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 mercadopago/mercadopago-claude-marketplace --skill mp-webhooksgit clone --depth 1 https://github.com/mercadopago/mercadopago-claude-marketplaceWrote 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/mercadopago/mercadopago-claude-marketplace/mp-webhooks)<a href="https://agentmods.dev/skills/mercadopago/mercadopago-claude-marketplace/mp-webhooks"><img src="https://agentmods.dev/badge/skills/mercadopago/mercadopago-claude-marketplace/mp-webhooks/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/mercadopago/mercadopago-claude-marketplace/mp-webhooks"><img src="https://agentmods.dev/badge/skills/mercadopago/mercadopago-claude-marketplace/mp-webhooks.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, 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 Privilege Escalation · line 46 Code accesses credential files (SSH keys, AWS credentials, etc.). This could indicate credential theft attempts.Fix: Remove references to credential paths. Use environment variables or secrets managers. For docs, use placeholder paths (e.g., /path/to/config). Never load .env or token files in production code paths.
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 | $0.00055 | $0.01999 |
| Opus 5 | $0.00028 | $0.01000 |
| Sonnet 5 | $0.00011 | $0.00400 |
| Haiku 4.5 | $0.00006 | $0.00200 |
Grade A, and why
mp-webhooks 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 12d 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 — 198 lines — stays where its author put it; the contents beside it link to each section on GitHub.
mp-webhooks
This skill is for everything notifications. It is the only place where the HMAC validation pattern lives — every other skill defers here.
Step 0 — Connect only for an MCP-backed action
Do not inspect MCP state when this skill starts. Scaffolding and reviewing the receiver pattern are static operations and require no MCP connection.
Connect only immediately before one of these selected operations:
| Operation | Required MCP tool |
|---|---|
| Fetch a language-specific signature example | search_documentation |
| Resolve an unknown or country-specific topic | search_documentation |
| Register or rotate the callback URL | save_webhook |
| Confirm or diagnose webhook delivery | notifications_history |
On-demand authentication procedure:
- Attempt the intended tool directly if callable. Do not call
application_listas a connection probe. - If it is unavailable or returns an authentication error, call
mcp__plugin_mercadopago_mcp__authenticate. - Show the clickable OAuth link in the developer's language and instruct them to Cmd+Click (Mac) or Ctrl+Click (Windows/Linux), without copying the URL into an external browser.
- When the developer returns, retry the intended tool directly. Never ask them to paste a callback URL.
- If MCP tools are not loaded, explain how to enable
plugin:mercadopago:mcp. Keep any static scaffold/review work available offline.
Show this prerequisites checklist only when the developer selects an MCP-backed action:
Before configuring webhooks live, you'll need:
- [ ] A Mercado Pago developer account
- [ ] An app created in the Developer Dashboard
- [ ] Test credentials: APP_USR- access token + public key (tab {test_tab})
- [ ] The webhook signature secret (Dashboard → Webhooks → Signature secret)
Connection will be requested immediately before the selected MCP operation.
Step 1 — Decide the action
Ask the developer (or infer from $ARGUMENTS) which of these they want:
| Action | Tool to call | When |
|---|---|---|
| Configure the webhook URL on the MP application | save_webhook |
First time setup or rotating the endpoint |
| Diagnose delivery failures | notifications_history |
Investigating missed/failed notifications |
| Scaffold the receiver code | (no MCP call — render the pattern below) | Adding the receiver to the codebase |
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.
- 12d ago First seen · 198 lines · 55 tokens per session scan A 3a73f03995c4
mp-webhooks is a skill published in the GitHub repository mercadopago/mercadopago-claude-marketplace (26 stars, last pushed 8d ago), licensed Apache-2.0. It adds 55 tokens to every session and 1,999 once invoked, about $0.0003 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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