Harness Verification

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

Category: Content · Sub-category: content-misc · Last updated: 2026-07-21

xp-harness の skill / subagent が意図どおり振る舞えているか (発火するか・あるべき振る舞いができているか) を transcript で事実確認する手順。skill / subagent を改修した後に sandbox で動作検証したいとき、または本番の実運用セッションを「あるべき振る舞い」に照らして分析したいとき、「検証したい」「発火するか確かめたい」「このセッションを分析したい」と言われたときに発火させる。核は発火・振る舞いができたかの事実確認で、本番セッションでは自走の良し悪し (止まり方・判断の質など) も見る。

Security AStatic scan found no risk patternsHow grading works ›

What this skill does

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

Who uses this skill

The Harness Verification Claude Code skill is built for content creators, marketers, copywriters, SEO professionals, and editorial teams. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 213,000+ 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-verification
curl -L https://claudskills.com/skills/harness-verification/SKILL.md \
  -o ~/.claude/skills/harness-verification/SKILL.md

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

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

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

What does the Harness Verification 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 Harness Verification skill?

Use Harness Verification when your Claude Code task falls under the Content category — specifically in the content 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 Verification" or describe the task and let Claude pick). Browse related skills at /category/content/.

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

Attribution & license

Source: https://github.com/sei-newbear/xp-harness/blob/1b6b300611f7fc2a6453b9d4542dce5e86026af4/.claude/skills/harness-verification/SKILL.md
License: MIT
Author: sei-newbear

Cite this skill

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

APA

sei-newbear. (2026). Harness Verification [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/harness-verification/

BibTeX

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

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

Security scan

Grade A · scanned 2026-11-01 — 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-verification/#security)