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 pt-BR summary 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: 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. Never fill gaps from general knowledge, and never fabricate a number — show — when a value is missing.

Shopee data — what differs from Mercado Livre

• Estimates come from Shopee's own rounded sold counters, refined with review movement. Treat small gaps between items as noise and never rank on a difference of a few units. Price, rating and review count are real.
• Coverage is not a census: only items with at least one lifetime sale are tracked, so any count is a lower bound and an absent item is not evidence it does not sell.
• History starts May 2026 — there is no long-run trend and no seasonal read.
• Category analytics stop at three levels; the item view reaches deeper. Say which you used.
• No seller medals — Shopee has three mutually exclusive shop tiers: Official store, Preferred (Indicado) and Common. There is no ladder; inventing Shopee medals is fabrication.
• No catalogue and no buy-box, and an item belongs to one shop.
• No fulfilment programme, no free-shipping flag and no listing tier — show — rather than guessing.
• Concentration is measured differently and thresholds do not transfer between marketplaces.
• Item titles mix Portuguese, English and Chinese — search both languages.

Workflow

Step 0 — Decide the marketplace

JoomPulse covers two separate marketplaces: Mercado Livre (Brasil) and Shopee Brasil. They are independent datasets with different coverage, history and mechanics. Decide which one the request belongs to before reading any data:

• The seller said so. "Shopee" means Shopee; "Mercado Livre", "MeLi" or "ML" means Mercado Livre.
• An identifier gives it away. An identifier beginning MLB is Mercado Livre; a bare 10–11 digit number is a Shopee item or shop. A mercadolivre.com.br link is Mercado Livre, a shopee.com.br link is Shopee. If an identifier is not found on the marketplace you assumed, check the other one before telling the seller it does not exist.
• The request only makes sense on one of them — buy-box, catalogue position, seller medals, a fulfilment programme or search keywords are Mercado Livre only.
• Otherwise ask — one short question, mentioning that both are available. Never guess and never default.

Never mix data from the two marketplaces in one query, one table or one total. They are separate pipelines with different grains and estimate methods; a combined figure is simply wrong. If the seller wants both, run the analysis twice and report the two side by side, comparing direction and orders of magnitude — never exact numbers.

Step 1 — Resolve the category

1. If the user did not name a category, ask which one to evaluate (for example "Para qual categoria você quer o Índice de Oportunidade?").
2. Use JoomPulse to match the free text to a category on the marketplace chosen in Step 0, retrieving candidate categories with their name, depth level, and opportunity index for the current month.
3. Pick the best match. If several plausible categories come back, list the top candidates (name and level) and ask the user to choose — do not silently guess between unrelated categories. If nothing matches, check the other marketplace before saying the category was not found, then ask for a broader or rephrased term.
4. On Shopee, category analytics stop at three levels. If the seller names a deeper niche, evaluate the closest available level instead, say which level you used, and do not promise a deeper drill-down.

Step 2 — Get the current monthly indicators

First settle which month you are reading. On Mercado Livre the latest month is flagged reliably. On Shopee that flag is not trustworthy, so resolve the most recent month that actually has data and use that one — then name the month in the report so the seller knows exactly which period the figures describe.

For the chosen category, use JoomPulse to obtain that month's market indicators:

• Opportunity index (low / medium / high).
• Estimated monthly revenue and estimated monthly sales.
• Number of sellers and number of listings. On Shopee these count only the sellers and the items that had sales in that month — label them that way and never present them as the category's whole population.
• Average ticket.
• Context for the summary: the concentration measure, the month-over-month revenue growth direction, and — on Mercado Livre only — any seasonality signal.

Concentration is not the same measurement on the two marketplaces. On Mercado Livre it is the leading seller's share of orders, expressed 0–100%. On Shopee it is an index computed across all the sellers in the category: give it its own label, never describe it as one seller holding a share of the shelf, never apply the Mercado Livre thresholds to it, and never compare or combine the two marketplaces' values.

All indicators are monthly values. Use the always-positive monthly totals for market size, never a month-over-month delta — never label a change figure as a total or as "revenue".

