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/picqer-webhooksnpx skills add hookdeck/webhook-skills --skill picqer-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/picqer-webhooks)<a href="https://agentmods.dev/skills/hookdeck/webhook-skills/picqer-webhooks"><img src="https://agentmods.dev/badge/skills/hookdeck/webhook-skills/picqer-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 | $0.00055 | $0.01782 |
| Opus 5 | $0.00028 | $0.00891 |
| Sonnet 5 | $0.00011 | $0.00356 |
| Haiku 4.5 | $0.00006 | $0.00178 |
Grade A, and why
picqer-webhooks 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 yesterday.
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.
curl -u YOUR_API_KEY: https://YOURSUBDOMAIN.picqer.com/api/v1/hooks \ How it starts
The opening of the file, as written. The whole thing — 175 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Picqer Webhooks
When to Use This Skill
- How do I receive Picqer webhooks?
- How do I verify Picqer webhook signatures (
X-Picqer-Signature)? - How do I handle
orders.completed,picklists.closed, orproducts.stock_changedevents? - Why is my Picqer webhook signature verification failing?
- Setting up a Picqer hook via the API (
POST /api/v1/hooks)
Verification (core)
Picqer signs the raw request body with HMAC-SHA256 keyed on the per-hook
secret you set when creating the hook, and sends the digest base64-encoded
in the X-Picqer-Signature header. Pass the raw body (never re-serialized
JSON) and compare timing-safe.
Important: The
secretis optional at hook creation. If you create a hook without a secret, Picqer sends noX-Picqer-Signatureheader and signature verification is impossible. Always set a secret so requests can be verified.
Node:
const crypto = require('crypto');
function verifyPicqerWebhook(rawBody, signatureHeader, secret) {
if (!signatureHeader || !secret) return false;
const expected = crypto.createHmac('sha256', secret).update(rawBody).digest('base64');
try {
return crypto.timingSafeEqual(Buffer.from(signatureHeader), Buffer.from(expected));
} catch {
return false; // length mismatch = invalid
}
}
Python:
import hmac, hashlib, base64
def verify_picqer_webhook(raw_body: bytes, signature_header: str, secret: str) -> bool:
if not signature_header or not secret:
return False
expected = base64.b64encode(
hmac.new(secret.encode(), raw_body, hashlib.sha256).digest()
).decode()
return hmac.compare_digest(signature_header, expected)
The event type is in the JSON body's event field (there is no event header).
Verify the raw body first, then parse and dispatch on payload.event.
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 203 B
- examples/express/package.json 368 B
- examples/express/README.md 1.3 KB
- examples/express/src/index.js 4.5 KB runs code
- examples/express/test/webhook.test.js 4.5 KB runs code
- examples/fastapi/.env.example 131 B
- examples/fastapi/main.py 3.7 KB runs code
- examples/fastapi/README.md 1.1 KB
- examples/fastapi/requirements.txt 82 B
- examples/fastapi/test_webhook.py 4.7 KB runs code
- examples/nextjs/.env.example 131 B
- examples/nextjs/app/webhooks/picqer/route.ts 3.5 KB runs code
- examples/nextjs/package.json 480 B
- examples/nextjs/README.md 1.2 KB
- examples/nextjs/test/webhook.test.ts 3.7 KB runs code
- examples/nextjs/vitest.config.ts 140 B runs code
- references/overview.md 4.7 KB
- references/setup.md 3.2 KB
- references/verification.md 4.1 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.
- yesterday First seen · 175 lines · 55 tokens per session scan A 7128f8b4b2a6
picqer-webhooks is a skill published in the GitHub repository hookdeck/webhook-skills (84 stars, last pushed yesterday), licensed MIT. It adds 55 tokens to every session and 1,782 once invoked, about $0.0003 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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