
  title     = {Harness Mode [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/harness-mode/}
}

Embed this skill

Promote, attribute, or link this skill from your own README, blog post, or documentation. All three snippets are free to use — no sign-up, no API key. More distribution surfaces →

Badge

[![ClaudSkills](https://claudskills.com/badge/harness-mode.svg)](https://claudskills.com/skills/harness-mode/?utm_source=badge&utm_medium=readme&utm_campaign=skill_badge)

Security scan

Grade A · scanned 2026-09-28 — 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/harness-mode/#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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