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 agentmods add skills/hookdeck/webhook-skills/nuvemshop-webhooksnpx skills add hookdeck/webhook-skills --skill nuvemshop-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/nuvemshop-webhooks)<a href="https://agentmods.dev/skills/hookdeck/webhook-skills/nuvemshop-webhooks"><img src="https://agentmods.dev/badge/skills/hookdeck/webhook-skills/nuvemshop-webhooks.svg" alt="Measured on agentmods" 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 | $0.00072 | $0.01638 |
| Opus 5 | $0.00036 | $0.00819 |
| Sonnet 5 | $0.00014 | $0.00328 |
| Haiku 4.5 | $0.00007 | $0.00164 |
Grade A, and why
nuvemshop-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 2d 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.
This is a copy
73% identical to adyen-webhooks — 181 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 152 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Nuvemshop (Tiendanube) Webhooks
When to Use This Skill
- How do I receive Nuvemshop / Tiendanube webhooks?
- How do I verify Nuvemshop webhook signatures?
- How do I handle
order/created,order/paid, ororder/cancelledevents? - Why is my
x-linkedstore-hmac-sha256verification failing? - Setting up a webhook receiver for a Nuvemshop app
Verification (core)
Nuvemshop signs the raw request body with HMAC-SHA256 keyed on your
app's client secret (the OAuth app secret from the Partners Portal) and sends
the digest hex-encoded in the x-linkedstore-hmac-sha256 header. Compute the
HMAC on the exact raw bytes before JSON parsing and compare timing-safe.
There is no official SDK — verification is manual in every language.
Node:
const crypto = require('crypto');
function verifyNuvemshopWebhook(rawBody, hmacHeader, clientSecret) {
if (!hmacHeader) return false;
const expected = crypto
.createHmac('sha256', clientSecret)
.update(rawBody) // rawBody is a Buffer/string of the exact bytes
.digest('hex');
try {
return crypto.timingSafeEqual(Buffer.from(hmacHeader), Buffer.from(expected));
} catch {
return false; // length mismatch = invalid
}
}
Python:
import hmac, hashlib
def verify_nuvemshop_webhook(raw_body: bytes, hmac_header: str, client_secret: str) -> bool:
if not hmac_header:
return False
expected = hmac.new(client_secret.encode(), raw_body, hashlib.sha256).hexdigest()
return hmac.compare_digest(hmac_header, expected)
Important: Respond with a
2XXstatus within 3 seconds. Nuvemshop retries on timeout/non-2XX (immediately, then ~5/10/15 min, then exponential backoff ×1.4, up to 18 attempts over 48h). Do slow work asynchronously.
For complete handlers with route wiring, event dispatch, and tests, see:
What ships with it
19 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 196 B
- examples/express/package.json 387 B
- examples/express/README.md 1.3 KB
- examples/express/src/index.js 4.0 KB runs code
- examples/express/test/webhook.test.js 4.5 KB runs code
- examples/fastapi/.env.example 196 B
- examples/fastapi/main.py 3.4 KB runs code
- examples/fastapi/README.md 1.2 KB
- examples/fastapi/requirements.txt 82 B
- examples/fastapi/test_webhook.py 4.5 KB runs code
- examples/nextjs/.env.example 196 B
- examples/nextjs/app/webhooks/nuvemshop/route.ts 3.1 KB runs code
- examples/nextjs/package.json 499 B
- examples/nextjs/README.md 1.0 KB
- examples/nextjs/test/webhook.test.ts 3.3 KB runs code
- examples/nextjs/vitest.config.ts 140 B runs code
- references/overview.md 3.6 KB
- references/setup.md 2.6 KB
- references/verification.md 3.4 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.
- 2d ago First seen · 152 lines · 72 tokens per session scan A 0091ac84690c
nuvemshop-webhooks is a skill published in the GitHub repository hookdeck/webhook-skills (84 stars, last pushed 2d ago), licensed MIT. It adds 72 tokens to every session and 1,638 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. It is 73% identical to adyen-webhooks, differing in 181 lines, and is treated as a copy.
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