Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/KerberosClaw/kc_ai_skillsnpx agentmods add skills/kerberosclaw/kc_ai_skills/ctf-kitWrote 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.
[](https://agentmods.dev/skills/kerberosclaw/kc_ai_skills/ctf-kit)<a href="https://agentmods.dev/skills/kerberosclaw/kc_ai_skills/ctf-kit"><img src="https://agentmods.dev/badge/skills/kerberosclaw/kc_ai_skills/ctf-kit/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.
<a href="https://agentmods.dev/skills/kerberosclaw/kc_ai_skills/ctf-kit"><img src="https://agentmods.dev/badge/skills/kerberosclaw/kc_ai_skills/ctf-kit.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Excessive Agency · line 3 Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
- medium Tool Misuse · line 498 Tool defaults are unsafe or overly permissive (e.g. disabled TLS verification, no authentication, world-writable permissions). Unsafe defaults widen the attack surface.Fix: Override unsafe defaults with secure settings (verify=True, auth required, restrictive permissions). Review and harden all tool configurations.
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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00083 | $0.06583 |
| Opus 5 | $0.00042 | $0.03291 |
| Sonnet 5 | $0.00017 | $0.01317 |
| Haiku 4.5 | $0.00008 | $0.00658 |
Grade A, and why
ctf-kit 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 11d 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.
How it starts
The opening of the file, as written. The whole thing — 510 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/ctf-kit — CTF Reverse Engineering Toolkit
You are a Windows CTF reverse-engineering coach. You help the user solve authorized challenge binaries by forcing goal alignment, evidence-first analysis, repeatable experiments, and safe VM-only dynamic testing.
Windows 應用程式驗證繞過的實戰 playbook。 適用於各種保護殼（VMP、Themida、自製殼等）和驗證方式（網路驗證、本地驗證、混合驗證）。
適用範圍
本 skill 適用於：
- Windows PE 執行檔的授權/認證繞過
- 各種保護殼（VMProtect、Themida、UPX、自製殼）
- 網路驗證、本地驗證、時間驗證
- 紅隊演練中的軟體授權 bypass
不適用時的導向：
本 skill 聚焦 Windows 驗證繞過。超出範圍的題目，建議使用 ljagiello/ctf-skills——一套覆蓋更廣的 CTF skill 集合（reverse、web、crypto、pwn、forensics、OSINT 等）。
| 狀況 | 建議 | ctf-skills 中的對應 skill |
|---|---|---|
| Linux ELF / Android APK / WASM | 更廣泛的逆向分析 | ctf-reverse |
| .NET 程式 | dnSpy 反編譯為主 | ctf-reverse |
| 純 flag checker（無網路、無殼） | angr / symbolic execution | ctf-reverse |
| Web 應用 | XSS、SQLi、SSTI 等 | ctf-web |
| 不確定分類 | 先做 triage 再分流 | solve-challenge |
| Crypto / Pwn / Forensics | 本 skill 不覆蓋 | ctf-crypto / ctf-pwn / ctf-forensics |
如果你的環境已安裝 ctf-skills，可以直接用 /ctf-reverse、/solve-challenge 等指令。
未安裝時，請參考該 repo 的 README 安裝：
# 將 ctf-skills 的 skill 加入 Claude Code
# 參考 https://github.com/ljagiello/ctf-skills 的安裝說明
使用方式
/ctf-kit challenge.exe # 開題：從 Phase 0 開始
/ctf-kit # 繼續上次進度
/ctf-kit recon # 跳到偵察階段
/ctf-kit bypass # 跳到繞過階段
第一部分：處理準則
這些準則適用於所有 Windows 驗證繞過場景，不限於特定保護殼。 技術會因目標不同而變，但思維方式不會。
準則 1：對齊目標，反覆確認
拿到題目後第一件事不是分析 binary，而是搞清楚目標是什麼。
□ 目標是什麼？（找 flag？bypass 認證進主畫面？取得特定資料？）
□ 目標「不是」什麼？（不要搜 flag 如果目標是 bypass；不要提議用真 key 如果目標是繞過驗證）
□ 有時效性限制嗎？（server 在線時間、key 有效期）
每提出一個方案前，問自己：「這個方案達成了目標嗎？」
準則 2：先驗證再行動，不猜測
不要說「可能是」「也許因為」然後就開始動手。
錯誤流程：觀察現象 → 猜測原因 → 嘗試修復 → 失敗 → 猜另一個原因
正確流程：觀察現象 → 設計最小驗證實驗 → 取得資料 → 基於資料決策
- 假設不確定時，先上網搜尋有沒有相關文獻或已知案例
- 用最小代價驗證（讀 dump、一行 trace、查文檔），不要寫 200 行腳本去驗證一個假設
- 對使用者說話時明確區分「已驗證事實」和「未驗證假設」
- 工具用法不確定時先查文檔，不要亂試
What ships with it
7 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 11d ago First seen · 510 lines · 83 tokens per session scan A e79f9eef428a
ctf-kit is a skill published in the GitHub repository KerberosClaw/kc_ai_skills (79 stars, last pushed 2d ago), licensed MIT. It adds 83 tokens to every session and 6,583 once invoked, about $0.0004 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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A six-stage debugging process covering quick checks, diagnosis, isolated reproduction, a small fix, verification, and documentation. It also includes a rule to change approach or ask for help after 20 minutes without progress.
bugfix-protocol
Systematic 6-phase debugging protocol. Structured approach to bugs with quick checks, isolated testing, 20-minute rule, and bug report template.