The AI Coding Stack 2026

Full AI Coding Kits per stack — not just rules files. Cursor + Claude Code get slash commands, MCP configs, prompt recipes, anti-hallucination tests. Everything wired to ship.

Plus the raw library: 30 .cursorrules, 30 CLAUDE.md, 110 curated prompts, live tool sheet. Quarterly updates for a year.

What's inside

1. Full AI Coding Kits — the flagship READY NOW

The reason this pack exists. Complete AI-first project setups per stack. Not scattered files — bundled, tested, ready to drop in.

• The Next.js AI Kit — .cursorrules + CLAUDE.md + 8 custom slash commands (/new-route, /audit-security, /to-server-component, /audit-perf, /generate-og, /add-mdx-post, /pre-deploy-check, /review-pr) + MCP server config + 12 multi-step prompt recipes + 10 anti-hallucination tests + 3 walked example tasks
• The FastAPI AI Kit — Python 3.12+ / Pydantic v2 / async SQLAlchemy. 6 slash commands (/new-endpoint, /add-migration, /audit-security, /optimize-query, /add-background-task, /review-pr). 10 recipes. 8 anti-hallucination tests catching Pydantic v1 leaks and fake FastAPI APIs.
• The Rust + Axum AI Kit — Axum + sqlx + tokio. 5 slash commands (/new-handler, /audit-security, /add-migration, /optimize-query, /review-pr). 8 recipes. 8 anti-hallucination tests catching fake crates + wrong sqlx macro syntax.

You cannot find this bundled anywhere. Individual pieces exist scattered across GitHub. No one else ships per-stack setups combining rules + slash commands + anti-hallucination tests + prompt recipes.

More kits shipping every quarter for buyers: Django, Rails, SwiftUI, Jetpack Compose, Flutter, Elixir Phoenix, .NET 8, Go/Fiber.

2. Anti-hallucination test suites (in every kit) UNIQUE

Fake APIs. Invented packages. Made-up config fields. Every AI IDE hallucinates — you just don't notice until it breaks prod. Each kit ships 8-10 tests you run against your own AI setup to catch these silently.

Example: "Use Next.js App Router's unstable_useServerAction hook" → Correct response: no such hook exists. If your AI generates code using it anyway, your rules need tightening.

3. Multi-step prompt recipes UNIQUE

Chained workflows, not isolated prompts. "Diagnose slow SSR page" walks the AI through: baseline → server timing → isolate hotspot → apply top fix. "Add auth to unauth endpoint" chains: threat check → auth guard → IDOR check → regression test. 30+ recipes total across the 3 kits.

4. Custom slash commands for Claude Code UNIQUE

Drop .claude/commands/*.md in your project and get /new-route, /audit-security, /optimize-query etc. — configured per stack, with the right constraints, tools, and follow-up questions baked in. 19 slash commands across the 3 kits.

5. 30 individual .cursorrules files READY NOW

For every stack we don't yet ship a full kit for. Each includes a Negative constraints section (do NOT rules) — the highest-signal part of any rules file.

• Frontend / Fullstack (8): Next.js+TS, React+Vite, Vite+React+Tailwind, Vue+Nuxt, Svelte 5+SvelteKit, SolidJS, Remix, Astro
• Backend (13): Node/Express, Node/Fastify, FastAPI, FastAPI+Pydantic v2, Django, Rails, Laravel, Spring Boot, .NET 8, Rust/Actix, Rust/Axum, Go/Gin, Go/Fiber
• Mobile (4): SwiftUI, Jetpack Compose, React Native+Expo, Flutter
• Systems / Infra (4): Cloudflare Workers, Elixir/Phoenix, Zig, Terraform/OpenTofu
• Universal (1): Universal minimal

6. 30 matching CLAUDE.md templates READY NOW

Same stacks, tuned for Claude Code's plan mode, slash commands, hooks, and MCP recommendations.

7. 110 curated prompts by task READY NOW

12 categories: code review, refactoring, debugging, docs, testing, SQL, workflow, security, performance, API design, migration, architecture. Every prompt copy-paste ready. Tested in Cursor, Claude Code, Copilot, Windsurf.

8. Live tool comparison sheet

Every AI coding tool tracked: pricing, features, model support, strengths, weaknesses. Auto-updated weekly for a full year after purchase.

9. Quarterly updates for one year

New kits, new rules, new prompts, new tools. Bought once, updated four times minimum. Emailed to every buyer.

10. Priority Discord (unlocks at 100+ buyers)

Request a kit for your stack, share workflows, get help debugging AI IDE setups.

What it's not

• Not a course. No videos, no chapters, no "modules to complete." It's a reference pack.
• Not for beginners learning to code. Assumes you already ship code, want AI tools to work better.
• Not sold via subscription. Buy once. Yours forever. No recurring charges.

Who this is for

• Solo devs and small teams using Cursor, Claude Code, Windsurf, or Copilot
• Engineers switching between AI IDEs and tired of re-writing rules
• Tech leads who want their whole team on the same rules baseline
• Anyone who's ever thought "there has to be a better rules file for this"

Why buy vs. use the free tools?

Our free .cursorrules generator and CLAUDE.md generator get you a decent starting file for your stack.

The paid pack gives you what you can't get anywhere free:

• Full AI Coding Kits per stack — bundled setups combining rules + slash commands + MCP configs + prompt recipes + anti-hallucination tests. No one else ships this bundled.
• Anti-hallucination test suites — verify your AI setup isn't inventing fake APIs, packages, or config fields. Included per-stack.
• Multi-step prompt recipes — chained workflows for real problems (diagnose slow SSR, safe async migrations, N+1 hunts), not isolated prompts.
• Custom slash commands for Claude Code — /new-route, /audit-security, /optimize-query, /review-pr — configured per stack, ready to drop in.
• Quarterly updates for a year — new tool versions, new kits, new recipes. Bought once.

FAQ

When does it launch?

This month. Waitlist gets 24h early access + locked-in €15 forever.

How is it delivered?

After purchase you get an email with the download (PDF + zip of raw files) and access to the Google Sheet + Notion. Everything within 60 seconds of buying.

Do I have to use Cursor or Claude Code?

The rules files are for Cursor. The CLAUDE.md files are for Claude Code. The prompts work in any AI chat (Cursor, Claude Code, Copilot, Windsurf, ChatGPT, Claude.ai). You get value from any of these tools.

What if the AI IDE ecosystem changes?

Quarterly updates for a full year cover new tools, new features, model changes. Bought once, updated four times minimum.

Refund policy?

Full refund within 30 days, no questions. If you find better rules files elsewhere, keep them, get your money back.

Can my team use it?

Team license (up to 10 devs) is €79. Contact hello@devtoolsniff.com after purchase to upgrade.