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 linkfox-ai/linkfox-skills --skill linkfox-mercado-product-selectiongit clone --depth 1 https://github.com/linkfox-ai/linkfox-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/linkfox-ai/linkfox-skills/linkfox-mercado-product-selection)<a href="https://agentmods.dev/skills/linkfox-ai/linkfox-skills/linkfox-mercado-product-selection"><img src="https://agentmods.dev/badge/skills/linkfox-ai/linkfox-skills/linkfox-mercado-product-selection/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/linkfox-ai/linkfox-skills/linkfox-mercado-product-selection"><img src="https://agentmods.dev/badge/skills/linkfox-ai/linkfox-skills/linkfox-mercado-product-selection.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high System Prompt Leakage · line 89 Skill contains instructions that could directly expose system prompts, internal rules, or hidden instructions to users or external parties.Fix: Remove any instructions that reveal, print, or output system prompts or internal rules. System instructions should never be exposed to end users.
- medium Excessive Agency · line 12 Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
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 | $0.00129 | $0.02330 |
| Opus 5 | $0.00064 | $0.01165 |
| Sonnet 5 | $0.00026 | $0.00466 |
| Haiku 4.5 | $0.00013 | $0.00233 |
Grade A, and why
linkfox-mercado-product-selection scanned grade A 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
- `references/api.md`: LinkFox gateway contract, request/response structure, error codes, curl example, and Feedback API. How it starts
The opening of the file, as written. The whole thing — 129 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Mercado Libre Product Selection
This skill queries Mercado Libre product, catalog, keyword, category, trend, seller, review, exchange-rate, and plan-usage data through the LinkFox gateway. The gateway exposes one unified route, POST /mercado/productSelection, and the skill selects one of 24 supported toolName values with matching arguments.
Core Concepts
- Call only
${LINKFOX_TOOL_GATEWAY}/mercado/productSelection. Do not call the upstream XP-MCP server directly, and do not ask the user for upstreamsecret-key/X-API-Key— upstream credentials are owned by the backend. - The request body is always
{"toolName":"...","arguments":{...}}. The script takes this whole object as a single JSON argument. - Field names inside
argumentsmust matchreferences/mercado-tool-reference.mdexactly, including camelCase names such assiteId,itemId,productId,categoryId,runDate,runMonth,pageNo,pageSize. - Read
datafirst when presenting results. ReadcontentTextwhendatais text or ambiguous. ShowrawResponseonly when the user asks for raw diagnostics. - Paid tools currently cost
16000tokens per call; free tools cost0. Trust the backendcostTokenfield.
Reference Files
references/api.md: LinkFox gateway contract, request/response structure, error codes, curl example, and Feedback API.references/mercado-tool-reference.md: detailed Chinese reference for the 24 Mercado Libre tools — parameters, site IDs, pagination, sorting, and billing status.
Tool Selection
| User intent | Use these tools |
|---|---|
| Product detail, product sales history, product search | itemInfo, itemHistory, itemSearch |
| Catalog/product page detail, catalog sales history, catalog search | catalogInfo, catalogHistory, catalogSearch |
| Daily/monthly hot keywords and reverse traffic keywords | keywordDateSearch, keywordMonthSearch, keywordReverse |
| Category lookup before paid analysis | categorySearch, categorySmallSearch |
| Category brand, item, seller, new item, price, sales, sold-history, statistics, warehouse distribution | trendBrandTopBrand, trendBrandTopItem, trendBrandTopSeller, trendNewItems, trendPrice, trendSale, trendSoldHis, trendStatistical, trendStoreInventoryType |
| Seller search | sellerSearch |
| Product reviews | reviewSearch |
| Exchange rate and package usage | rateInfo, myUsage |
What ships with it
5 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.
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 · 129 lines · 129 tokens per session scan A 5c7dfc248772
linkfox-mercado-product-selection is a skill published in the GitHub repository linkfox-ai/linkfox-skills (101 stars, last pushed 22d ago), licensed MIT. It adds 129 tokens to every session and 2,330 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.
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