AIFIRST
Claude Code
r/AskVibecoders
Karpathy's 12-rule CLAUDE.md cuts agent mistake rate to 3%
TLDR
Karpathy expanded his 4-rule CLAUDE.md to 12 rules over 30 codebases, dropping mistake rates from 41% to 3%. New rules target silent pattern blending, read-before-write discipline and checkpointing.