{
  "$type": "site.standard.document",
  "bskyPostRef": {
    "cid": "bafyreidjkxk2ial5z6re7bkvesnwv4mb55shfcneq35ip5ez2qukheh3i4",
    "uri": "at://did:plc:25rdn5elo5izoxrmtis34zuk/app.bsky.feed.post/3mos3eua4zvt2"
  },
  "coverImage": {
    "$type": "blob",
    "ref": {
      "$link": "bafkreiga7viv5soxpkl6qunlrnfql7xmfs3jmccjzz3rbdh7wriecf5wxq"
    },
    "mimeType": "image/webp",
    "size": 66698
  },
  "path": "/promptmaster/what-is-claudemd-a-practical-guide-to-configuring-claude-code-2eb1",
  "publishedAt": "2026-06-21T09:36:53.000Z",
  "site": "https://dev.to",
  "tags": [
    "ai",
    "aitools",
    "productivity",
    "tutorial",
    "CLAUDE.md Quick-Start Cheat Sheet",
    "CLAUDE.md: The Complete Claude Code Configuration Guide"
  ],
  "textContent": "If you use Claude Code, there is one file that quietly shapes every session: CLAUDE.md. Most developers either do not have one or have one that works against them. Here is what it actually is, in plain terms.\n\n##  The file Claude reads every session\n\nCLAUDE.md is a markdown file that Claude Code reads at the start of every conversation. Think of it as your project's constitution — the source of truth for how your specific repository works. Because Claude reads it every time, you stop re-explaining your stack, your conventions, and your commands on every task.\n\n##  Why it exists\n\nWithout a CLAUDE.md, every session starts cold. Claude can read your code, but it cannot infer the things that live outside the code: that you are on Next.js 15 and not 14, that a directory is generated and must never be edited, that your team has a particular commit style. You end up explaining these again and again, slightly differently each time, so the output drifts. CLAUDE.md captures that knowledge once, somewhere Claude always sees it.\n\n##  Where it lives, and how to start\n\nPut CLAUDE.md in the root of your project. You do not have to write it from a blank page — the `/init` command analyses your codebase and generates a starter, detecting your build tools, test framework, and existing patterns:\n\n\n\n    $ claude\n    > /init\n\n\nTreat the result as a foundation, not a finished product. The real value comes from refining it as you learn what Claude gets wrong without guidance.\n\n##  What belongs in it\n\nA good CLAUDE.md is short and specific:\n\n  * A one-line stack description, **with versions** — Claude will not guess Next.js 15 over 14\n  * A directory map — the top-level layout and what each part holds\n  * The build and test commands\n  * The conventions a newcomer could not infer from the code\n  * A \"do not touch\" section — generated files, migrations, protected paths\n\n\n\nHere is a compact example:\n\n\n\n    # Project: Acme Dashboard\n    Next.js 15 (App Router), TypeScript, Drizzle ORM, Vitest.\n\n    ## Structure\n    src/app/        # routes and pages\n    db/migrations/  # generated - never hand-edit\n\n    ## Commands\n    Build:  npm run build\n    Test:   npm run test\n\n    ## Do not touch\n    db/migrations/ is generated. Never edit by hand.\n\n\n##  Why it is the highest-leverage file\n\nBecause CLAUDE.md loads on every single session, its quality compounds. A precise file pays off thousands of times over a project's life — every task starts from a correct understanding. A bloated one taxes every interaction. Few files in your repo have this much leverage, which is why it is worth getting right before anything else.\n\n##  The bottom line\n\nCLAUDE.md is a small, durable investment: write your project's real context once, keep it lean, and every session starts from a correct picture. It is also the foundation the rest of Claude Code's configuration — commands, hooks, subagents, skills — builds on.\n\n**Free starter:** The format, a complete annotated example, and the one-line test are all on a free cheat sheet: CLAUDE.md Quick-Start Cheat Sheet\n\n**Go deeper:** The full guide covers the entire configuration stack — hooks, subagents, commands, skills and plugins — with real-world walkthroughs and a 30-day plan: CLAUDE.md: The Complete Claude Code Configuration Guide\n\nWhat does your CLAUDE.md look like right now — lean and sharp, or a bit of a dumping ground? Curious to hear in the comments.",
  "title": "What Is CLAUDE.md? A Practical Guide to Configuring Claude Code"
}