Prompting & Config
Karpathy Claude.md File
Andrej Karpathy's Claude.md file explained, with the patterns you can lift into your own.
Published May 2026
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Andrej Karpathy posted about failure modes in agentic coding on January 26, 2026 after shifting to 80 percent agent-driven work. Forrest Chang packaged those failure modes into a 65-line CLAUDE.md the next day. Extended testing across 30 codebases took the mistake rate from 41 percent down to 3 percent.
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