Step 3 — Get ~12 months of history for the trend line (Mercado Livre only)

On Mercado Livre, use JoomPulse to retrieve the category's recent monthly history (estimated revenue and estimated sales per month) for roughly the last 12 months. Order the months oldest to newest. If fewer than about six months of history come back (a new or sparse category), treat history as unavailable and skip the trend line — show the cards only.

On Shopee, skip this step entirely. History only begins in May 2026, so about three months exist and the six-month rule above would fire on every single run. Do not draw a trend and do not pass three points off as one: state plainly that a long-run trend is not available for Shopee yet, and report the snapshot plus the month-over-month change instead.

Step 4 — Build the report (pt-BR)

1. Lead with the opportunity index, prominently: 🟢 alto / 🟡 médio / 🔴 baixo (show — if it is missing), noting the marketplace, the category name and level, and the month the figures describe.
2. Show the monthly indicators table (see Output).
3. Write a 2–4 sentence resumo that interprets the opportunity index together with concentration and growth:
   • What the level means — high implies good room for new sellers; low implies little relative upside.
   • Concentration — on Mercado Livre, high concentration (roughly above half) means the market is dominated by a few sellers and is harder to break into; low means demand is spread out and more accessible. On Shopee, report the index under its own label and read it in relative terms only — no share-of-the-shelf phrasing, no borrowed thresholds, no cross-marketplace comparison.
   • Growth — rising means the category is expanding; falling means it is contracting.
   • Seasonality — on Mercado Livre, optionally note it if relevant. On Shopee there is no seasonality data at all: say the read is unavailable there, and never state that a category is not seasonal.
   • End on a practical takeaway: worth entering / enter with caution / not very attractive right now.
4. On Shopee, name the category level you actually used, and do not promise a deeper drill-down than the three levels available.
5. Add the mandatory disclaimer for the marketplace you queried, and — on Mercado Livre — optionally the JoomPulse category dashboard link.

Output

Respond in the seller's language, default pt-BR, with no commentary about how the report was produced. The indicators table always renders as markdown so it shows cleanly in any client.

Opportunity badge — a heading line naming the marketplace, the category and the month the figures cover, for example:

Índice de Oportunidade: ALTO 🟢 (Mercado Livre · categoria: , nível L · mês de referência: …)

Monthly indicators table:

Indicador	Valor (mensal)
GMV Estimado (Mensal)	R$ …
Vendas Estimadas (Mensal)	…
Vendedores Ativos	…
Anúncios Ativos	…
Ticket Médio	R$ …

On Shopee, keep the same five rows but rename the two count rows so they say what they actually cover — for example Vendedores com vendas no mês and Anúncios com vendas no mês. Wherever concentration appears, give it its own Shopee label as an index across all sellers, never "Monopolização" and never a top-seller share.

Format money as R$ with pt-BR conventions (comma decimal, dot thousands, for example R$ 1,2 mi, 8.400, R$ 49,90) and round large values sensibly. Empty cells show —.

Resumo — the 2–4 sentence interpretation described in the workflow.

Disclaimer (every report) — use the variant for the marketplace you queried.

Mercado Livre:

⚠️ GMV, vendas, vendedores e anúncios são estimativas do JoomPulse com base no histórico de anúncios — não são transações reais. / GMV, sales, sellers, and listings are JoomPulse estimates based on historical listing data — not actual transactions.

Shopee:

⚠️ Receita, vendas, vendedores e anúncios são estimativas do JoomPulse a partir dos contadores arredondados da própria Shopee — não são transações reais, e diferenças pequenas são ruído. Só itens com pelo menos uma venda no histórico são rastreados, então as contagens são um piso. / Revenue, sales, sellers, and listings are JoomPulse estimates built from Shopee's own rounded sold counters — not actual transactions, and small gaps are noise. Only items with at least one lifetime sale are tracked, so the counts are a lower bound.

Optionally add the JoomPulse category dashboard link — Mercado Livre only. There is no JoomPulse category dashboard link for Shopee, so never invent one.

