A single Markdown rules file can fix Claude Code’s worst habits
eyishazyer · x · 2026-07-22
A reply highlights a free trick for Claude Code: use a single Markdown file to fix its worst habits.
The post says power users can trim the model’s mistakes by giving it a compact rules file, rather than relying on bloated prompts. It also references Andrej Karpathy’s field notes, where he says he moved from roughly 80% manual coding to 80% agent coding in a couple of months, and describes common failure modes:
- models make wrong assumptions and keep going
- they overcomplicate simple fixes
- they quietly touch code they shouldn’t
The core message: better agentic coding comes from tighter constraints and simpler instructions, not just bigger prompts.
Related event: Open Source Project Turns Karpathy's Coding Tips into Claude Code Rules(3 posts)→
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