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Complete Guide to Claude Code's CLAUDE.md

Source: ai.gopubby.com

TL;DR

This guide explains the CLAUDE.md file, a markdown config that Claude Code loads at every session start to guide its behavior on projects.
Files load from scopes like project root (`./CLAUDE.md`), user home (`~/.claude/CLAUDE.md`), or `.claude/rules/` directories, concatenated in tree order with local overrides.
Developers use it to set standards, commands, and rules that Claude can't infer from code, boosting consistency across sessions.[[1]](https://ai.gopubby.com/the-complete-guide-to-claude-code-claude-md-743d4cbac757)[[2]](https://code.claude.com/docs/en/memory)

The story at a glance

The article covers the CLAUDE.md file in Anthropic's Claude Code, a terminal-based AI coding agent launched in early 2025. It details how Claude Code reads these files to apply project rules, written by zhaozhiming for AI Advances in March 2026. This guide appeared amid growing use of agentic coding tools, as developers shared setups for better AI reliability. Official docs confirm CLAUDE.md as core for persistent instructions.[[1]](https://ai.gopubby.com/the-complete-guide-to-claude-code-claude-md-743d4cbac757)[[3]](https://code.claude.com/docs/en/overview)

Key points

Loading process: Claude scans from working directory up the tree for `CLAUDE.md` and `CLAUDE.local.md`, concatenates them (parents first), injects full content into context; subdir files load on-demand.[[2]](https://code.claude.com/docs/en/memory)
Scopes and paths: Org-wide (`/etc/claude-code/`), project (`./CLAUDE.md`), user (`~/.claude/`), local personal (`./CLAUDE.local.md`, gitignored); child files override parents.[[2]](https://code.claude.com/docs/en/memory)
Writing rules: Keep under 200 lines, use markdown structure, specific commands (e.g., "run `npm test`"), imports via `@path/to/file`, avoid contradictions or inferable info.[[4]](https://code.claude.com/docs/en/best-practices)
Modular rules: Store in `.claude/rules/.md` with YAML frontmatter for path-specific loading (e.g., `paths: ["src//.ts"]`); supports globs, symlinks.[[2]](https://code.claude.com/docs/en/memory)
Best practices: Run `/init` for starter file, emphasize key rules ("YOU MUST"), test adherence, pair with auto-memory for dynamic learnings like build commands.[[4]](https://code.claude.com/docs/en/best-practices)
Vs. auto-memory: CLAUDE.md is human-written/static for standards; auto-memory is Claude-generated/dynamic (first 25KB of `MEMORY.md`), both injected as context but not enforced.[[2]](https://code.claude.com/docs/en/memory)

Details and context

Claude Code works by reading the full codebase, planning in natural language, editing files, running git/tests/commands, and verifying changes via an agentic loop. CLAUDE.md prevents repeating instructions each session, covering non-obvious details like env quirks or repo etiquette that code alone doesn't reveal.[[3]](https://code.claude.com/docs/en/overview)

For large projects, split rules to avoid token bloat: use `@README` imports (nested up to 5 levels, user-approved) or path-glob files in `.claude/rules/`. Hooks complement by auto-running shell scripts (e.g., lint post-edit), while skills package commands like `/review-pr`.[[4]](https://code.claude.com/docs/en/best-practices)

Compared to tools like Cursor or Gemini CLI, CLAUDE.md mirrors `.cursorrules` but emphasizes layered scopes and on-demand loading for monorepos; it's not hard-enforced, so brevity ensures Claude follows it reliably.[[2]](https://code.claude.com/docs/en/memory)

Key quotes

"Keep them short (< 200 lines), specific, well-structured, and free of contradictions."[[2]](https://code.claude.com/docs/en/memory)

"See @README for overview and @package.json for npm commands."[[4]](https://code.claude.com/docs/en/best-practices) (example import syntax)

Why it matters

CLAUDE.md turns Claude Code from a forgetful assistant into a consistent team member, enforcing standards across sessions and teams for faster, error-free development. Developers save hours avoiding re-prompts; businesses gain reliable AI output in shared repos without custom training. Watch Anthropic's updates to MCP integrations or agent teams, as they could expand CLAUDE.md with dynamic overrides, though full enforcement remains unlikely.[[3]](https://code.claude.com/docs/en/overview)