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 hookdeck/webhook-skills --skill mongodb-atlas-webhooksgit clone --depth 1 https://github.com/hookdeck/webhook-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/hookdeck/webhook-skills/mongodb-atlas-webhooks)<a href="https://agentmods.dev/skills/hookdeck/webhook-skills/mongodb-atlas-webhooks"><img src="https://agentmods.dev/badge/skills/hookdeck/webhook-skills/mongodb-atlas-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/hookdeck/webhook-skills/mongodb-atlas-webhooks"><img src="https://agentmods.dev/badge/skills/hookdeck/webhook-skills/mongodb-atlas-webhooks.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 | $0.00089 | $0.01612 |
| Opus 5.5 | $0.00036 | $0.00645 |
| Sonnet 5.5 | $0.00018 | $0.00322 |
| Haiku 4.5 | $0.00009 | $0.00161 |
Grade A, and why
mongodb-atlas-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 3d 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 — 121 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MongoDB Atlas Webhooks
When to Use This Skill
- How do I receive MongoDB Atlas alert webhooks?
- How do I verify the Atlas
X-MMS-Signaturewebhook header? - Why does my Atlas webhook signature verification fail (base64 vs hex, SHA-1, raw body)?
- How do I handle
OUTSIDE_METRIC_THRESHOLDorHOST_DOWNalerts andOPEN/CLOSEDstatus? - What do I do if my Atlas webhook has no secret (no signature header)?
Verification (core)
Atlas signs alert webhooks only when you set a Webhook Secret. The X-MMS-Signature header is the base64-encoded HMAC-SHA1 of the raw request body, keyed with the secret as a plain string (not decoded). There is no timestamp and no prefix. Without a secret the header is absent, so reject unsigned requests if you expect signing.
const crypto = require('crypto');
function verifyAtlasSignature(rawBody, signature, secret) {
if (!signature || !secret) return false;
const expected = crypto.createHmac('sha1', secret).update(rawBody).digest('base64');
try {
return crypto.timingSafeEqual(Buffer.from(signature), Buffer.from(expected));
} catch {
return false; // length mismatch
}
}
For complete handlers with tests, see examples/express/, examples/nextjs/, examples/fastapi/.
Common Event Types
Atlas alert payloads share the Administration API Alerts resource shape. Dispatch on eventTypeName; status is OPEN or CLOSED (the docs give these as examples).
eventTypeName |
Description |
|---|---|
OUTSIDE_METRIC_THRESHOLD |
A metric (see metricName, currentValue) crossed its alert threshold |
HOST_DOWN |
A host is down |
The full list of alert event types lives in the Atlas Administration API alerts documentation. The X-MMS-Event header carries the alert state: alert.open, alert.close, alert.update, alert.acknowledge, alert.cancel, alert.inform.
For payload fields and more, see references/overview.md.
What ships with it
20 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.
- examples/express/.env.example 161 B
- examples/express/package.json 388 B
- examples/express/README.md 1.4 KB
- examples/express/src/index.js 3.7 KB runs code
- examples/express/test/webhook.test.js 4.9 KB runs code
- examples/fastapi/.env.example 161 B
- examples/fastapi/main.py 3.2 KB runs code
- examples/fastapi/README.md 1.5 KB
- examples/fastapi/requirements.txt 82 B
- examples/fastapi/test_webhook.py 4.5 KB runs code
- examples/nextjs/.env.example 161 B
- examples/nextjs/app/webhooks/mongodb-atlas/route.ts 2.5 KB runs code
- examples/nextjs/lib/verify-atlas.ts 780 B runs code
- examples/nextjs/package.json 533 B
- examples/nextjs/README.md 1.5 KB
- examples/nextjs/test/webhook.test.ts 4.5 KB runs code
- examples/nextjs/vitest.config.ts 140 B runs code
- references/overview.md 2.5 KB
- references/setup.md 1.5 KB
- references/verification.md 1.9 KB
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.
- 3d ago First seen · 121 lines · 89 tokens per session scan A 5e79643de983
mongodb-atlas-webhooks is a skill published in the GitHub repository hookdeck/webhook-skills (94 stars, last pushed 2d ago), licensed MIT. It adds 89 tokens to every session and 1,612 once invoked, about $0.0004 per session on Opus 5.5. 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 2026-10-22.
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