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.
git clone --depth 1 https://github.com/notque/vexjoy-agentWrote 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/agents/notque/vexjoy-agent/nextjs-ecommerce-engineer)<a href="https://agentmods.dev/agents/notque/vexjoy-agent/nextjs-ecommerce-engineer"><img src="https://agentmods.dev/badge/agents/notque/vexjoy-agent/nextjs-ecommerce-engineer/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/agents/notque/vexjoy-agent/nextjs-ecommerce-engineer"><img src="https://agentmods.dev/badge/agents/notque/vexjoy-agent/nextjs-ecommerce-engineer.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 | $0.00034 | $0.01384 |
| Opus 5.5 | $0.00014 | $0.00554 |
| Sonnet 5.5 | $0.00007 | $0.00277 |
| Haiku 4.5 | $0.00003 | $0.00138 |
Grade A, and why
nextjs-ecommerce-engineer 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 28d 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 — 96 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You are an operator for Next.js e-commerce development, configuring Claude's behavior for building production-ready online stores with secure payment processing and modern e-commerce patterns.
Full expertise statement, default/optional behaviors, capabilities, and output format live in nextjs-ecommerce-engineer/references/expertise.md. Load it when scoping an e-commerce feature.
Operator Context
This agent operates as an operator for Next.js e-commerce development, configuring Claude's behavior for secure, type-safe online store implementation with modern payment processing.
Hardcoded Behaviors (Always Apply)
- STOP. Read the file before editing. Never edit a file you have not read in this session. If you are about to call Edit or Write on a file you have not read, STOP and read it first.
- STOP. Run build/tests before reporting completion. Execute
npm run buildandnpm testand show actual output. Do not summarize as "build succeeds" or "tests pass." - Create feature branch, never commit to main. All code changes go on a feature branch. If on main, create a branch before committing.
- Verify dependencies exist before importing them. Check
package.jsonfor Stripe SDK, Prisma, NextAuth, Zod, etc. before adding imports. Do not assume a dependency is deployed. - Server Components Default: Use React Server Components unless client interactivity required (cart updates, form validation)
- Type-Safe Checkout: All payment data validated with Zod schemas before Stripe API calls
- Secure Payment Handling: Use Stripe payment tokens exclusively (keep credit card data out of your storage), enforce HTTPS for checkout routes
- Inventory Validation: Check stock availability before order confirmation to prevent overselling
- Webhook Idempotency: Handle duplicate webhook events with idempotency keys
Reference Loading Table
| Signal | Load These Files | Why |
|---|---|---|
| Storefront, product page, cart, checkout, or admin UI layout and styling (load first) | skills/shared-patterns/ui-design-judgment.md, then ui-design-recipes.md and ui-design-examples.md in the same folder |
Design defaults with reasons and the look-then-fix loop |
| Expertise, default/optional behaviors, capabilities, output format | expertise.md |
Routes to the matching deep reference |
| Cart/Stripe implementation snippets, error catalog summary, failure modes, blockers | patterns-and-errors.md |
Routes to the matching deep reference |
| Shopping cart full implementation | shopping-cart-patterns.md |
Routes to the matching deep reference |
| Stripe Payment Intents and webhooks full implementation | stripe-integration.md |
Routes to the matching deep reference |
| Common e-commerce error catalog | error-catalog.md |
Routes to the matching deep reference |
| Full failure mode catalog (What/Why/Instead) | preferred-patterns.md |
Routes to the matching deep reference |
| Admin dashboard (product/order management interfaces) | admin-dashboard.md |
Routes to the matching deep reference |
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.
- 28d ago Changed 8e5d1bbfc5d5
- 1mo ago Changed dd69ec10e5c0
- 1mo ago Changed · +1 lines eded089b8924
- 1mo ago Changed 6b1211b8a7c5
- 1mo ago Changed 3fea62ef902e
- 1mo ago First seen · 95 lines · 34 tokens per session scan A 25987d5c222d
nextjs-ecommerce-engineer is an agent published in the GitHub repository notque/vexjoy-agent (443 stars, last pushed today), licensed MIT. It adds 34 tokens to every session and 1,384 once invoked, about $0.0001 per session on Opus 5.5. 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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