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/typeform-webhooksnpx skills add hookdeck/webhook-skills --skill typeform-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/typeform-webhooks)<a href="https://agentmods.dev/skills/hookdeck/webhook-skills/typeform-webhooks"><img src="https://agentmods.dev/badge/skills/hookdeck/webhook-skills/typeform-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 | $0.00043 | $0.01637 |
| Opus 5 | $0.00022 | $0.00818 |
| Sonnet 5 | $0.00009 | $0.00327 |
| Haiku 4.5 | $0.00004 | $0.00164 |
Grade A, and why
typeform-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
77% identical to adyen-webhooks — 182 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 — 149 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Typeform Webhooks
When to Use This Skill
- How do I receive Typeform webhooks?
- How do I verify Typeform webhook signatures?
- How do I handle
form_response(form submission) events? - Why is my
Typeform-Signatureverification failing? - Understanding Typeform event types and the
form_responsepayload
Verification (core)
Typeform signs the raw request body with HMAC-SHA256 keyed on your per-webhook
secret. The digest is base64-encoded (not hex) and sent in the
Typeform-Signature header prefixed with sha256=. Pass the raw body, build
sha256=<base64 digest>, and compare timing-safe. Typeform does not follow the
Standard Webhooks spec, and there is no signature-verification SDK — verify manually.
Node:
const crypto = require('crypto');
function verifyTypeformSignature(rawBody, signatureHeader, secret) {
if (!signatureHeader) return false;
const hash = crypto.createHmac('sha256', secret).update(rawBody).digest('base64');
const expected = `sha256=${hash}`;
try {
return crypto.timingSafeEqual(Buffer.from(signatureHeader), Buffer.from(expected));
} catch {
return false; // length mismatch = invalid
}
}
Python:
import hmac, hashlib, base64
def verify_typeform_signature(raw_body: bytes, signature_header: str, secret: str) -> bool:
if not signature_header:
return False
digest = hmac.new(secret.encode(), raw_body, hashlib.sha256).digest()
expected = "sha256=" + base64.b64encode(digest).decode()
return hmac.compare_digest(expected, signature_header)
Important: The signing secret is only sent when you add one to the webhook (Connect > Webhooks > Edit > Add a Secret, or via the Webhooks API). If no secret is configured, no
Typeform-Signatureheader is sent.
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 220 B
- examples/express/package.json 372 B
- examples/express/README.md 979 B
- examples/express/src/index.js 3.0 KB runs code
- examples/express/test/webhook.test.js 4.5 KB runs code
- examples/fastapi/.env.example 220 B
- examples/fastapi/main.py 2.4 KB runs code
- examples/fastapi/README.md 1.2 KB
- examples/fastapi/requirements.txt 82 B
- examples/fastapi/test_webhook.py 4.6 KB runs code
- examples/nextjs/.env.example 220 B
- examples/nextjs/app/webhooks/typeform/route.ts 2.2 KB runs code
- examples/nextjs/package.json 484 B
- examples/nextjs/README.md 1022 B
- examples/nextjs/test/webhook.test.ts 3.2 KB runs code
- examples/nextjs/vitest.config.ts 140 B runs code
- references/overview.md 4.2 KB
- references/setup.md 2.6 KB
- references/verification.md 4.4 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 · 149 lines · 43 tokens per session scan A 26d5037da3b7
typeform-webhooks is a skill published in the GitHub repository hookdeck/webhook-skills (84 stars, last pushed yesterday), licensed MIT. It adds 43 tokens to every session and 1,637 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 77% identical to adyen-webhooks, differing in 182 lines, and is treated as a copy.
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