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 joomcode/joompulse-skills --skill product-change-monitorgit clone --depth 1 https://github.com/joomcode/joompulse-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/joomcode/joompulse-skills/product-change-monitor)<a href="https://agentmods.dev/skills/joomcode/joompulse-skills/product-change-monitor"><img src="https://agentmods.dev/badge/skills/joomcode/joompulse-skills/product-change-monitor/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/joomcode/joompulse-skills/product-change-monitor"><img src="https://agentmods.dev/badge/skills/joomcode/joompulse-skills/product-change-monitor.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00226 | $0.03742 |
| Opus 5 | $0.00113 | $0.01871 |
| Sonnet 5 | $0.00045 | $0.00748 |
| Haiku 4.5 | $0.00023 | $0.00374 |
Grade A, and why
product-change-monitor 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.
How it starts
The opening of the file, as written. The whole thing — 295 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Product Change Monitor
This skill shows how one product — or a few of them — changed over a period, by default the last week, on Mercado Livre (Brasil) or Shopee Brasil, using JoomPulse market data. Given a product by a marketplace link, a JoomPulse link, or a listing, item or catalog product identifier, it reports for each product the current value and the change versus about a week ago for the metrics that have real history (price, rating, review count), plus the current snapshot for estimated sales and revenue, how long the listing has been on air, and the seller and logistics attributes that marketplace actually has. The result is a change table plus a downloadable spreadsheet; on Mercado Livre each row links to its JoomPulse page, on Shopee each row links to the item on Shopee.
This is different from a single point-in-time analysis. To size up a product and find the products that compete with it, use the single-product analysis skill. To decide which new products to add across a whole catalog, use the gap-analysis skill. This skill answers "how did this product move over time?" for a product the user names.
Prerequisites
- JoomPulse MCP access is configured for the current agent environment.
- The user provides a marketplace — Mercado Livre (Brasil) or Shopee Brasil — and one product (or a small set) as a marketplace link, a JoomPulse link, or a listing, item or catalog product identifier.
- The available JoomPulse tools can look up a product's current market data and its price and reviews history on either marketplace. The shape of that history differs: on Mercado Livre it is a daily series, on Shopee a record per change (see Step 2).
If JoomPulse MCP access is unavailable, stop and explain that the skill requires JoomPulse MCP setup before it can monitor a product's changes.
Scope
- Mercado Livre (Brasil) and Shopee Brasil, one at a time. Other marketplaces are out of scope.
- Sales and revenue are JoomPulse estimates — not real transactions. Disclose this in every output. By contrast, price, rating, and review count are real history from the marketplace — say so, it is a strength of the report. The estimates are built differently on each marketplace: on Mercado Livre from historical listing data, on Shopee from the marketplace's own rounded sold counters refined with review movement. Use the matching disclaimer.
- Read-only. The skill does not sign in as the seller or modify any listing.
- Language: detect the seller's language and respond in it. Default to pt-BR.
- Keep the workflow invisible. The seller wants the answer, not a play-by- play. If one approach does not return data, switch to another quietly; only if every approach fails do you say one short, friendly sentence.
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 · 295 lines · 226 tokens per session scan A 31204ec4cd2c
product-change-monitor is a skill published in the GitHub repository joomcode/joompulse-skills (50 stars, last pushed 23d ago), licensed MIT. It adds 226 tokens to every session and 3,742 once invoked, about $0.0011 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.
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