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 SecurityTalent/bugskill-ai --skill business-logic-flawsgit clone --depth 1 https://github.com/SecurityTalent/bugskill-aiWrote 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/securitytalent/bugskill-ai/business-logic-flaws)<a href="https://agentmods.dev/skills/securitytalent/bugskill-ai/business-logic-flaws"><img src="https://agentmods.dev/badge/skills/securitytalent/bugskill-ai/business-logic-flaws/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/securitytalent/bugskill-ai/business-logic-flaws"><img src="https://agentmods.dev/badge/skills/securitytalent/bugskill-ai/business-logic-flaws.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 | $0.00098 | $0.01869 |
| Opus 5.5 | $0.00039 | $0.00748 |
| Sonnet 5.5 | $0.00020 | $0.00374 |
| Haiku 4.5 | $0.00010 | $0.00187 |
Grade A, and why
business-logic-flaws 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 20d 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.
curl -s -b "session=TOKEN" TARGET/orders/1001 This is a copy
100% identical to business-logic-flaws — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 157 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Business Logic Flaws
What Is Broken and Why
Business logic flaws occur when an application's security controls are implemented only on the client side, or when developers assume users will always follow the intended workflow. Unlike injection attacks, these vulnerabilities use the application's own features correctly from a technical standpoint but in unintended sequences or with unexpected values. They are particularly dangerous because automated scanners rarely detect them — they require understanding the application's intended purpose. Common manifestations include price/quantity manipulation, workflow step bypass, coupon reuse, race conditions in financial operations, and privilege escalation via hidden or predictable parameters.
Key Signals
- Hidden form fields containing prices, discount amounts, user roles, or IDs
- Multi-step purchase/checkout workflows where steps can be skipped via direct URL navigation
- Coupon or discount codes accepted multiple times
- Pricing or quantity fields not validated server-side (only validated in JavaScript)
- Parameters incrementing predictably (orderId=1001, 1002…) suggesting enumerable resources
- Time-sensitive operations (balance checks, reservation holds) that can be exploited between check and action
- Admin or privilege flags passed in HTTP parameters
- Audit log endpoints with insufficient access controls
Methodology
-
Data Validation Testing (BUSL-01)
- Identify all data entry and handoff points between system components
- Intercept HTTP requests and submit logically invalid values: negative quantities, non-existent IDs, out-of-range prices
- Verify server rejects logically invalid data (not just client-side validation)
-
Request Forging (BUSL-02)
- Monitor POST/GET for guessable or predictable parameter values
- Identify hidden features (debug flags, admin toggles) in HTTP parameters
- Modify discovered values to test for unintended access or behavior
-
Integrity Check Testing (BUSL-03)
- Compare hidden HTTP fields against visible GUI fields
- Submit alternative values in "read-only" fields via proxy
- Test log file and audit trail manipulation via unauthorized access
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.
- 20d ago First seen · 157 lines · 98 tokens per session scan A 7dc77441a3b4
business-logic-flaws is a skill published in the GitHub repository SecurityTalent/bugskill-ai (13 stars, last pushed 21d ago), licensed MIT. It adds 98 tokens to every session and 1,869 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). It is 100% identical to business-logic-flaws, differing in 0 lines, and is treated as a copy.
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