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.
npx skills add woohyun212/security-skill --skill web-vuln-business-logicgit clone --depth 1 https://github.com/woohyun212/security-skillWrote 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/woohyun212/security-skill/web-vuln-business-logic)<a href="https://agentmods.dev/skills/woohyun212/security-skill/web-vuln-business-logic"><img src="https://agentmods.dev/badge/skills/woohyun212/security-skill/web-vuln-business-logic/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/woohyun212/security-skill/web-vuln-business-logic"><img src="https://agentmods.dev/badge/skills/woohyun212/security-skill/web-vuln-business-logic.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00032 | $0.04527 |
| Opus 5 | $0.00016 | $0.02263 |
| Sonnet 5 | $0.00006 | $0.00905 |
| Haiku 4.5 | $0.00003 | $0.00453 |
Grade A, and why
web-vuln-business-logic scanned grade A with 1 finding 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
Detects business logic vulnerabilities by mapping application workflows, identifying state transitions, and testing each for skip/replay/manipulation attacks. Covers six categories: workflow step bypass, negative quantit How it starts
The opening of the file, as written. The whole thing — 351 lines — stays where its author put it; the contents beside it link to each section on GitHub.
What this skill does
Detects business logic vulnerabilities by mapping application workflows, identifying state transitions, and testing each for skip/replay/manipulation attacks. Covers six categories: workflow step bypass, negative quantity and price manipulation, coupon and discount abuse, rate limit bypass via racing, feature flag abuse, and time-of-check-time-of-use (TOCTOU) race conditions. Uses manual testing with curl and Burp Suite — no specialized vulnerability scanner applies to this class.
When to use
- When testing any feature involving money, credits, discounts, or refunds
- When an application has a multi-step workflow (checkout, registration, password reset, subscription upgrade)
- When a request body contains a price, quantity, amount, or discount field
- When a coupon or promo code endpoint exists
- When a feature is gated behind a role, plan, or subscription level
- When testing actions that check a value and then act on it (balance checks, ownership checks, quota limits)
Prerequisites
- A valid test account with access to the feature being tested (use a free or test account)
- A proxy tool (Burp Suite or Caido) to intercept and modify requests
- Two accounts for race condition testing (or two browser sessions)
- For coupon testing: at least one valid coupon code (use a legitimately obtained code)
- Authorization under a valid bug bounty or pentest scope
Inputs
| Variable | Required | Description |
|---|---|---|
SECSKILL_TARGET |
Yes | Base URL of the target (e.g., https://app.example.com) |
SECSKILL_TOKEN |
Yes | Bearer token or session cookie for the test account |
SECSKILL_WORKFLOW_START |
Yes | First endpoint in the workflow (e.g., /checkout/start) |
SECSKILL_WORKFLOW_END |
Yes | Final endpoint in the workflow (e.g., /checkout/confirm) |
SECSKILL_COUPON_CODE |
Optional | A valid coupon code to test for replay/stacking abuse |
SECSKILL_ITEM_ID |
Optional | Product or item ID to use in cart/price manipulation tests |
SECSKILL_OUTPUT_DIR |
Optional | Directory to save results (default: ./output) |
What ships with it
1 file 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.
- 12d ago First seen · 351 lines · 32 tokens per session scan A 87d75d5051bd
web-vuln-business-logic is a skill published in the GitHub repository woohyun212/security-skill (21 stars, last pushed 4mo ago), licensed MIT. It adds 32 tokens to every session and 4,527 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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