“LLMs are exceptionally good at looping until they meet specific goals... Don't tell it what to do, give it success criteria and watch it go — Andrej Karpathy, January 2026”
You know that feeling when an AI assistant writes code that works—but leaves behind unnecessary abstractions, dead code, and a structure only it understands? You accept the PR because it passes tests, then spend hours cleaning up. LLMs don't ask for clarification, they make assumptions, and they overbuild. Karpathy identified six specific failure modes: wrong assumptions, no confusion management, overcomplicating code, bloated abstractions, and dead code that never gets cleaned.
Think of it like a project manager for your AI coding assistant. You drop a 65-line CLAUDE.md file into your project root. Every time you ask Claude Code to do something, it reads these four rules first: understand before changing, keep it simple, make minimal changes, and define what 'done' looks like. The file doesn't add features—it shapes behavior. Like giving a junior dev a checklist: 'Before you code, explain what you're about to do and why.'
If you're using Claude Code and tired of cleaning up over-engineered AI commits, this is for you. Perfect for solo developers or small teams who want guardrails without heavyweight processes. Not useful if you're on Cursor, Copilot, or other AI tools—this only works with Claude Code. Also not a fit if you've already trained yourself to give better prompts; the file automates what you might already be doing manually.
Yes, if you use Claude Code and feel the pain of over-engineered AI suggestions. The principles come directly from Karpathy's real workflow shift from 20% to 80% agent coding—he's not theorizing, he's sharing what actually works. The 9.4k stars and HN discussion prove real developers are finding value. But understand what you're getting: a behavior-shaping file, not a new tool. If Claude Code's built-in Plan mode already works for you, this adds minimal overhead. Start with the examples in EXAMPLES.md to see if the style matches how you think.
Deep-dive insight, Easy and Pro modes, plus action playbooks — the full breakdown is one tap away.