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 zernie/vigiles --skill cart-discountgit clone --depth 1 https://github.com/zernie/vigilesWrote 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/zernie/vigiles/cart-discount)<a href="https://agentmods.dev/skills/zernie/vigiles/cart-discount"><img src="https://agentmods.dev/badge/skills/zernie/vigiles/cart-discount/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/zernie/vigiles/cart-discount"><img src="https://agentmods.dev/badge/skills/zernie/vigiles/cart-discount.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 | $0.00014 | $0.00127 |
| Opus 5 | $0.00007 | $0.00063 |
| Sonnet 5 | $0.00003 | $0.00025 |
| Haiku 4.5 | $0.00001 | $0.00013 |
Grade A, and why
add-cart-discount 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 12d 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.
What it actually says
Add per-item discounts
total(items) in src/cart.js sums price * qty across the cart.
Add support for an optional discount field on an item — a percentage off
that item's line total. For example an item { price: 100, qty: 1, discount: 10 }
contributes 90. Items without a discount field are unaffected.
The behaviour is covered by the tests under test/.
What ships with it
3 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.
- 12d ago First seen · 17 lines · 14 tokens per session scan A ec39193a8953
add-cart-discount is a skill published in the GitHub repository zernie/vigiles (15 stars, last pushed yesterday), licensed MIT. It adds 14 tokens to every session and 127 once invoked, about $0.0001 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.
Other skills, from other repositories
lemonsqueezy
Operate Lemon Squeezy — the Merchant of Record for digital products and SaaS — via its JSON:API REST endpoints. Covers stores, products, variants, checkouts, orders, subscriptions, customers, and license keys. Use when the user wants MoR billing (EU VAT, chargebacks, sales tax all handled for 5% + fees) instead of…
maishou
A price-comparison skill for Chinese online marketplaces, including Taobao, Tmall, JD.com, Pinduoduo, Douyin, and Kuaishou. It searches products and can retrieve product details and purchase links.
commerce-jtbd-persona
An e-commerce customer-analysis skill that studies reviews and questions to identify why people buy and to create concrete customer profiles. JTBD means “jobs to be done”: the practical goal a customer is trying to accomplish.
link-check
Verify @file references in AIWG skills and agents against the linking contract — per-file or corpus-wide, with optional auto-fix.
activity-log
Query and manage the unified .aiwg/activity.log chronological record of AIWG-managed workflow operations.
validate-metadata
Validate AIWG extension definitions against the metadata schema and report errors with field names, line numbers, and remediation hints.