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 jd-opensource/JoySafeter --skill pentest-business-logicgit clone --depth 1 https://github.com/jd-opensource/JoySafeterWrote 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/jd-opensource/joysafeter/pentest-business-logic)<a href="https://agentmods.dev/skills/jd-opensource/joysafeter/pentest-business-logic"><img src="https://agentmods.dev/badge/skills/jd-opensource/joysafeter/pentest-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/jd-opensource/joysafeter/pentest-business-logic"><img src="https://agentmods.dev/badge/skills/jd-opensource/joysafeter/pentest-business-logic.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00034 | $0.00836 |
| Opus 5 | $0.00017 | $0.00418 |
| Sonnet 5 | $0.00007 | $0.00167 |
| Haiku 4.5 | $0.00003 | $0.00084 |
Grade A, and why
pentest-business-logic 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 — 62 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Pentest Business Logic
Purpose
Identify flaws in application workflow enforcement, business rule validation, and state machine integrity that cannot be found by taint analysis or pattern matching. These vulnerabilities require understanding intended behavior and finding deviations.
Prerequisites
Authorization Requirements
- Written authorization with explicit scope for business logic testing
- Test accounts at multiple privilege levels (user, admin, premium, etc.)
- Test payment methods or sandbox payment environment for financial testing
- Rollback plan for any data-mutating tests (order creation, account changes)
Environment Setup
- Burp Suite Professional with Repeater/Intruder configured
- Playwright or Selenium for multi-step browser automation
- Proxy configured to capture all application traffic
- Test data seeded for workflow testing (products, coupons, user accounts)
Core Workflow
- Workflow Mapping: Extract multi-step flows (checkout, registration, approval chains, onboarding) from recon deliverables and source code. Document expected state transitions and business constraints.
- Rule Extraction: Identify server-side business constraints — price validation, quantity limits, role-gated actions, time-based restrictions, coupon rules, referral limits.
- Step Circumvention: Skip, replay, reorder steps in multi-step workflows. Access final-step endpoints directly without completing prerequisites (WSTG-BUSL-06).
- Data Integrity Abuse: Submit negative quantities, zero-price items, boundary values, type confusion in business fields. Test forged request parameters (WSTG-BUSL-02/03).
- Function Limit Bypass: Test coupon reuse, referral loops, vote stuffing, resource exhaustion through legitimate endpoints (WSTG-BUSL-05).
- File Upload Logic: Upload unexpected file types, oversized files, polyglot files, content-type mismatch, path traversal in filenames (WSTG-BUSL-08/09).
- Payment Testing: Price manipulation at each checkout stage, currency confusion, discount stacking, partial payment abuse (WSTG-BUSL-10).
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.
- 11d ago First seen · 62 lines · 34 tokens per session scan A 0ee9267b4d02
pentest-business-logic is a skill published in the GitHub repository jd-opensource/JoySafeter (307 stars, last pushed yesterday), licensed Apache-2.0. It adds 34 tokens to every session and 836 once invoked, about $0.0002 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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