SAST Skills is a collection of agent workflows that inspect web and mobile application code for security vulnerabilities, where SAST means static application security testing. Developers and security reviewers use it to map a codebase, verify possible flaws, and produce a severity-ranked remediation report. The catalogue entries are the project's vulnerability-detection and reporting skills.
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 utkusen/sast-skills --skill sast-businesslogicgit clone --depth 1 https://github.com/utkusen/sast-skillsWrote 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/utkusen/sast-skills/sast-businesslogic)<a href="https://agentmods.dev/skills/utkusen/sast-skills/sast-businesslogic"><img src="https://agentmods.dev/badge/skills/utkusen/sast-skills/sast-businesslogic/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/utkusen/sast-skills/sast-businesslogic"><img src="https://agentmods.dev/badge/skills/utkusen/sast-skills/sast-businesslogic.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 | $0.00110 | $0.04713 |
| Opus 5 | $0.00055 | $0.02357 |
| Sonnet 5 | $0.00022 | $0.00943 |
| Haiku 4.5 | $0.00011 | $0.00471 |
Grade A, and why
sast-businesslogic 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 13d 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.
> [Step-by-step instructions or curl commands to confirm the finding on the live app. How it starts
The opening of the file, as written. The whole thing — 377 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Business Logic Vulnerability Detection
You are performing a focused security assessment to find business logic vulnerabilities in a codebase. This skill uses a three-phase approach with subagents: threat modeling (understand the domain and generate attack scenarios), batched verify (check whether scenarios are exploitable in parallel batches of 3), and merge (consolidate batch results).
Prerequisites: sast/architecture.md must exist. Run the analysis skill first if it doesn't.
What are Business Logic Vulnerabilities
Business logic vulnerabilities arise when an application's intended workflow, rules, or constraints can be manipulated to produce unintended outcomes — without exploiting technical flaws like injection or memory corruption. The attacker operates within the application's own features but uses them in ways the developers did not anticipate.
The core pattern: the application accepts input that is syntactically valid and passes authentication/authorization, but violates a business rule that was never enforced in code.
What Business Logic Vulnerabilities ARE
- Submitting a negative quantity to a purchase endpoint, receiving a credit instead of a charge
- Applying the same one-time discount coupon multiple times in parallel requests
- Skipping the payment step in a multi-step checkout by replaying a later step's request
- Posting a rating of 9999 to a movie rating endpoint that should cap ratings at 5
- Transferring a negative amount to move money from the recipient to the sender
- Redeeming a referral bonus by referring yourself with a second account
- Re-using a single-use reset token or voucher that was never invalidated
- Purchasing an item that is out of stock due to a race condition between inventory check and reservation
- Accessing a premium subscription feature after downgrading to a free plan
- Winning an auction by retracting a high bid after others have been eliminated
What Business Logic Vulnerabilities are NOT
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.
- 13d ago First seen · 377 lines · 110 tokens per session scan A a23b28dc1b72
sast-businesslogic is a skill published in the GitHub repository utkusen/sast-skills (1,309 stars, last pushed 5mo ago), licensed MIT. It adds 110 tokens to every session and 4,713 once invoked, about $0.0006 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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