Claude Code has a project-level configuration system most users ignore. The .claude directory, CLAUDE.md, and CLAUDE.local.md files let you encode persistent context, behavioral rules, and personal preferences directly into your workflow, so the model stops forgetting who you are and what you need.
The piece focuses on how Boris structures CLAUDE.md specifically, which is the detail worth your attention. Generic advice about system prompts is everywhere. Seeing an actual practitioner's file, with real decisions about what to include and why, is not.
If you use Claude Code daily and still rely on one-off prompting, this is the gap in your setup. The configuration layer exists. Most people are not using it.
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