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 marketplace-advertisinggit 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/marketplace-advertising)<a href="https://agentmods.dev/skills/finsilabs/awesome-ecommerce-skills/marketplace-advertising"><img src="https://agentmods.dev/badge/skills/finsilabs/awesome-ecommerce-skills/marketplace-advertising/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/marketplace-advertising"><img src="https://agentmods.dev/badge/skills/finsilabs/awesome-ecommerce-skills/marketplace-advertising.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 | $0.00031 | $0.02557 |
| Opus 5 | $0.00015 | $0.01278 |
| Sonnet 5 | $0.00006 | $0.00511 |
| Haiku 4.5 | $0.00003 | $0.00256 |
Grade B, and why
marketplace-advertising scanned grade B with 1 finding 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.
Sends data to an external URLmediumData exfiltration
A POST to an outside endpoint may be telemetry or may be exfiltration; either way the mod talks to somewhere, and you should know where.
const response = await fetch('https://api.amazon.com/auth/o2/token', { method: 'POST', How it starts
The opening of the file, as written. The whole thing — 215 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Marketplace Advertising
Overview
Marketplace advertising (Amazon Sponsored Products, Walmart Connect, eBay Promoted Listings) puts your products in front of shoppers with high purchase intent directly on the platform where they are shopping. Unlike Google/Meta, marketplace ads run within a closed ecosystem — clicks and conversions happen on the marketplace, not your site. The strategic work is campaign structure, keyword harvesting, and bid management. Amazon's native Campaign Manager UI handles most of this without code; automation tools like Perpetua or Sellics add bid optimization rules on top.
When to Use This Skill
- When selling on Amazon and needing a structured campaign setup from scratch
- When ACOS (Advertising Cost of Sale) is above your target and needs systematic optimization
- When running campaigns across multiple marketplaces and needing unified reporting
- When wanting to automate keyword harvesting and bid adjustments without building custom scripts
- When launching a new product and needing an auto-campaign to discover converting search terms
Core Instructions
Step 1: Choose the right advertising management approach
| Approach | Best For | Platforms | Price |
|---|---|---|---|
| Amazon Campaign Manager (native) | All sellers, getting started | Amazon | Free (% of ad spend) |
| Perpetua | Automation + goal-based bidding | Amazon, Walmart, Instacart | $250+/mo |
| Sellics (now Perpetua) | Analytics-heavy sellers | Amazon | $250+/mo |
| Jungle Scout | Sellers wanting product research + ads in one tool | Amazon | $49+/mo |
| Pacvue | Enterprise, multi-marketplace | Amazon, Walmart, Target | Custom |
| Walmart Campaign Center (native) | Walmart sellers | Walmart | Free (% of ad spend) |
Start with Amazon's native Campaign Manager for campaign setup. Once you have 30 days of data, add Perpetua or Jungle Scout for automated bid optimization if managing more than 5 active campaigns.
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/bid-optimization-with-acos-based-adjustm/criteria.json 2.5 KB
- evals/bid-optimization-with-acos-based-adjustm/task.md 1.6 KB
- evals/campaign-structure-and-budget-allocation/criteria.json 2.4 KB
- evals/campaign-structure-and-budget-allocation/task.md 1.5 KB
- evals/keyword-harvesting-from-auto-to-manual-c/criteria.json 2.3 KB
- evals/keyword-harvesting-from-auto-to-manual-c/task.md 1.8 KB
- tile.json 311 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 · 215 lines · 31 tokens per session scan B 9797d687f668
marketplace-advertising is a skill published in the GitHub repository finsilabs/awesome-ecommerce-skills (52 stars, last pushed 6mo ago), licensed MIT. It adds 31 tokens to every session and 2,557 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it B with 1 finding (sends data to an external url). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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sealeap-amazon-prime-day-planning
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sealeap-amazon-uk-apparel-ads
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sealeap-amazon-full-funnel-growth
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