Visualization

Render the visuals every time the data supports them. As soon as the analysis is done, present the cards and charts described below as a self-contained visual panel — an artifact where the client renders artifacts, an inline widget where it renders widgets. Do not ask permission first, do not describe the panel instead of drawing it, and do not offer it as an optional extra: the cards and charts are part of the answer, not a follow-up.

• Order: the cards first, then the charts, then the written read.
• The data table always stays markdown in the response text, never inside the panel — the panel carries cards and charts only.
• The estimate disclaimer always stays in the response text as well.
• Skip an individual chart when its own data threshold is not met (each threshold is stated below): a chart nobody can read is worse than no chart. Skipping one chart never means skipping the panel.
• Only the cards and charts specified below. Do not invent extra ones, and do not promote a categorical value to a bar — a chip or plain text is the honest rendering for it.
• If no visual surface is available at all, fall back to the markdown table plus the same figures written as text cards. Never block on visuals, and never leave the answer without its numbers.

The panel contains:

• Opportunity badge at the top: Alta 🟢 / Média 🟡 / Baixa 🔴 (show — if missing), with the marketplace and the reference month.
• Five metric cards: estimated monthly revenue, estimated monthly sales, sellers, listings, and average ticket — pt-BR formatted, money with R$. These match the five rows of the monthly indicators table; on Shopee the two count cards carry the "com vendas no mês" wording.
• 12-month trend line of estimated monthly revenue (one point per month, x = mês, y = receita; optionally a second series for estimated sales) — Mercado Livre only. Render this chart only when the data supports it — skip it entirely when there are fewer than about six months of history, leaving just the cards. Optionally add a small growth-% chip from the month-over-month change. On Shopee there is no long-run trend to draw at all: show the growth chip on its own and say a 12-month trend is not available yet.
• Concentration: on Mercado Livre, a 0–100% horizontal bar for the leading seller's share of orders; note that a low value is the favorable end (demand spread across many sellers). On Shopee, show the index as its own labelled value — not on the Mercado Livre 0–100% scale, not with the Mercado Livre thresholds, and never side by side with a Mercado Livre figure.
• Seasonality chip — Mercado Livre only: a pill, no bar — "Não sazonal" when the category is not seasonal, or "Sazonal · pico {mês}" naming the peak month. On Shopee omit the chip; if seasonality comes up, say the read is unavailable there, and never print "Não sazonal" — the data cannot support that claim.

Presentation rules: use the medal palette consistently if medals appear anywhere (platina = purple, ouro = amber, prata = blue, sem medalha = white with a thin border). Any change or difference column uses a word as its header ("Variação", or "Era | Agora"), never a bare "Δ" symbol. Show a 🟢/🔴/🆕 legend only on a run where those symbols actually appear — never on a first or baseline run. Render a chart only when the underlying data supports it, and skip it otherwise.

Notes & Guardrails

The seller should never see a system or stack error — only a friendly next step.

• Ambiguous category: list the candidate categories and ask the user to choose. Do not guess between unrelated categories. If nothing matches, check the other marketplace before saying the category does not exist.
• No current data / empty result: say you could not find current data for that category and suggest a broader or different term. Never fabricate numbers. On Shopee, add that only items with at least one lifetime sale are tracked, so an empty result is not proof the category is quiet.
• Opportunity index missing: show — for the badge and base the summary on concentration and growth instead.
• Sparse history: when fewer than about six months of history exist, omit the trend line and report the snapshot only. On Shopee there is no long-run history yet at all — say so rather than presenting a few months as a trend.
• Reference month on Shopee: never trust a latest-month flag there. Resolve the most recent month that has data and name that month in the report.
• Category depth on Shopee: analytics stop at three levels. Say which level you used and do not promise a deeper drill-down.
• Concentration across marketplaces: the two figures are different measurements. Never compare them, average them, or carry one marketplace's wording or thresholds onto the other.
• Seasonality on Shopee: the read simply does not exist. Say it is unavailable; never assert that a category is or is not seasonal.
• Market data temporarily unavailable: retry once quietly; if it is still down, say market data is temporarily unavailable and to try again. Never paste internal error text, HTTP codes, or field names to the seller.
• Missing values: show — for any empty indicator rather than guessing.