Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add mercadopago/mercadopago-claude-marketplace/plugin install mercadopagoWrote 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/commands/mercadopago/mercadopago-claude-marketplace/mp-test-cards)<a href="https://agentmods.dev/commands/mercadopago/mercadopago-claude-marketplace/mp-test-cards"><img src="https://agentmods.dev/badge/commands/mercadopago/mercadopago-claude-marketplace/mp-test-cards/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/commands/mercadopago/mercadopago-claude-marketplace/mp-test-cards"><img src="https://agentmods.dev/badge/commands/mercadopago/mercadopago-claude-marketplace/mp-test-cards.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00014 | $0.01570 |
| Opus 5 | $0.00007 | $0.00785 |
| Sonnet 5 | $0.00003 | $0.00314 |
| Haiku 4.5 | $0.00001 | $0.00157 |
Grade A, and why
mp-test-cards 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 13d 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 — 134 lines — stays where its author put it; the contents beside it link to each section on GitHub.
/mp-test-cards
Returns test card numbers for Mercado Pago. No MCP authentication required — data is served from the bundled references/products.md.
Step 0 — Read the bundled source
Use ${CLAUDE_PLUGIN_ROOT}/skills/mp-integrate/references/products.md. Claude Code resolves ${CLAUDE_PLUGIN_ROOT} to the active plugin version. Never copy .mcp.json, scan an installation cache, or load another marketplace copy. This command remains fully offline.
Step 1 — Resolve country
- If
$ARGUMENTScontains a country code (AR,BR,MX,CO,CL,UY,PE) → use it directly. - Otherwise, read
.mp-integrate-progress.mdin the project root. Usecountry:field if present. - Otherwise, ask once via
AskUserQuestion:header="Country"- Options:
"AR — Argentina"/"BR — Brazil"/"MX — Mexico"/"CO — Colombia"+ Other (for CL, UY, PE)
Step 2 — Return test cards
Read ${CLAUDE_PLUGIN_ROOT}/skills/mp-integrate/references/products.md with the Read tool. Do not search a cache or another marketplace. If Claude Code cannot resolve the active root, use the bundled fallback table in Step 2b instead of loading a different plugin copy.
If no file is found by any method, skip to the fallback in Step 2b.
Step 2b — Fallback (file not found)
If products.md cannot be located, output the test cards inline from the table below. Do not call any MCP tool. Do not call search_documentation.
Hardcoded fallback data is embedded in this command only for this scenario — it is not the source of truth.
AR (MLA) — Expiry: 11/30 · CVV: 123 (Amex: 1234)
| Card number | Brand | Type |
|---|---|---|
| 5031 7557 3453 0604 | Mastercard | Credit |
| 4509 9535 6623 3704 | Visa | Credit |
| 3711 803032 57522 | Amex | Credit |
| 5287 3383 1025 3304 | Mastercard | Debit |
| 4002 7686 9439 5619 | Visa | Debit |
BR (MLB) — Expiry: 11/30 · CVV: 123 (Amex: 1234)
| Card number | Brand | Type |
|---|---|---|
| 5031 4332 1540 6351 | Mastercard | Credit |
| 4235 6477 2802 5682 | Visa | Credit |
| 3753 651535 56885 | Amex | Credit |
| 5067 2680 5566 8045 | Elo | Credit |
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.
- 13d ago First seen · 134 lines · 14 tokens per session scan A 677277f8abfb
mp-test-cards is a command published in the GitHub repository mercadopago/mercadopago-claude-marketplace (26 stars, last pushed 9d ago), licensed Apache-2.0. It adds 14 tokens to every session and 1,570 once invoked, about $0.0001 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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