Do you need to know how to code to use a CLAUDE.md file?

No. A CLAUDE.md file is plain text. If you can write a note, you can write one. You describe yourself, your projects, and how you like to work in normal sentences, then paste it into a Claude Project's instructions.

Does a CLAUDE.md file work with ChatGPT?

The CLAUDE.md convention comes from Anthropic's Claude, where the file is read automatically. The same principle — giving the AI a persistent context file — works with other assistants too, though the exact setup differs. Nap Stack's templates are written for Claude (claude.ai).

Does it cost anything?

The file itself is free to write, and Nap Stack offers a free CLAUDE.md template. To use Claude seriously you'll want Claude Pro, about EUR 20 per month paid to Anthropic; the free Claude tier works for testing.

The CLAUDE.md File, Explained

What Is a CLAUDE.md File?

Q: What is a CLAUDE.md file?

A CLAUDE.md file is a plain-text Markdown file that you give an AI assistant (such as Claude) so it remembers who you are, what you're building, and your preferences across every conversation. Instead of re-explaining your context each session, the AI reads the file first and starts already knowing you. It is the same idea as a configuration or 'system' file, written in plain language anyone can edit.

Last updated: June 23, 2026

Short answer: A CLAUDE.md file is a plain-text file you give an AI assistant (like Claude) so it remembers who you are, what you're building, and your preferences across every conversation. Instead of re-explaining your context each session, the AI reads the file first — so it starts already knowing you, like a co-founder who picks up where you left off. For a parent building in short nap windows, it's the difference between spending the first 20 minutes re-explaining yourself and starting at minute one.

What it actually is

"CLAUDE.md" is just a file name. The .md means Markdown — plain text with light formatting. The file holds the context an AI would otherwise forget the moment you close the chat: your name, your situation, the projects you're working on, how you like things done.

You write it once, in normal sentences. No code. Then the AI reads it at the start of every conversation, so it never starts from zero. Think of it as a one-page briefing you hand a new collaborator — except you only have to hand it over once.

Why it matters when your time is fragmented

Generic AI chats start fresh every time. You explain your project. You explain your context. You explain what you decided last session. By the time the AI is caught up, your window is half gone — or the baby's awake.

A CLAUDE.md file removes that tax. The AI opens already knowing the thread, so a 45-minute window goes to the actual work instead of the re-onboarding. Across a week of short sessions, that recovered time is the difference between a project that moves and one that just gets re-explained.

How to set one up (about 30 minutes)

Open a text editor — Notes, TextEdit, anything. No special tools.
Describe yourself and your constraints in plain sentences (e.g. "I work in 45-minute windows while my child naps").
List your current projects and where each one stands, so the AI can resume them.
Paste it into a Claude Project at claude.ai — put it in the Project's instructions so it loads automatically.
Start a new chat and ask what to work on. The context is already there.

What goes inside a CLAUDE.md file

Who you are — your situation, your working style, your hard limits on time.
What you're building — each project, its goal, its current state.
Preferences — how you want the AI to respond (concise, no fluff, lists over essays).
Anything it keeps getting wrong — correct it once in the file and it stops.

Get the free CLAUDE.md template

The exact entry-point file, about 80% pre-filled. Change the lines marked with arrows, paste into Claude, done.

Start with the 2-minute quiz

Common questions

Do you need to know how to code?

No. It's plain text. If you can write a note, you can write a CLAUDE.md file.

Does it work with ChatGPT?

The CLAUDE.md convention comes from Claude, where the file is read automatically. The same principle — a persistent context file — applies to other assistants, though the setup differs. Nap Stack's templates are written for Claude (claude.ai).

What does it cost?

The file is free to write, and the Nap Stack template is free. For serious use you'll want Claude Pro — about €20/month, paid to Anthropic, separate from anything here. The free Claude tier works for testing.

Is this just a prompt pack?

No. A prompt pack is a list of things to type. A CLAUDE.md file is a configuration file the AI reads on its own every session — the difference between handing someone a script and giving them a memory.

This approach is what Nap Stack is built on. The founder, Rachel, built the nap-stack.com website, a family meal-plan app, and a five-email welcome sequence this way — all in nap windows. That's not a promise about what you'll make; it's proof the windows are enough to make something real in.

Want the actual file? Free CLAUDE.md template.

The entry-point file from the full Nap Stack System — pre-filled, yours to read and edit. Free, instant, no upsell.