Ship-It Engineering Stack
The five production-grade build skills every SaaS needs before launch, in one bundle. Stand up secure accounts and multi-tenancy (Auth & Multi-Tenant SaaS Foundation), ship subscription billing (Stripe Subscription Engine), run zero-downtime database migrations (DB Migration Guardian), send reliable transactional email (Transactional Email Engine), and ship an accessible UI (Accessibility Gate) — complete, hardened implementations wired to your stack instead of one-off snippets. Built for founders and engineers shipping a real SaaS fast. Save versus buying each separately.
Works with every agent that reads SKILL.md — Claude Code, Cursor, Codex CLI, Gemini CLI, GitHub Copilot, Windsurf, OpenClaw, and more.
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What's included
5 skills
Scaffold a complete, production-ready Stripe subscription system — Checkout, customer portal, hardened webhooks, plans, seats, proration, and dunning — wired to your database.
Scaffold a complete, production-ready transactional email system — verification, password reset, receipts, and notifications — with deliverability hardening, retries, idempotency, and a suppression list.
Plan, review, and execute safe database migrations with automatic rollback plans, backfill strategies, and zero-downtime sequencing.
Audit your frontend for accessibility violations before release — flags WCAG failures, gives prioritized fixes, and blocks the broken patterns that get sites sued.
Scaffold a complete, production-ready auth and multi-tenant foundation — sessions, OAuth/SSO, role-based access control, organizations, teams, invitations, and row-level data isolation — wired to your app and database.
See it in action
You say
Set up subscription billing for my Next.js SaaS. I have three plans (Starter, Pro, Team) with Team being per-seat. Use Stripe and our existing Postgres + Prisma setup. I need upgrades to prorate and failed payments to retry before cancelling.
Your agent does
I've scaffolded the full billing layer:
- Prisma models: Customer, Subscription, Price, and a WebhookEvent log for idempotency.
- /api/checkout route that creates a Checkout Session for Starter/Pro/Team (Team collects seat quantity).
- /api/webhooks/stripe with signature verification and an exactly-once handler for created/updated/deleted, invoice.paid, and invoice.payment_failed.
- Customer Portal session route for self-serve upgrades, downgrades (prorated), and cancellations.
- Dunning: 3 smart retries over 7 days with email hooks, then a grace period before downgrade. Next step: add your Stripe price IDs to .env (placeholders generated) and run the included webhook test script against the Stripe CLI.
How to install
Drop the file into your AI Agent. Works with Claude, Cursor, ChatGPT, and 20+ more.