Why the Claude Code ‘CLAUDE.md’ Ruleset Earned Over 91K Stars

What is the “plugin”?

The core of the repository is a single CLAUDE.md file placed at the project root. Claude Code reads this file as a long‑term instruction for the model, effectively a project‑level behavior configuration rather than a VSIX or npm package.

Why it has >91 K stars

Problem identification : It targets common LLM coding pitfalls—unwanted feature additions, accidental refactoring of neighboring files, and over‑confidence when uncertain.

Appropriate granularity : Instead of hundreds of fine‑grained rules, it offers four main principles with actionable verification sentences that are easy to remember and apply.

Toolchain alignment : The file lives exactly where Claude Code expects it, requiring no new DSL or learning curve.

Four core principles

Think Before Coding : Do not assume, clarify ambiguities, highlight simpler solutions, and pause to ask when confused.

Simplicity First : Write the minimal code that solves the problem; avoid speculative features, unnecessary abstractions, and overly generic configurations.

Surgical Changes : Modify only what is needed, keep existing style, clean up dead code you introduce, and avoid altering others’ code unless explicitly required.

Goal‑Driven Execution : Turn requirements into verifiable goals; add tests for invalid input, reproduce bugs before fixing, and break multi‑step tasks into short plans with acceptance criteria.

The file notes a trade‑off: the rules favor caution over speed, leaving room for developers to relax them on trivial tasks.

How to use it in a real project (minimal steps)

Open the root of your code repository.

If a CLAUDE.md already exists, merge the rules from this repository, adjusting or removing sections as needed to avoid conflicts.

If no CLAUDE.md is present, adopt this file as the initial draft and then add your team‑specific naming, branching, and testing conventions.

Commit the file so the entire collaboration chain shares the same model‑behavior baseline.

Practical tip

The file reduces unnecessary model autonomy but does not replace code review or testing; embedding concrete acceptance criteria from principle 4 into team habits often yields better results than lengthy prose.

Who it is not for and costs

Teams that prioritize extreme speed and are willing to clean up messes later may find the rules slowing down rapid “one‑shot” development.

Those who rely on AI as a free‑form inspiration engine may consider the approach too “engineer‑ish.”

Teams without English reading ability need to translate the file; semantic alignment matters more than literal translation.

Repository link

Repository: https://github.com/forrestchang/andrej-karpathy-skills

Raw CLAUDE.md: https://raw.githubusercontent.com/forrestchang/andrej-karpathy-skills/main/CLAUDE.md