What is ai-rules CLAUDE.md?

A project instruction document for Neon’s AI development rules. It describes Markdown guidance files and a Claude Code plugin for developers using Neon databases with AI coding assistants.

Use it when navigating or maintaining the archived Neon AI rules repository and its context files or plugin components.

It gives an agent background on the repository's documentation, rules and plugin structure. The document also notes that the repository has been archived and its content moved elsewhere.

How neondatabase/ai-rules configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to neondatabase/ai-rules. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/neondatabase/ai-rules/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/neondatabase/ai-rules

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/neondatabase/ai-rules/claude-md/github.svg)](https://agentmods.dev/instructions/neondatabase/ai-rules/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/neondatabase/ai-rules/claude-md"><img src="https://agentmods.dev/badge/instructions/neondatabase/ai-rules/claude-md/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.

Your own site · 80×15

<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="Reviewed on agentmods" width="80" height="20"></a>

Per session 2,942 This file is loaded in full into every session.

When invoked 2,942 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.02942	$0.02942
Opus 5.5	$0.01177	$0.01177
Sonnet 5.5	$0.00588	$0.00588
Haiku 4.5	$0.00294	$0.00294

Measured 2mo ago against content hash bdbc0b0345de, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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 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.

CLAUDE.md · 269 lines

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 (.mdc files): 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

Read the full file on GitHub · 269 lines

Changes

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 · 269 lines · 2,942 tokens per session scan A bdbc0b0345de

Subscribe to this mod's changes

ai-rules CLAUDE.md is an instructions file published in the GitHub repository neondatabase/ai-rules (86 stars, last pushed 5mo ago), licensed MIT. It adds 2,942 tokens to every session, about $0.0118 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 2026-08-30.

ai-rules CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
ai-rules CLAUDE.mdneondatabase/ai-rules	Instructions file	86	5mo ago	MIT	A	2,942	Claude Code
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ai-rules: Instructions file for Claude Code