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CLAUDE.md + AGENTS.md 12-rule behavior file for Claude Code, Codex, Cursor, Hermes — drop-in, ~700 tokens, cuts AI coding mistakes ~40%→~3%

14
3
85% credibility
Found May 17, 2026 at 15 stars -- GitGems finds repos before they trend. Get early access to the next one.
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AI Analysis
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AI Summary

The Claude Code Pro Pack is a collection of behavior guidelines and reusable templates designed to improve how AI coding assistants work on software projects. It provides a 12-rule instruction file (CLAUDE.md) that you place in your project folder, which teaches your AI assistant to think before coding, keep changes small, avoid wasting time on dead ends, and report problems clearly instead of hiding them. The pack also includes optional skill templates for common workflows like planning features, systematic debugging, test-driven development, and code review. A companion GitHub Action automates installing these files into repositories. The project is designed to work with popular AI coding tools including Claude Code, Codex, Cursor, and similar assistants.

How It Works

1
🤖 You discover AI coding helpers make mistakes

You've been using an AI coding assistant but notice it sometimes goes off track, wastes time on wrong solutions, or breaks things that were working.

2
📋 You find a set of proven rules

Someone created a collection of 12 behavior rules that helps AI assistants stay focused, avoid common traps, and produce better results.

3
You add the rules to your project

You drop one file called CLAUDE.md into your project folder, and your AI assistant immediately starts following better habits.

4
You choose your path
📄
Just the rules

Copy the CLAUDE.md file and you're done — your assistant behaves better from the next conversation onward.

🛠️
Rules plus skill templates

Install additional templates for planning, testing, and reviewing code — giving your assistant step-by-step workflows.

5
🔄 Your assistant learns new habits

The AI now thinks before coding, keeps changes small and focused, and tells you when something goes wrong instead of hiding it.

🎉 Your projects run smoother

Fewer wasted cycles, fewer broken builds, and an AI assistant that actually understands what you want — working with you instead of against you.

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AI-Generated Review

What is claude-code-pro-pack?

This is a drop-in behavior file for AI coding assistants like Claude Code, Codex, Cursor, and Hermes. It contains 12 battle-tested rules that shape how an agent approaches coding tasks. The core claim: Karpathy's original 4 rules cut AI coding mistakes from roughly 40% down to 11%, and this pack's 12 rules allegedly push that further to around 3%. At roughly 700 tokens, it's designed to stay under the threshold where agent compliance drops. You copy one file into your project root and the agent picks it up on the next run. The pack also includes skill templates and example workflows for things like TDD loops and PR workflows.

Why is it gaining traction?

The hook is specificity. Instead of vague best practices, each rule cites a real failure mode it closes. The "think before coding" rule addresses assumption-stacking, "hard token budget" tackles the debugging spiral, and "fail visibly" targets silent partial failures. There's also a companion GitHub Action that automates installing the behavior file into repos, which makes team adoption straightforward. The comparison table showing how this differs from Anthropic's skills repo and addyosmani's agent-skills helps developers understand where it fits in their stack.

Who should use this?

Developers using Claude Code or Codex who want more predictable agent behavior. Teams managing multiple codebases where different agents need consistent guardrails. Anyone who's watched an AI assistant go off the rails mid-task and wished for better guardrails. Not a fit if you need domain-specific skills (check Anthropic's repo for that), but solid as a behavioral baseline layer.

Verdict

The 12-rule approach is pragmatic and the error-reduction claim is compelling, but with only 14 stars this is early-stage software. The 0.85% credibility score reflects that maturity. Worth trying on a side project to see if the rules actually change your agent's behavior, but don't bet production workflows on it yet. The MIT license makes experimentation low-risk.

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