hunting-price-and-coupon-manipulation SKILL.md skillA
hunting-price-and-coupon-manipulation 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-price-and-coupon-manipulation@git:20260829.b60f9b2Pins git:20260829.b60f9b2 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-price-and-coupon-manipulation/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260829.b60f9b2, committed Aug 29, 2026
- Size
- 10,126 bytes
- Repository stars
- 26
- License
- MIT
Hunt for ways a buyer can control the price the server charges: a price, quantity, or line total taken from the client request instead of recomputed server-side from a trusted catalog, a negative or overflowing quantity that drives the total down or wraps it, a discount or coupon that stacks, reuses past its limit, or applies to items it should not, and a total computed on the client and trusted at checkout. Covers e-commerce carts, checkout totals, and promotion engines where the amount…
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 price and coupon manipulation: whoever computes the total decides what you pay The amount a customer is charged is computed from item prices, quantities, and discounts, and the only safe place to do that computation is the server, from data the buyer cannot change. When any input to the total is taken from the client, the buyer sets the price. The failures are direct. A price, quantity, or line total sent in the request and trusted, rather than recomputed from a server-side catalog, lets a buyer name their own price. A negative quantity subtracts from the total, and a quantity large enough to overflow the arithmetic wraps it to a small or negative number. A discount or coupon that stacks with itself or others, is reused past its intended limit, or applies to items it was never meant for, cuts the total below its floor. And a total computed in the browser and accepted at checkout hands the whole calculation to the attacker. The hunt is to find any input to the charged total that the buyer controls. You hunt this by altering prices, quantities, and coupons in the request and seeing what the server charges. ## When to use …
Read the whole file at its exact version.
How to install
mdr add unboundcompute/security-agent-skills/hunting-price-and-coupon-manipulation@sha256:9041ce596d3509dcThe line at the top of this page pins the label git:20260829.b60f9b2, 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_repe23foci577lrg)
2 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Aug 29, 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 (10126 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_repe23foci577lrg GET https://markdownregistry.com/api/v1/resolve?ref=unboundcompute/security-agent-skills/hunting-price-and-coupon-manipulation GET https://markdownregistry.com/api/v1/blob/9041ce596d3509dc393a3a1f526220f8d4c64749525f682e510047688582d00a
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.