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 charlieviettq/awesome-agent-skill --skill ecom-promo-roigit clone --depth 1 https://github.com/charlieviettq/awesome-agent-skillWrote 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/charlieviettq/awesome-agent-skill/ecom-promo-roi)<a href="https://agentmods.dev/skills/charlieviettq/awesome-agent-skill/ecom-promo-roi"><img src="https://agentmods.dev/badge/skills/charlieviettq/awesome-agent-skill/ecom-promo-roi/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/charlieviettq/awesome-agent-skill/ecom-promo-roi"><img src="https://agentmods.dev/badge/skills/charlieviettq/awesome-agent-skill/ecom-promo-roi.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 | $0.00090 | $0.01013 |
| Opus 5 | $0.00045 | $0.00507 |
| Sonnet 5 | $0.00018 | $0.00203 |
| Haiku 4.5 | $0.00009 | $0.00101 |
Grade A, and why
"ecom-promo-roi" 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.
This is a copy
94% identical to ecom-promo-roi — 8 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 100 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Promotion ROI Analysis
Framework
IRON LAW: Measure INCREMENTAL Sales, Not Total Sales During Promo
A promotion that generates $100K in revenue during a sale week looks great —
until you realize $80K would have happened anyway (baseline). The incremental
lift is only $20K. If the discount cost $25K in margin, the promo LOST money.
Promo ROI = (Incremental Revenue × Margin - Promo Cost) / Promo Cost
Key Metrics
| Metric | Formula |
|---|---|
| Incremental Revenue | Promo period revenue - Baseline revenue (what would have happened without promo) |
| Promo Cost | Discount amount + marketing spend + operational cost |
| Promo ROI | (Incremental Gross Profit - Promo Cost) / Promo Cost |
| Cannibalization Rate | % of promo sales that would have occurred at full price |
| Pull-Forward Rate | % of promo sales that are just earlier purchases (customers would have bought next week anyway) |
Promo Type Comparison
| Type | Mechanism | Pros | Cons |
|---|---|---|---|
| % Discount | 20% off everything | Simple, high traffic | Erodes brand, trains discount-waiting |
| $ Off | NT$200 off orders >NT$1000 | Drives AOV up | Less exciting for low-AOV customers |
| BOGO | Buy one get one free | Moves inventory fast | 50% margin hit, attracts deal-seekers |
| Gift with purchase | Free item with min spend | Protects price perception | Cost of gift, may not drive incremental |
| Flash sale | Time-limited deep discount | Urgency, high engagement | Operational stress, cannibalization |
| Loyalty points | Earn/redeem points | Builds retention, deferred cost | Complex to manage, redemption liability |
Analysis Steps
Phase 1: Establish Baseline
- What would revenue have been without the promo? (prior period, prior year same period, or control group)
- Account for seasonality, day-of-week effects, and trend
Phase 2: Calculate Incremental Impact
- Total promo revenue - baseline = incremental
- Subtract cannibalization and pull-forward estimates
- Calculate gross profit on incremental (not revenue)
What ships with it
2 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.
- 9d ago First seen · 100 lines · 90 tokens per session scan A a1bbd92ea8a8
"ecom-promo-roi" is a skill published in the GitHub repository charlieviettq/awesome-agent-skill (26 stars, last pushed 1mo ago), licensed MIT. It adds 90 tokens to every session and 1,013 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 0 findings. It is 94% identical to ecom-promo-roi, differing in 8 lines, and is treated as a copy.
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