Built on Google's June 2026 "New SDLC with Vibe Coding" report

Stop your AI agent from writing spaghetti code.

Vibe coding gets you an 80% prototype. This kit — .cursorrules, a working Next.js + Supabase + Polar boilerplate, and a senior-engineer playbook — gets you the last 20% to production. For Cursor, Claude Code & Windsurf.

Get the kit — $19Read the free report summary

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The 80% problem, in plain terms

Google's report says it out loud: vibe coding is great for prototypes but stalls at ~80%. The last 20% — auth, database rules, payments, deployment — is where AI agents silently break things. Here's exactly where, and the fix.

✕
Confirming payment on the success redirect
→ Payment state changes ONLY from a signature-verified webhook.
✕
Row Level Security off (anon key reads every row)
→ RLS on every table, policy auth.uid() = user_id.
✕
Storing money as a float (0.1 + 0.2 ≠ 0.3)
→ Integer cents, always.
✕
Trusting getSession() cookie for server auth
→ Use getUser() — verified against the auth server.
✕
Unvalidated request bodies hitting your logic
→ Zod validation at every boundary, before the logic.
✕
Leaking stack traces & SQL in error responses
→ Generic message to client, detail to the logger only.

What's in the kit

Everything is enforced automatically inside your AI editor.

🧠 Folder-targeted rule files

.cursor/rules, CLAUDE.md and .windsurfrules that pin your stack, force spec-reading, and block the agent from rewriting working code.

⚙️ Working boilerplate

Next.js 15 + Supabase auth + Polar payments, wired and build-tested. Auth guard, RLS migrations, signature-verified idempotent webhooks.

📋 The Production Playbook

12 real traps AI-built apps die on, with the exact fix — the senior-engineer knowledge vibe coding never teaches.

✅ Spec templates + ship checklist

PRD.md, architecture.md, tasks.md and an 80%→100% checklist with copy-paste prompts for your agent.

$19 $39

One-time. Lifetime updates. Instant download.

Get the Vibe-to-Production Kit

Secure checkout via Polar · VAT handled · works with Cursor, Claude Code & Windsurf

Get the free report cheat sheet

The critical points of Google's "New SDLC with Vibe Coding" report + one free rule file. No spam — just the summary and a link.

FAQ

Does this work with Claude Code and Windsurf, not just Cursor?

Yes. The kit ships rule files for all three: .cursor/rules, CLAUDE.md, and .windsurfrules.

Stripe instead of Polar?

Supported — two files change, and the swap points are marked with comments.

Is the boilerplate actually tested?

Yes — it builds with zero type errors and the auth, checkout and webhook routes were verified live (401 on unauthenticated checkout, 403 on bad webhook signatures).

What do I need to run it?

A free Supabase project and a Polar account. The README walks you through both in ~20 minutes.