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 coldtatooine/vuln-skill-pack --skill stripe-securitygit clone --depth 1 https://github.com/coldtatooine/vuln-skill-packWrote 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/coldtatooine/vuln-skill-pack/stripe-security)<a href="https://agentmods.dev/skills/coldtatooine/vuln-skill-pack/stripe-security"><img src="https://agentmods.dev/badge/skills/coldtatooine/vuln-skill-pack/stripe-security/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/coldtatooine/vuln-skill-pack/stripe-security"><img src="https://agentmods.dev/badge/skills/coldtatooine/vuln-skill-pack/stripe-security.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 | $0.00048 | $0.00950 |
| Opus 5 | $0.00024 | $0.00475 |
| Sonnet 5 | $0.00010 | $0.00190 |
| Haiku 4.5 | $0.00005 | $0.00095 |
Grade A, and why
stripe-security 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 10d 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 — 61 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Stripe Security Footguns
Apply when the app integrates Stripe (Checkout, Payment Intents, Subscriptions, webhooks). Payment code moves money, so bugs are directly monetizable. Pair with /scan, /preflight, /secrets.
Verify before flagging
pk_*in the client / public env is expected; only flagsk_*,rk_*,whsec_*outside server-only contexts.- Distinguish test vs live keys: still flag committed secret keys, but treat live as higher severity.
- Missing idempotency is a finding when fulfillment has side effects (credits, shipping, entitlements) — not every read-only webhook handler.
livemodechecks matter when production must ignore test events (or vice versa); don't flag if both modes are intentionally handled.
1. Webhook signature verification (Critical)
- Every webhook endpoint must verify the Stripe signature using the endpoint's signing secret (
stripe.webhooks.constructEvent(rawBody, sig, secret)). Without it, anyone can POST a fakecheckout.session.completedand get free fulfillment. - Use the raw request body, not parsed JSON. Frameworks that auto-parse the body (Express
json(), Next.js default body parsing) break verification — the signature is computed over raw bytes. Disable body parsing on the webhook route. - Reject on verification failure. Don't fall through to processing.
- Allowlist event types you handle; ignore or reject unexpected types instead of a catch-all switch that fulfills on anything.
- If production should only process live traffic, check
event.livemode(or equivalent) before fulfilling.
2. Never trust amounts or entitlements from the client
- Price/amount must come from the server, looked up from your product catalog by product ID — never sent from the browser. A client that posts
amount: 1to your Payment Intent creation pays 1 cent for a $100 item. - Same for quantity, currency, discount, and entitlement (which plan/features the user gets). Compute server-side from trusted data.
- With Checkout, prefer server-created
line_itemsreferencing Stripe Price IDs over client-suppliedprice_data.
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.
- 10d ago First seen · 61 lines · 0 tokens per session scan A b586c8f91d1c
stripe-security is a skill published in the GitHub repository coldtatooine/vuln-skill-pack (2 stars, last pushed 15d ago), licensed MIT. It adds 48 tokens to every session and 950 once invoked, about $0.0002 per session on Opus 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 2026-08-31.
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