Top Sellers In Category

Top Sellers In Category

This skill returns the top sellers in one Mercado Livre (Brasil) category, ranked by estimated average monthly revenue. For each seller it shows estimated average monthly sales and revenue, completed sales over the last 365 days, cancellation rate, sales trend, brands, how their products split between all listings and listings with sales, international shipping, and classic versus premium listing counts.

By default it produces today's leaderboard as a downloadable table. It can also show how the ranking moved over time: if you supply a previous-period leaderboard that this skill produced for the same category, it compares the two and reports each seller's movement (rose / fell / new) plus the biggest movers. The baseline is the table you supply — there is no hidden session memory.

To monitor a single named seller over time, use the seller-overview-tracker skill. To rank brands rather than sellers, use the top-brand-position-tracker skill.

Prerequisites

• JoomPulse MCP access is configured for the current agent environment.
• The user names a category (free text is fine).
• For a period comparison, the user supplies a previous leaderboard that this skill produced for the same category (pasted or uploaded). Without it, the skill produces a standalone leaderboard.
• The available JoomPulse tools can find the sellers active in a category and return each seller's profile (estimated average monthly sales and revenue, last-365-day completed sales, cancellation rate, sales trend, brands, listing distribution, international shipping, classic and premium listing counts). Seller medal — used to color the chart — and reputation are read when available.

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

Scope

• Mercado Livre (Brasil) only. Other marketplaces are out of scope.
• Sales and revenue are JoomPulse estimates derived from historical listing data — not real transactions. Cancellation rate and last-365-day completed sales are real history. Disclose the estimate caveat in every output.
• Read-only. The skill never writes or modifies anything; it does not store the leaderboard — the user keeps the downloadable table and brings it back next period.
• Language: detect the seller's language and respond in it. Default to pt-BR.
• The baseline is user-supplied. Never claim a movement without a previous leaderboard to compare against, and never infer or fabricate one from memory.

Workflow

Step 1 — Resolve the category and find its sellers

Ask for a category if none was given, then use JoomPulse to match the free text to a category and find the sellers active in it.

Step 2 — Rank by estimated average monthly revenue

Rank the sellers by estimated average monthly revenue, highest first. Keep a sensible top (default about 50, up to about 100 on request), and treat the count as a cap — show fewer if fewer exist.

Step 3 — Present today's leaderboard and offer it for download

Render the leaderboard for today (head it with the category name and the date). This table is the deliverable — and offer it as a downloadable file (.csv / .xlsx) so the user can save it and bring it back next period as the baseline. On a standalone leaderboard there is no movement column and no legend.

Step 4 — Offer comparison, and compare if a previous leaderboard is supplied

Invite the user to send a previous leaderboard for the same category to compare periods. If they provide one, align by seller and report:

• a Variação column per seller: 🟢 subiu N / 🔴 caiu N / 🆕 novo / = igual, and note sellers that left the top in a short "saíram do top" line;
• a short Destaques block — biggest risers 🟢 and biggest fallers 🔴.

A movement requires both an old and a new position/value for the same seller — no previous entry means "novo", never a fabricated trend. Show the 🟢/🔴 legend only in the comparison (where the markers actually appear), never on a plain leaderboard. The change column header is a word ("Variação"), never a bare "Δ".

Output

Respond in the seller's language (default pt-BR).

Leaderboard (always): a markdown table, plus a downloadable .csv / .xlsx:

• The Vendedor name links to the seller's JoomPulse page.

Comparison (only when a previous leaderboard is supplied): the same table plus a Variação column, and a Destaques block (maiores altas / maiores quedas).

Disclaimer (every report):

⚠️ Vendas e receita são estimativas do JoomPulse com base no histórico de anúncios — não são transações reais. Taxa de cancelamento e vendas dos últimos 365 dias são dados reais do Mercado Livre.

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:

• Four cards: number of sellers in the category (and how many have sales), the leader's share of the shortlist's revenue, the average monthly revenue across the top, and the average ticket.
• A horizontal bar of the top ~10 sellers by estimated average monthly revenue, colored by seller medal — platina = purple, ouro = amber, prata = blue, sem medalha = white with a thin border (white needs the border to stay visible on a light background). Include a small legend mapping color to medal. When one seller dwarfs the rest, you may show that leader as a separate highlighted figure and chart the remaining leaders so the medal colors stay readable.
• A small "registered versus with sales" comparison for sellers and for products, to show how much of the supply actually converts.

Presentation rules: use the medal palette consistently; render a chart only when the data supports it; the movement/Variação column uses a word header, never a bare "Δ", and its 🟢/🔴 legend appears only when a comparison is shown.

Notes & Guardrails

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

• No previous leaderboard supplied: render today's leaderboard only (no movement column, no legend) and invite the user to save it for next time.
• Supplied table is for a different category, malformed, or unreadable: say so plainly and fall back to the leaderboard only; do not force a misaligned comparison.
• Small sample: if only a few sellers come back, say so rather than implying it is the whole category.
• 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.
• Never silently limit coverage — state the top cap you used.