The best CLAUDE.md rules are hiding in your chat history.

Description and use

<p>Quick question. What's the one sentence you've typed to your AI more than any other?</p> <p>Not the one you <em>think</em> you type. The one you actually type.</p> <p>I didn't know mine either. So I went back through three months of my own Claude Code history and counted. It was "keep it simple." <strong>42 times</strong>, across 38 different sessions. And that rule was written nowhere my AI could read it.</p> <blockquote> <p>Every correction you type and don't write down dies with the session.</p> </blockquote> <p>If you use Claude Code, Cursor or Codex every day, you have your own "keep i

Problem

<p>Quick question. What's the one sentence you've typed to your AI more than any other?</p> <p>Not the one you <em>think</em> you type. The one you actually type.</p> <p>I didn't know mine either. So I went back through three months of my own Claude Code history and counted. It was "keep it simple." <strong>42 times</strong>, across 38 different sessions. And that rule was written nowhere my AI could read it.</p> <blockquote> <p>Every correction you type and don't write down dies with the session.</p> </blockquote> <p>If you use Claude Code, Cursor or Codex every day, you have your own "keep i

Outcome

<p>Quick question. What's the one sentence you've typed to your AI more than any other?</p> <p>Not the one you <em>think</em> you type. The one you actually type.</p> <p>I didn't know mine either. So I went back through three months of my own Claude Code history and counted. It was "keep it simple." <strong>42 times</strong>, across 38 different sessions. And that rule was written nowhere my AI could read it.</p> <blockquote> <p>Every correction you type and don't write down dies with the session.</p> </blockquote> <p>If you use Claude Code, Cursor or Codex every day, you have your own "keep i

Evidence

The best CLAUDE.md rules are hiding in your chat history.

Source