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 OpenLinkSoftware/ai-agent-skills --skill mpp-stripe-clientgit clone --depth 1 https://github.com/OpenLinkSoftware/ai-agent-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/openlinksoftware/ai-agent-skills/mpp-stripe-client)<a href="https://agentmods.dev/skills/openlinksoftware/ai-agent-skills/mpp-stripe-client"><img src="https://agentmods.dev/badge/skills/openlinksoftware/ai-agent-skills/mpp-stripe-client/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/openlinksoftware/ai-agent-skills/mpp-stripe-client"><img src="https://agentmods.dev/badge/skills/openlinksoftware/ai-agent-skills/mpp-stripe-client.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium MCP Rug Pull · line 57 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 60 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
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 | $0.00055 | $0.00767 |
| Opus 5 | $0.00028 | $0.00383 |
| Sonnet 5 | $0.00011 | $0.00153 |
| Haiku 4.5 | $0.00006 | $0.00077 |
Grade A, and why
mpp-stripe-client 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 9d 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 — 92 lines — stays where its author put it; the contents beside it link to each section on GitHub.
MPP Stripe Client Skill
When to Use
- "Pay for this resource at ..."
- "Access this MPP-protected URL ..."
- "Use Stripe to pay for ..."
- "Run MPP client against ..."
- Any request referencing a URL that returns
402 Payment Requiredwith an MPP challenge.
Prerequisites
The project must be installed at ~/Documents/Management/Development/mpp-stripe-client/:
cd ~/Documents/Management/Development/mpp-stripe-client
npm install
A Stripe test secret key (sk_test_...) is required. Set it as an environment variable:
export STRIPE_SECRET_KEY=sk_test_...
Or the skill will ask for it.
Workflow
⛔ PRE-BUILD CHECK: Before producing output, re-read the relevant workflow section above and re-read any checklists or verification gates defined in this skill. Confirm each checklist item before writing output. Build to pass — do not retro-fit. Apply the CLAUDE.md Anti-Drift Protocol: re-read spec section before build, gate-first validation, section-by-section delivery.
Step 1 — Collect target URL and Stripe key
Ask the user for:
- Target URL — the MPP-protected resource to access
- Stripe secret key — if
STRIPE_SECRET_KEYis not already in the environment
If no URL is provided, ask for it. Do not assume defaults.
Step 2 — Run the MPP client
With the target URL and Stripe key confirmed, execute the client. The client runs from the installed project directory and accepts the target URL as SERVER_URL:
cd ~/Documents/Management/Development/mpp-stripe-client \
&& SERVER_URL="<target-url>" STRIPE_SECRET_KEY="<key>" npx tsx cli.ts
Do not use npm run cli — it reads .env which overrides inline variables with localhost defaults. Always invoke npx tsx cli.ts directly with inline SERVER_URL and STRIPE_SECRET_KEY.
The client will:
GET <target-url>— receive402 Payment Requiredwith challenge- Create a Stripe test payment method
- Create a Stripe Shared Payment Token (SPT) scoped to the challenge amount
GET <target-url>withAuthorization: Payment <credential>- Receive
200with the paid resource and receipt
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.
- 9d ago First seen · 92 lines · 55 tokens per session scan A 9af95b45dffb
mpp-stripe-client is a skill published in the GitHub repository OpenLinkSoftware/ai-agent-skills (38 stars, last pushed today), licensed MIT. It adds 55 tokens to every session and 767 once invoked, about $0.0003 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 2026-08-30.
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