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 deck-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/deck-webhooks)<a href="https://agentmods.dev/skills/hookdeck/webhook-skills/deck-webhooks"><img src="https://agentmods.dev/badge/skills/hookdeck/webhook-skills/deck-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/deck-webhooks"><img src="https://agentmods.dev/badge/skills/hookdeck/webhook-skills/deck-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 | $0.00128 | $0.02776 |
| Opus 5.5 | $0.00051 | $0.01110 |
| Sonnet 5.5 | $0.00026 | $0.00555 |
| Haiku 4.5 | $0.00013 | $0.00278 |
Grade A, and why
deck-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 today.
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 -X POST https://api.deck.co/v2/event-destinations \ This is a copy
77% identical to adyen-webhooks — 199 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 — 174 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Deck Webhooks
Deck is an API for computer-use agents that log in to websites on a user's behalf. Deck pushes events to event destinations. This skill covers the webhook destination type: HTTP POST deliveries signed with Standard Webhooks.
When to Use This Skill
- How do I receive Deck webhooks?
- How do I verify a Deck webhook signature?
- Where do I get my Deck webhook signing secret? (You generate it yourself.)
- How do I handle
task_run.interaction_requiredand answer an MFA prompt? - Why is my Deck
webhook-signatureverification failing? - How do I rotate a Deck webhook secret without downtime?
- My Deck destination is stuck in
pending_verification. What's wrong?
The Secret Is Yours to Generate
Deck does not issue a signing secret. webhook.secret is optional and caller-provided: you generate it, send it when you create the destination, and Deck can't show it to you again. Without one, you can't verify deliveries.
# "whsec_" + base64 of random bytes (24–32 bytes is the Standard Webhooks
# convention; Deck's docs don't specify a length)
node -e "console.log('whsec_' + require('crypto').randomBytes(32).toString('base64'))"
curl -X POST https://api.deck.co/v2/event-destinations \
-H "Authorization: Bearer sk_live_..." -H "Content-Type: application/json" \
-d '{"name":"Production Webhook","type":"webhook",
"webhook":{"url":"https://your-app.com/webhooks/deck","secret":"whsec_..."},
"events":["credential.verified","task_run.completed","task_run.failed"]}'
New destinations start as pending_verification and become active (firing event_destination.activated) once your endpoint returns a 2xx. Deck doesn't document a challenge or handshake. Your endpoint has to be reachable and return a 2xx. See references/setup.md.
Verification (core)
| Header | Value |
|---|---|
webhook-id |
Unique event identifier |
webhook-timestamp |
Unix seconds when the delivery was sent |
webhook-signature |
v1,<base64 HMAC-SHA256>, possibly several space-separated entries |
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 679 B
- examples/express/package.json 496 B
- examples/express/README.md 2.1 KB
- examples/express/src/index.js 8.0 KB runs code
- examples/express/test/webhook.test.js 8.6 KB runs code
- examples/fastapi/.env.example 684 B
- examples/fastapi/main.py 8.6 KB runs code
- examples/fastapi/README.md 2.3 KB
- examples/fastapi/requirements.txt 106 B
- examples/fastapi/test_webhook.py 9.4 KB runs code
- examples/nextjs/.env.example 631 B
- examples/nextjs/app/webhooks/deck/route.ts 7.9 KB runs code
- examples/nextjs/package.json 613 B
- examples/nextjs/README.md 2.1 KB
- examples/nextjs/test/webhook.test.ts 8.9 KB runs code
- examples/nextjs/vitest.config.ts 164 B runs code
- references/overview.md 9.8 KB
- references/setup.md 7.1 KB
- references/verification.md 7.8 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.
- today First seen · 174 lines · 128 tokens per session scan A d3b603e4abe7
deck-webhooks is a skill published in the GitHub repository hookdeck/webhook-skills (92 stars, last pushed yesterday), licensed MIT. It adds 128 tokens to every session and 2,776 once invoked, about $0.0005 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). It is 77% identical to adyen-webhooks, differing in 199 lines, and is treated as a copy.
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