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.
npx agentmods add instructions/neondatabase/ai-rules/claude-mdgit clone --depth 1 https://github.com/neondatabase/ai-rulesWrote 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/instructions/neondatabase/ai-rules/claude-md)<a href="https://agentmods.dev/instructions/neondatabase/ai-rules/claude-md"><img src="https://agentmods.dev/badge/instructions/neondatabase/ai-rules/claude-md.svg" alt="Measured on agentmods" 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 | $0.02942 | $0.02942 |
| Opus 5 | $0.01471 | $0.01471 |
| Sonnet 5 | $0.00588 | $0.00588 |
| Haiku 4.5 | $0.00294 | $0.00294 |
Grade A, and why
ai-rules CLAUDE.md 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 5d 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.
How it starts
The opening of the file, as written. The whole thing — 269 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Neon AI Rules - Project Documentation
Note: This repository has been archived. Content has moved to neondatabase/agent-skills.
Project Overview
This repository contains a comprehensive suite of AI-powered development tools for Neon, including:
- Context Rules (
.mdcfiles): Markdown Context files that guide AI systems - Claude Code Plugin: Full-featured plugin with guided skills and MCP server integration
- Neon SDK Rules: Guidelines for TypeScript and Python SDKs
The primary audience includes AI developers using Claude, Cursor, and other AI-powered code assistants who work with Neon databases.
Repository Structure
.
├── *.mdc # Context rule files (16 total)
├── .claude-plugin/
│ └── marketplace.json # Marketplace metadata
├── neon-plugin/ # Claude Code plugin
│ ├── .claude-plugin/
│ │ └── plugin.json # Plugin metadata
│ ├── .mcp.json # MCP server configuration
│ ├── evals/ # Skill evaluation tests
│ └── skills/ # Guided skills for Claude Code (6 total)
│ ├── add-neon-docs/ # Documentation reference installer
│ ├── neon-auth/ # Neon Auth integration
│ │ ├── guides/ # Setup guides (Next.js, React SPA)
│ │ └── templates/ # Auth client templates
│ ├── neon-drizzle/
│ │ ├── guides/ # Step-by-step workflow guides
│ │ ├── references/ # Technical reference docs
│ │ ├── scripts/ # Utility scripts
│ │ └── templates/ # Code templates
│ ├── neon-js/ # Full Neon JS SDK integration
│ │ ├── guides/ # Setup guides
│ │ └── templates/ # Client templates
│ ├── neon-serverless/
│ └── neon-toolkit/
├── references/ # Shared technical reference docs (16 files)
│ ├── code-generation-rules.md
│ ├── neon-auth-*.md # Auth-related references (11 files)
│ │ # Includes: common-mistakes, components, provider-config,
│ │ # setup (general, nextjs, nodejs, react-spa), troubleshooting,
│ │ # ui (general, nextjs, react-spa)
│ └── neon-js-*.md # Neon JS references (4 files)
│ # Includes: adapters, data-api, imports, theming
├── mcp-prompts/ # MCP prompt templates
├── .claude/
│ └── settings.local.json # Local Claude Code settings
├── .serena/ # Serena code intelligence cache
├── CHANGELOG.md # Version history and release notes
├── CONTRIBUTING.md # Contribution guidelines
├── LICENSE # MIT License
├── README.md # User-facing documentation
└── CLAUDE.md # This file
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.
- 5d ago First seen · 269 lines · 2,942 tokens per session scan A bdbc0b0345de
ai-rules CLAUDE.md is an instructions file published in the GitHub repository neondatabase/ai-rules (86 stars, last pushed 3mo ago), licensed MIT. It adds 2,942 tokens to every session, about $0.0147 per session on Opus 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 2026-08-30.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.