A single, roughly 65-line CLAUDE.md file built around Andrej Karpathy's observations of common LLM coding failure patterns has spread quickly among users of agentic development tools such as Claude Code, drawing more than 200,000 combined stars on GitHub.
January 2026 · CLAUDE.md
One Tiny File, Four Rules — and a Viral Fix for AI Coding
A single CLAUDE.md distilling Andrej Karpathy's observations of LLM coding failures into four behavioral rules is spreading fast across GitHub — a lightweight way to make Claude Code and Cursor act like a cautious senior engineer.
185k
GitHub stars at time of viewing
19k+
Forks, reflecting rapid adoption
4
Behavioral rules in one file (MIT)
The Four Behavioral Principles
1 · Think Before Coding
Make assumptions explicit; ask for clarification when confused.
2 · Simplicity First
Write only the minimal code requested; avoid over-abstraction.
3 · Surgical Changes
Touch only what the request needs; don't rewrite unrelated code.
4 · Goal-Driven Execution
Define success criteria; loop while verifying via tests.
The failure modes it targets
Drawn from extensive coding with Claude, these are the behaviors developers wanted to curb:
Silent assumptions
Pressing ahead amid confusion
Over-engineering
Rewriting unrelated code
Why developers like it
Less over-complication, fewer unnecessary diffs
Clarifying questions appear before work begins
Cleaner pull requests
Enforces cautious, senior-engineer behavior
The tradeoffs
Bias toward caution may slow trivial tasks
Repo advises relaxing strict application on simple jobs
Doesn't cover every LLM failure mode
Best merged with project-specific instructions
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