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Give Claude these 5 files before you build

Each Claude Code session starts with a fresh context window. These five files hold your decisions, so Claude stops guessing and stops forgetting what you decided yesterday.

Files5 templates, copy and fill in
Read every sessionCLAUDE.md, loaded at the start
Works inClaude Code

Checked on 15 Oct 2026. Tools change fast, so the official page always wins if it says something different.

The 5 templates

1. PRD: what you're building

What you're building, who it's for, and every feature.

PRD.md
# PRD
What we're building: [one sentence]
Who it's for: [the user]
The problem it solves: [one sentence]
Features:
- [feature 1]
- [feature 2]
- [feature 3]
Not building yet: [things to leave out for now]

2. Design system: how it looks

Colors, fonts, spacing and buttons, so every screen matches.

design-system.md
# Design system
Colors: background [color], text [color], main color [color]
Fonts: headings [font], body text [font]
Spacing: small [size], medium [size], large [size]
Buttons: [shape], [color], [what happens on hover]

3. Architecture: how it works

The tech stack and how data moves.

architecture.md
# Architecture
Tech stack: [frontend], [backend], [database]
How data moves: [the user does X, the app saves Y, then shows Z]
Outside services: [sign-in], [payments], [email]

4. CLAUDE.md: the rules Claude reads first

Claude Code loads CLAUDE.md at the start of every session. Name it exactly CLAUDE.md.

CLAUDE.md
# CLAUDE.md
Before you start, read PRD.md, design-system.md, architecture.md and tasks.md.
Rules:
- Follow the design system.
- Do one task at a time from tasks.md.
- Tick off a task only when it works.
- Ask me before you add a new tool or change the plan.

5. Task list: small steps

Small steps Claude checks off one by one.

tasks.md
# Tasks
- [ ] [small task 1]
- [ ] [small task 2]
- [ ] [small task 3]

Put them in your project folder

Save all five in your project folder, then start Claude Code there. When you change your mind about something, update the file.

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