I'm a QA tester from Ireland building my first digital asset. Here is a free AI Context Shield for Next.js 16 + Tailwind v4.

Hey everyone,
I’m a junior QA tester based in Ireland, currently balancing a 9-to-5 while spending my evenings learning how to orchestrate web applications using modern AI assistants. To build toward financial independence, I decided to stop just thinking about launching a side project and actually package my local developer setups into my first digital asset.
Over the last few weekends, I’ve been building out a clean, hardware-efficient Next.js 16 + Tailwind CSS v4 + Drizzle + Neon Postgres skeleton.
But I ran into a major roadblock: because LLM training data is dominated by years of older documentation, my AI coding assistant (Claude/Cursor) kept hallucinating legacy JavaScript config files (tailwind.config.js) and deprecated React syntaxes instead of writing Tailwind v4's modern CSS-first theme directives.
To solve this, I built a strict local workspace rules file (.ai-context.md) that you can drop into your project root. It completely stops AI agents from generating deprecated or legacy code.
Here is the raw rules markdown if you want to drop it into your local workspace:

Workspace AI Rules & Context

This workspace operates under strict modern web development guidelines for a Next.js 16 ecosystem as of 2026. All terminal and editor AI agents MUST adhere to these architectural mandates.

---

Core Stack Metadata

• Year: 2026
• Framework: Next.js 16 (App Router)
• CSS Framework: Tailwind CSS v4 (CSS-First Theme Engine)
• ORM & Driver: Drizzle ORM paired with neondatabase/serverless connection pooling
• Language: Strictly TypeScript (Strict Mode, 100% type safety)

---

Crucial Restrictions (No-Go Zone)

1. Never Generate tailwind.config.js / tailwind.config.ts:
   Tailwind CSS v4 utilizes a modern, CSS-first engine. All custom theme variables, directives, utilities, and configuration are written directly inside the global CSS file (src/app/globals.css) using [@theme](/theme), [@import](/import), or native CSS variables. Any generation or restoration of legacy configuration files is strictly prohibited.
2. Never Use Deprecated React Syntaxes:
   Avoid legacy patterns such as React.FC or React.SFC for typing functional components. Rely on standard TypeScript parameters and type annotations. Avoid deprecated hooks or outdated server component patterns.
3. Never Fall Back to Inline Styling or Custom CSS modules:
   All styles must leverage Tailwind v4 utility classes. No extraneous CSS files or styled-components are allowed.

---

TypeScript & Resource Optimization

• Low Memory Utilization: Write code optimized for low memory usage to ensure highly performant execution in serverless edge runtimes (e.g., Vercel, Cloudflare, Cloud Run).
• Pool Connection Integrity: Ensure the serverless PostgreSQL connection pool via neondatabase/serverless and Drizzle is handled cleanly without connection leaks.
• Strict Type Definitions: Avoid using any. Every database entity, query payload, API response, and component prop must be fully type-safe. Ensure types are dynamically inferred from Drizzle schemas (e.g., using $inferSelect and $inferInsert) where possible.

Hopefully, this saves some of you a few hours of frustrating debugging loops during your weekend builds.
Since compiling this stack cleanly in Turbopack (took about 4.3 seconds with zero warnings), I decided to package the entire verified repository, the setup instructions, and the raw prompt vaults into a single downloadable developer boilerplate on Gumroad to serve as my first independent digital asset:
https://eremiaandrei.gumroad.com/l/buiyc
I'm incredibly excited to have shipped my first real product. If you're building a micro-product soon and want to bypass the database and style setup headaches altogether, any support on the blueprint is deeply appreciated.
I'd also love to hear: how are you managing local AI rules files in your repos, or have you run into similar legacy hallucinations when trying to build with React 19?