category-opportunity-index

category-opportunity-index is a skill for Claude Code from joomcode/joompulse-skills. It costs 221 tokens per session (4,744 once invoked), scanned A, original, MIT.

A category-research skill that rates one Mercado Livre Brazil or Shopee Brazil category as having low, medium, or high opportunity using current marketplace data. It also summarizes sales, revenue, sellers, listings, average price, market concentration, and growth.

In plain words
What is it for?
It is for evaluating a category at a point in time, including its competition, growth, and available history or seasonality data where provided.
Why use it?
It turns several marketplace measures into a plain-language view of whether entering a category may be worthwhile.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the joompulse-skills plugin — 18 skills, 1 MCP server shipped together

Good fit It is for evaluating a category at a point in time, including its competition, growth, and available history or seasonality data where provided.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/joomcode/joompulse-skills/category-opportunity-index
Install

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.

Any agent
npx skills add joomcode/joompulse-skills --skill category-opportunity-index
Clone the repo
git clone --depth 1 https://github.com/joomcode/joompulse-skills

Made for: Claude Code.

Or install joompulse-skills, the plugin that ships this one along with the rest of its 18 skills, 1 MCP server.

Wrote 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.

agentmods badge for category-opportunity-index

README.md
[![agentmods](https://agentmods.dev/badge/skills/joomcode/joompulse-skills/category-opportunity-index/github.svg)](https://agentmods.dev/skills/joomcode/joompulse-skills/category-opportunity-index)
Your own site
<a href="https://agentmods.dev/skills/joomcode/joompulse-skills/category-opportunity-index"><img src="https://agentmods.dev/badge/skills/joomcode/joompulse-skills/category-opportunity-index/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.

agentmods 80×15 button for category-opportunity-index

Your own site · 80×15
<a href="https://agentmods.dev/skills/joomcode/joompulse-skills/category-opportunity-index"><img src="https://agentmods.dev/badge/skills/joomcode/joompulse-skills/category-opportunity-index.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 221 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,744 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00221 $0.04744
Opus 5.5 $0.00088 $0.01898
Sonnet 5.5 $0.00044 $0.00949
Haiku 4.5 $0.00022 $0.00474

Measured 1mo ago against content hash dc5d6ba673fd, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

category-opportunity-index 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 1mo 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.

skills/category-opportunity-index/SKILL.md · 369 lines

How it starts

The opening of the file, as written. The whole thing — 369 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Category Opportunity Index

This skill answers a single question for one category on Mercado Livre (Brasil) or Shopee Brasil: is it worth entering? Given a marketplace and a category named in free text, it reads that category's opportunity index (low, medium, or high) and its current monthly market indicators — estimated revenue, estimated sales, sellers, listings, and average ticket — then writes a short summary, in the language the seller wrote in, that interprets the opportunity level together with how concentrated the market is and which way it is growing. On Mercado Livre the summary can also draw on a year of history and a seasonality read; on Shopee neither exists yet, and the report says so plainly instead of guessing.

This is a point-in-time snapshot, not a tracker. To rank the sellers inside a category, use the top-sellers-in-category skill. For the trending search terms shoppers use in a category, use the top-keywords-in-my-category skill. To compare a category's aggregates against a user-supplied previous snapshot, use the category-monitor skill. This skill answers "how attractive is this category right now?" for a category 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 names the category to evaluate (free text is fine).
  • The available JoomPulse tools can resolve a category name to a category on either marketplace and return that category's current monthly market indicators, plus — on Mercado Livre — its recent monthly history.

If JoomPulse MCP access is unavailable, stop and explain that the skill requires JoomPulse MCP setup before it can report a category's opportunity index.

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. The seller, listing, and average-ticket figures shown here are estimates too. Disclose this in every output. 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 never writes or modifies anything.
  • Language: write in the language of the message you are answering, and default to pt-BR only when that is unclear. Never infer the language from the store, its listings or the marketplace — those are Brazilian whatever language the seller writes in, so a seller who asks in English gets the whole report in English.
  • 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. Never fill gaps from general knowledge, and never fabricate a number — show — when a value is missing.

Read the full file on GitHub · 369 lines

Changes

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.

  1. 1mo ago Changed · +24 lines dc5d6ba673fd
  2. 2mo ago First seen · 345 lines · 221 tokens per session scan A b650b8d2f4cf

Subscribe to this mod's changes

category-opportunity-index is a skill published in the GitHub repository joomcode/joompulse-skills (54 stars, last pushed 3d ago), licensed MIT. It adds 221 tokens to every session and 4,744 once invoked, about $0.0009 per session on Opus 5.5. 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.

Related

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