hunting-business-logic-flaws SKILL.md skillA
hunting-business-logic-flaws from unboundcompute/security-agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add unboundcompute/security-agent-skills/hunting-business-logic-flaws@git:20260816.a6124f2Pins git:20260816.a6124f2 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- unboundcompute/security-agent-skills
- Path
skills/hunting-business-logic-flaws/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260816.a6124f2, committed Aug 16, 2026
- Size
- 6,942 bytes
- Repository stars
- 26
- License
- MIT
Hunt for vulnerabilities that live in what an application is allowed to do, not in how it is coded: workflow steps that can be skipped or reordered, quantity/price/limit values that go negative or overflow a cap, state transitions that should be unreachable, replay and concurrency abuse, and privileged outcomes reached through a sequence of individually-valid requests. Use when reviewing checkout, transfers, redemption, quotas, or any rule the code enforces implicitly. These are the flaws…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Hunting business-logic flaws: the bugs where every request is valid A business-logic flaw is a gap between what the code enforces and what the business intends. No request is malformed, no payload is injected, no signature is invalid; the attacker just does allowed things in a disallowed order, quantity, or combination. Scanners cannot find these, because there is no dangerous function call to flag. The danger is the sequence and the arithmetic, so finding them means modeling the intended rule first, then searching for a permitted path that breaks it. ## When to use - You are reviewing checkout, payment, transfers, refunds, or redemption. - A multi-step flow with a required order (signup, approval, provisioning). - Anything with a quota, a limit, a balance, a tier, or a one-time action. ## Scope check Test flows you own or are authorized to test. Exercise sequences against your own accounts and data; do not move real money or affect real users. If you can't name the authorization, stop. ## The loop 1. **Recover the intended rules.** For the flow under review, write down the invariants the business assumes: "a coupon applies once," "you cannot ship what …
Read the whole file at its exact version.
How to install
mdr add unboundcompute/security-agent-skills/hunting-business-logic-flaws@sha256:6ff81db2ab91657dThe line at the top of this page pins the label git:20260816.a6124f2, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_jqeyduyxogf647nb)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Aug 16, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (6942 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
unboundcompute/security-agent-skills · 26 stars · license MIT · pushed 2026-09-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_jqeyduyxogf647nb GET https://markdownregistry.com/api/v1/resolve?ref=unboundcompute/security-agent-skills/hunting-business-logic-flaws GET https://markdownregistry.com/api/v1/blob/6ff81db2ab91657d7bf808aea132c23de517d713dd3dc5b4ab1cd137b3cec5ae
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.