Claude Code reads your CLAUDE.md at the start of every session. A long one rides along even when you are doing something unrelated, and the docs say longer files use more context and get followed less.
Here's how to see it, split it, and keep it short.
Step 1: see what is taking space
- In Claude Code, type /context. It shows what is using your context window.
- Count your CLAUDE.md lines: ask Claude "how many lines is my CLAUDE.md?"
- The docs' target is under 200 lines per file.
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