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/proSamik/starterkit-nextjs-polar-betterauth-postgresWrote 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/rules/prosamik/starterkit-nextjs-polar-betterauth-postgres/project-libraries-and-structure)<a href="https://agentmods.dev/rules/prosamik/starterkit-nextjs-polar-betterauth-postgres/project-libraries-and-structure"><img src="https://agentmods.dev/badge/rules/prosamik/starterkit-nextjs-polar-betterauth-postgres/project-libraries-and-structure/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/rules/prosamik/starterkit-nextjs-polar-betterauth-postgres/project-libraries-and-structure"><img src="https://agentmods.dev/badge/rules/prosamik/starterkit-nextjs-polar-betterauth-postgres/project-libraries-and-structure.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 | $0.03709 | $0.03709 |
| Opus 5.5 | $0.01484 | $0.01484 |
| Sonnet 5.5 | $0.00742 | $0.00742 |
| Haiku 4.5 | $0.00371 | $0.00371 |
Grade A, and why
project-libraries-and-structure 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 2mo 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- project-libraries-and-structure — 91% identical, 29 lines differ
How it starts
The opening of the file, as written. The whole thing — 350 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Polar SaaS Kit - Project Documentation
Always update this whenever something is updated or added new
Project Overview
Polar SaaS Kit is a production-ready Next.js starter for building modern SaaS applications with payments, authentication, and premium features. Built with Next.js 15, Better Auth, Polar.sh payments, and PostgreSQL with a comprehensive theming system.
Key Libraries and Dependencies
Core Framework & Runtime
- Next.js 15.3.2 - React framework with App Router, used for SSR and routing
- React 19.1.0 & React DOM 19.1.0 - Latest React with concurrent features
- TypeScript 5.8.3 - Type-safe development with strict configuration
- Node.js >=18 - Runtime environment requirement
Authentication & Authorization
- better-auth 1.2.8 - Modern authentication library with session management
- bcrypt-ts 7.0.0 - Password hashing for credential authentication
- Polar.sh plugin - Automatic customer creation and linking
- Social providers: GitHub and Google OAuth integration
- Session management with 7-day expiration and 1-day update cycle
Database & ORM
- drizzle-orm 0.41.0 - Type-safe ORM with excellent TypeScript support
- drizzle-kit 0.30.6 - Migration and introspection tools
- pg 8.16.0 - PostgreSQL driver
- Database schemas in
src/lib/db/pg/schema.pg.ts
Payments & Billing
- Polar.sh - Payment processing and subscription management
- Automatic customer creation on signup
- Subscription and one-time payment support
- Webhook handling for payment updates
- Customer portal integration
UI Components & Styling
- @radix-ui/* - Accessible headless UI primitives (dialog, dropdown, etc.)
- tailwindcss 4.1.8 - Utility-first CSS framework
- tailwind-merge 3.3.0 - Utility for merging Tailwind classes
- class-variance-authority 0.7.1 - Component variant management
- lucide-react 0.486.0 - Icon library with 1000+ SVG icons
- framer-motion 12.15.0 - Animation library for smooth transitions
- 20+ custom themes - Complete theming system with CSS custom properties
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.
- 2mo ago First seen · 350 lines · 3,709 tokens per session scan A 0b978229aaf0
project-libraries-and-structure is a cursor rule published in the GitHub repository proSamik/starterkit-nextjs-polar-betterauth-postgres (5 stars, last pushed 1y ago), licensed MIT. It adds 3,709 tokens to every session, about $0.0148 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 2026-08-31.
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