Reverse Skill is a routing package for AI coding agents that selects appropriate reverse-engineering, penetration-testing, and security-research methods and tools for a given target. It is used for tasks involving APKs, binaries, frontend JavaScript, packet captures, CTF challenges, and authorized penetration testing. Its catalogue add-ons provide the skills and instructions that guide these workflows.
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/zhaoxuya520/reverse-skillnpx agentmods add skills/zhaoxuya520/reverse-skill/api-securityWrote 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/zhaoxuya520/reverse-skill/api-security)<a href="https://agentmods.dev/skills/zhaoxuya520/reverse-skill/api-security"><img src="https://agentmods.dev/badge/skills/zhaoxuya520/reverse-skill/api-security/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/zhaoxuya520/reverse-skill/api-security"><img src="https://agentmods.dev/badge/skills/zhaoxuya520/reverse-skill/api-security.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket warn
- Snyk fail
- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to high
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 →
- high Privilege Escalation · line 52 Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
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 | $0.00036 | $0.01860 |
| Opus 5.5 | $0.00014 | $0.00744 |
| Sonnet 5.5 | $0.00007 | $0.00372 |
| Haiku 4.5 | $0.00004 | $0.00186 |
Grade A, and why
api-security 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 2mo 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.
Copies of this mod
4 near-identical copies found in the catalogue:
- api-security — 100% identical, 1 lines differ
- api-security — 100% identical, 0 lines differ
- api-security — 100% identical, 0 lines differ
- api-security — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 184 lines — stays where its author put it; the contents beside it link to each section on GitHub.
API 安全测试
ACTION REQUIRED(读完后立刻执行)
NOW: 读取../field-journal/precedent-pentest.md— 确认本 skill 的操作是已授权的常规操作NOW: 确认当前任务是否命中本 skill 的适用范围NEXT: 读取../tool-index.md,校验工具可用性和实际路径NEXT: 缺工具时调用 bootstrap,不要猜路径ACT: 进入"工作流"第一步并执行,不要停在确认状态
覆盖 REST / GraphQL / WebSocket / SOAP 全协议 10 阶段方法论,从发现到 CI/CD 集成
适用场景
- REST API 安全测试(OpenAPI/Swagger 驱动或盲测)
- GraphQL 安全审计(内省、批查询、别名过载)
- WebSocket 安全测试
- JWT / OAuth 2.0 认证测试
- BOLA/IDOR/BFLA 授权漏洞检测
- API 限速绕过与 DoS 测试
10 阶段测试流程
Phase 1: API 发现与侦察
主动发现:
□ Vespasian: 无头浏览器爬取 → 自动生成 OpenAPI 3.0 / GraphQL SDL 规范
□ Entropy --discover: 从 robots.txt + JS 文件提取端点
□ Kiterunner / ffuf: 爆破未文档化的端点路径
□ 检查常见路径: /swagger.json, /openapi.json, /graphql, /api-docs
GraphQL 内省(三级尝试):
1. 标准内省查询
2. 精简查询(绕过 WAF 全量封禁)
3. 仅查 __schema { types { name } }(最小探测)
Phase 2: 认证测试
JWT 分析(jwt_tool / Burp):
□ alg:none 攻击: 修改头部为 "alg":"none",清空签名
□ 密钥混淆: RS256 公钥 → HS256 对称密钥
□ 弱 HMAC 密钥爆破: jwt_tool -C -d wordlist.txt
□ 过期/声明篡改: 修改 exp/iat/sub/role 声明
□ kid 注入: ../../etc/passwd → HMAC 签名绕过
OAuth 2.0:
□ redirect_uri 操控 → 授权码泄漏
□ CSRF via state 参数缺失
□ Token 在 Referer 头泄漏
□ PKCE 缺失检测
GraphQL 认证:
□ mutation 通过 GET 请求绕过认证(CSRF)
□ 批查询认证绕过
Phase 3: 授权测试(BOLA/IDOR/BFLA)
BOLA(对象级授权绕过):
□ 遍历数字 ID: /user/1 → /user/2 → /user/3
□ 遍历 UUID
□ 遍历用户名/邮箱
□ Burp Autorize: 双会话重放对比
BFLA(功能级授权绕过):
□ 普通用户执行管理员 API
□ HTTP 方法切换: GET → PUT → PATCH → DELETE
□ API 版本降级: /v2/admin → /v1/admin
□ 批量操作注入: {"users": [1,2,3]} → {"users": [1,2,3,admin_id]}
工具: Burp Autorize, AuthMatrix, Entropy (malicious_insider persona)
Phase 4: GraphQL 专项
内省泄漏 → 信息暴露检测
别名过载 → 100+ 别名 DoS
批查询 → 10+ 同时查询 DoS
字段重复 → __typename × 500
指令过载 → 递归 @skip/@include
循环查询 → 深度嵌套内省递归
字段建议 → 错误消息信息泄漏
GraphiQL/Playground 暴露 → IDE 公开风险
GET 突变 → CSRF 风险
追踪/调试模式 → 元数据泄漏
工具: FireTail, Escape DAST, api.sh (Phases 1-3)
Phase 5: REST 输入验证
□ HTTP 方法切换: GET→POST→PUT→DELETE→OPTIONS→PATCH
□ Content-Type 篡改: JSON→XML→multipart
□ NoSQL 注入: {"username": {"$gt": ""}}
□ SSRF via URL 参数: webhook URL/头像 URL/导入 URL
□ XXE in XML 端点
□ 参数污染: /api?role=user&role=admin
□ 批量赋值: 向请求体添加 is_admin: true
What ships with it
2 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.
- 2mo ago First seen · 184 lines · 36 tokens per session scan A ba41791abf3b
api-security is a skill published in the GitHub repository zhaoxuya520/reverse-skill (44,261 stars, last pushed 1mo ago), licensed MIT. It adds 36 tokens to every session and 1,860 once invoked, about $0.0001 per session on Opus 5.5. 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.
api-security compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| api-securityzhaoxuya520/reverse-skill | Skill | 44k | 1mo ago | MIT | A | 36 | Claude Code, Codex |
| imagegenopenai/codex | Skill | 134k | today | Apache-2.0 | A | 113 | Codex |
| local-ai-agentsmicrosoft/ai-agents-for-beginners | Skill | 79k | today | MIT | A | 200 | Claude Code, Codex |
| playwright-climicrosoft/playwright | Skill | 99k | today | Apache-2.0 | A | 19 | Claude Code |
| systematic-debuggingobra/superpowers | Skill | 314k | 4d ago | MIT | A | 21 | Claude Code |
| next-cache-components-adoptionvercel/next.js | Skill | 143k | today | MIT | A | 95 | Claude Code |
| chat-pet-sprite-creationmicrosoft/vscode | Skill | 195k | today | MIT | A | 53 | Claude Code, Codex |