antipattern-detector

antipattern-detector is an agent for Claude Code from revfactory/harness-engineering-with-cc. It costs 69 tokens per session (377 once invoked), scanned A, original, Apache-2.0.

A checker for one SKILL.md file, which is a written instruction file for an agent skill. It looks for three stated anti-patterns: an overly large document, missing reference material, and rules without explanations.

In plain words
What is it for?
Use it to inspect a skill's instruction file and receive a low, medium, or high severity assessment with recommendations.
Why use it?
It points out structural problems that can make a skill harder to maintain or understand. It reports whether each problem appears, its severity, supporting counts, and a suggested fix.

Agent for Claude Code

Written for Claude Code: installed under .claude/. Also seen: model in frontmatter.

Good fit Use it to inspect a skill's instruction file and receive a low, medium, or high severity assessment with recommendations.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/revfactory/harness-engineering-with-cc/antipattern-detector
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/revfactory/harness-engineering-with-cc

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 antipattern-detector

README.md
[![agentmods](https://agentmods.dev/badge/agents/revfactory/harness-engineering-with-cc/antipattern-detector.svg)](https://agentmods.dev/agents/revfactory/harness-engineering-with-cc/antipattern-detector)
Your own site
<a href="https://agentmods.dev/agents/revfactory/harness-engineering-with-cc/antipattern-detector"><img src="https://agentmods.dev/badge/agents/revfactory/harness-engineering-with-cc/antipattern-detector.svg" alt="Measured on agentmods" height="20"></a>
Per session 69 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 377 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.
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 $0.00069 $0.00377
Opus 5 $0.00034 $0.00188
Sonnet 5 $0.00014 $0.00075
Haiku 4.5 $0.00007 $0.00038

Measured 8d ago against content hash d8c35a7a5890, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

antipattern-detector 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 8d 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.

ex-05-12-antipatterns/.claude/agents/antipattern-detector.md · 25 lines

What it actually says

antipattern-detector

SKILL.md 한 개를 받아 3안티패턴을 진단하고 심각도를 라벨링한다. (ex-05-05 skill-size-auditor의 확장형 — 안티패턴 3 Why-First 위반과 심각도 등급 추가.)

진단 룰

  1. 안티패턴 1 (거대 본문): wc -l >= 500이면 발현.
  2. 안티패턴 2 (references 부재): references/ 디렉토리 없음 + 본문 도메인 분기 키워드 >= 4면 발현.
  3. 안티패턴 3 (이유 없는 규칙): grep -c 'ALWAYS|NEVER|반드시|절대' >= 5 AND grep -c '왜냐하면|때문에' == 0이면 발현.

심각도 등급

  • high: 모든 신호 발현 + 즉시 분리 권고.
  • med: 1-2개 신호 + 곧 분리 필요.
  • low: 잠재 신호, 모니터링.

출력

안티패턴별 발현(yes/no) + 근거(수치) + 심각도 + 해결 권고.

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. 8d ago First seen · 25 lines · 69 tokens per session scan A d8c35a7a5890

Subscribe to this mod's changes

antipattern-detector is an agent published in the GitHub repository revfactory/harness-engineering-with-cc (104 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 69 tokens to every session and 377 once invoked, about $0.0003 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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