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 finsilabs/awesome-ecommerce-skills --skill flash-sale-enginegit clone --depth 1 https://github.com/finsilabs/awesome-ecommerce-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/finsilabs/awesome-ecommerce-skills/flash-sale-engine)<a href="https://agentmods.dev/skills/finsilabs/awesome-ecommerce-skills/flash-sale-engine"><img src="https://agentmods.dev/badge/skills/finsilabs/awesome-ecommerce-skills/flash-sale-engine/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/finsilabs/awesome-ecommerce-skills/flash-sale-engine"><img src="https://agentmods.dev/badge/skills/finsilabs/awesome-ecommerce-skills/flash-sale-engine.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 | $0.00029 | $0.02426 |
| Opus 5 | $0.00015 | $0.01213 |
| Sonnet 5 | $0.00006 | $0.00485 |
| Haiku 4.5 | $0.00003 | $0.00243 |
Grade A, and why
flash-sale-engine 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 9d 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.
How it starts
The opening of the file, as written. The whole thing — 208 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Flash Sale Engine
Overview
Flash sales are time-limited discounts — typically 2–24 hours — that create urgency and drive conversion spikes. They require three things to work reliably: a countdown timer visible to shoppers, per-sale quantity limits that prevent overselling, and automatic price restoration when the sale ends. For high-traffic launches (product drops, Black Friday doorbusters), a virtual waiting room is also essential to prevent bot scalping. Most platforms have apps that handle this without custom code.
When to Use This Skill
- When launching time-limited sale events (e.g., 24-hour deals, Black Friday doorbusters) that must end at an exact time
- When a product has limited flash-sale quantity separate from the main inventory
- When expecting traffic spikes large enough to cause overselling with naive inventory checks
- When you need a waiting room or queue to fairly admit customers during high-demand drops
- When building a deals platform where multiple flash sales run simultaneously across different products
Core Instructions
Step 1: Determine the merchant's platform and choose the right tool
| Platform | Recommended Tool | Why |
|---|---|---|
| Shopify | Countdown Timer Bar, FOMO, or Hextom Flash Sales app | These apps handle countdown timers, scheduled price changes, and inventory display without custom code |
| Shopify Plus | Launchpad (free for Plus) | Shopify's official flash sale app — schedules price changes, enables/disables discount codes, and restores prices automatically |
| WooCommerce | YITH WooCommerce Flash Sales or WooCommerce Sales Countdown | Manage sale prices with countdown timers directly on product pages |
| BigCommerce | BigCommerce Promotions with custom script for countdown timer | BigCommerce's promotions engine handles discounts; use a storefront script for the timer UI |
| High-traffic drops (any platform) | Cloudflare Waiting Room | Cloudflare's managed waiting room queues visitors fairly; prevents scalper bots from monopolizing limited stock |
| Custom / Headless | Build with Redis for atomic stock and SSE/WebSocket for timer | Full control for custom platforms where apps don't apply |
What ships with it
7 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.
- evals/atomic-stock-reservation-with-redis/criteria.json 3.0 KB
- evals/atomic-stock-reservation-with-redis/task.md 1.8 KB
- evals/real-time-countdown-timer-via-sse/criteria.json 3.0 KB
- evals/real-time-countdown-timer-via-sse/task.md 1.8 KB
- evals/sale-scheduling-and-virtual-queue-manage/criteria.json 3.0 KB
- evals/sale-scheduling-and-virtual-queue-manage/task.md 1.8 KB
- tile.json 232 B
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.
- 9d ago First seen · 208 lines · 29 tokens per session scan A ab550ef6fae1
flash-sale-engine is a skill published in the GitHub repository finsilabs/awesome-ecommerce-skills (52 stars, last pushed 6mo ago), licensed MIT. It adds 29 tokens to every session and 2,426 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 2026-09-03.
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