oh-my-design: Skill for Claude Code

.claude/skills/omd-lab-02-design-harness/SKILL.md

omd-lab-02-design-harness is a skill for Claude Code from kwakseongjae/oh-my-design. It costs 13 tokens per session (1,468 once invoked), scanned A, original, MIT.

An experiment setup for comparing different configurations of a design-testing process. Each version changes a defined part of the setup, such as prompts, evaluator rules, or asset policies, and records the results.

In plain words
What is it for?
Use it to define test versions, run the same design task under each version, compare outputs and measurements, and collect lessons in postmortems.
Why use it?
It helps determine which process settings affect design quality, cost, and failure patterns instead of relying on assumptions.

Skill for Claude Code

Written for Claude Code: installed under .claude/. Also seen: reads .claude/ paths; mentions subagents.

This is kwakseongjae/oh-my-design's own configuration. It tells Claude Code how to work on oh-my-design itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything oh-my-design configures →

Reuse

Borrowing it

Nothing to install: this file belongs to kwakseongjae/oh-my-design. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/kwakseongjae/oh-my-design/main/.claude/skills/omd-lab-02-design-harness/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/kwakseongjae/oh-my-design

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for omd-lab-02-design-harness

README.md
[![agentmods](https://agentmods.dev/badge/skills/kwakseongjae/oh-my-design/omd-lab-02-design-harness/github.svg)](https://agentmods.dev/skills/kwakseongjae/oh-my-design/omd-lab-02-design-harness)
Your own site
<a href="https://agentmods.dev/skills/kwakseongjae/oh-my-design/omd-lab-02-design-harness"><img src="https://agentmods.dev/badge/skills/kwakseongjae/oh-my-design/omd-lab-02-design-harness/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for omd-lab-02-design-harness

Your own site · 80×15
<a href="https://agentmods.dev/skills/kwakseongjae/oh-my-design/omd-lab-02-design-harness"><img src="https://agentmods.dev/badge/skills/kwakseongjae/oh-my-design/omd-lab-02-design-harness.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 13 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,468 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00013 $0.01468
Opus 5 $0.00006 $0.00734
Sonnet 5 $0.00003 $0.00294
Haiku 4.5 $0.00001 $0.00147

Measured 12d ago against content hash 1cd1f062a6b5, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

omd-lab-02-design-harness scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 12d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/skills/omd-lab-02-design-harness/SKILL.md · 132 lines

How it starts

The opening of the file, as written. The whole thing — 132 lines — stays where its author put it; the contents beside it link to each section on GitHub.

OmD Lab #02 — Design Harness Refinement

omd:harness의 정교화 작업을 위한 실험실. 동일한 design task를 서로 다른 하네스 설정 (v1, v2, v3, ...)으로 돌려서 품질·비용·실패모드를 비교한다.

Lab #01이 "DESIGN.md 유무"의 영향을 봤다면, Lab #02는 하네스 자체의 설정(prompt 변형, persona pool, eval rubric, asset 정책 등)이 산출물에 미치는 영향을 본다.

디렉토리 구조

skills/omd-lab-02-design-harness/
├── SKILL.md                       (this file)
├── playbooks/
│   ├── v1.md                      (현재 baseline — first full implementation)
│   ├── v2.md                      (다음 실험 가설)
│   └── ...
├── runs/
│   ├── v1-run-<ts>-<slug>/        ← omd:harness가 v1 설정으로 돌린 산출물 전체
│   ├── v2-run-<ts>-<slug>/
│   └── ...
├── compare/
│   ├── README.md                  (어떤 task로 어떤 v를 비교했는가)
│   └── <task-id>/
│       ├── index.html             (v1 vs v2 vs v3 동시 비교 뷰)
│       └── metrics.json           (집계 비교 지표)
└── postmortem-aggregate.md        (전 v 누적 학습)

Lab Run 프로토콜

새 v 정의 (Lab 운영자 — 사용자 또는 Claude)

  1. playbooks/v<N>.md 작성. 가설을 한 줄로:
    ## Hypothesis
    v2 raises persona ABANDON budget from 3s → 5s, expecting fewer false-abandon and more useful friction signal.
    
  2. v이 v과 바꾸는 것 정확히 명시. 1개 변수만 바꾸는 게 원칙.
  3. 변경 점이 sub-agent 프롬프트에 있으면 playbooks/v<N>/agents-overrides/*.md로 patch 보관.

Lab Run 실행

# 운영자가 수동 실행
omd harness "<task>" --lab v2
# 또는 사용자가 자연어:
# "이 task를 lab v2 설정으로도 돌려서 v1과 비교해줘"

--lab v<N>이 들어오면:

  • runs/v<N>-run-<ts>-<slug>/ 디렉토리에 산출물 적재
  • v의 agent overrides가 있으면 그걸 임시로 .claude/agents/에 덮어씌운 채 실행 (run 종료 시 원복)
  • run.log에 lab_version: v<N> 기록

비교 뷰 생성

운영자가 동일 task에 대해 v1, v2, ..., vN의 run을 끝내면:

omd lab compare --task "<task-slug>" --versions v1,v2,v3

이게 compare/<task-slug>/index.html을 만든다. 4-패널 (또는 N-패널) 비교:

  • 각 v의 brief.md / 주요 wireframe / DESIGN.md.patch / persona ABANDON 요약 / 토큰 비용
  • 공통 metrics.json: per-v {iterations, total_tokens, persona_abandon_rate, deterministic_pass_rate, jury_score, time_to_handoff}

Read the full file on GitHub · 132 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 12d ago First seen · 132 lines · 13 tokens per session scan A 1cd1f062a6b5

Subscribe to this mod's changes

omd-lab-02-design-harness is a skill published in the GitHub repository kwakseongjae/oh-my-design (500 stars, last pushed 5d ago), licensed MIT. It adds 13 tokens to every session and 1,468 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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