writing-project-readme

Writing a Project README

Overview

A great README answers four questions for two audiences at once:

1. What is this? — non-engineers must understand in 30 seconds
2. How do I use/install it? — engineers must get unblocked
3. How does it fit together? — anyone evaluating must see architecture
4. Where do I go next? — links to deeper docs, never duplicate them

This skill is for full rewrites, not for small edits. Activate only when the user explicitly asks for a comprehensive README.

Invocation

This skill runs only when the user explicitly invokes it — e.g. /writing-project-readme or a clear request like "redo README.md based on the whole project". Do NOT auto-apply when:

• Editing a single section, fixing a link, or tweaking badges → use Edit directly
• Generating CHANGELOG, API reference, or ADRs → wrong artifact
• The existing README already covers the four audience questions → propose a tweak, not a rewrite

If you are reading this skill without an explicit invocation, stop and ask the user whether a full rewrite is intended.

Core Principle

Top third is for non-engineers. Bottom two-thirds is for engineers. Setup details live in a separate file (DEVELOPMENT.md, CONTRIBUTING.md, etc.) — the README links to them, never copies them.

If a non-engineer cannot read the first three sections and explain what the product does, the README has failed regardless of how complete the technical sections are.

Workflow

digraph readme_flow {
    "Confirm scope" [shape=diamond];
    "Parallel discovery (3 agents)" [shape=box];
    "Clarify open choices with user" [shape=box];
    "Draft README following the template" [shape=box];
    "Verify links & rendering" [shape=box];

    "Confirm scope" -> "Parallel discovery (3 agents)";
    "Parallel discovery (3 agents)" -> "Clarify open choices with user";
    "Clarify open choices with user" -> "Draft README following the template";
    "Draft README following the template" -> "Verify links & rendering";
}

1. Confirm scope

Before exploring, confirm:

• Does a setup/dev-environment doc already exist? (If yes, link to it. Never copy setup steps into the README.)
• Is the project public/open-source or internal? (Adjust tone, license, contact section.)
• Are there download/store links, badges, or visual identity to feature?

2. Parallel discovery (3 Explore subagents max)

Send a single message with three Explore agents in parallel covering:

Agent	Scope
Backend / server	Models, controllers, services, routes, commands, configs, jobs, external API integrations
Frontend / client	Pages/screens, components, layouts, build config, design system, PWA/native shell
Business domain & identity	App name/description/keywords from env or manifest, target user, store URLs, internal jargon, key migrations, dependency analysis to infer features

Each agent should return structured tables and lists, not prose. Cap each section at 5–10 lines. Skip storytelling.

Prompt templates

Hand each Explore agent one of these verbatim — the format is part of the requirement.

Backend / server agent:

Read this project and report the backend surface as compact tables. No prose.

Look in (whichever apply): app/, src/, server/, api/, routes/, jobs/, config/, migrations/, db/.

Report exactly these tables, 5–10 rows each:
1. Models — Name | Role | Key fields
2. Routes / endpoints — Method | Path | Handler | One-line purpose
3. Background jobs / queues — Name | Trigger | Purpose
4. External integrations — Service | Purpose | Where called
5. Datastore(s) — Engine | Used for

If a table has no entries, write "— none —".

Frontend / client agent:

Read this project and report the frontend surface as compact tables. No prose.

Look in (whichever apply): apps/, web/, src/, app/, pages/, components/, layouts/, design-system/, public/, package.json, build config files.

Report exactly these tables, 5–10 rows each:
1. Entry points / routes — Path | Component | Purpose
2. Top-level layouts — Name | Where used
3. Design system / shared components — Name | Role
4. Build & tooling — Tool | Purpose (bundler, framework, CSS, testing)
5. Platforms shipped — Web / iOS / Android / Desktop / CLI | Status

If a table has no entries, write "— none —".

Business domain & identity agent:

Read this project and report the product identity as compact tables. No prose.

Look in: README, package.json, manifest files (app.json, capacitor.config.*, Info.plist, AndroidManifest.xml), .env.example, docs/, marketing/, store-listing/.

Report exactly:
1. Product identity — Name | Tagline | Target user (one line each)
2. Distribution — Platform | Link or "internal" | Status
3. Core features inferred from code/deps — Feature | Evidence (file or dep)
4. Internal jargon / domain terms — Term | Definition
5. Compliance / standards mentioned — Standard | Where (filename or doc)

If a table has no entries, write "— none —".

3. Clarify open choices with the user

After discovery, ask at most 3 questions via the user-question tool. Default recommendations:

Question	Recommended default
Architecture diagram format	Mermaid (renders on GitHub, scannable for non-engineers)
Tech-stack badges	Include 4–6 core badges (language, framework, key libraries)
Jargon level in feature descriptions	Non-engineer prose first, technology in parentheses: 처방약 자동 불러오기 (연동: …)

Avoid open-ended "any preferences?" prompts — present concrete options with previews.

4. Draft using the template (below)

Follow the section order strictly. The order itself does work — front-loading non-engineer content is the whole point.

5. Verify

• Every internal link resolves (relative paths exist)
• Mermaid blocks render in a GitHub preview
• Tables align under monospace; no broken pipes
• Zero emojis (unless the user explicitly requested them)
• Setup commands shown are a 3–5 line teaser, with a link to the full setup doc

README Template

전체 템플릿은 template.md 참고. 섹션 순서가 룰의 핵심이므로 임의 변경 금지 — 상단 1/3은 비개발자, 하단 2/3은 개발자.

Adapting to Project Type

The template assumes a service app. Adjust before drafting:

Project type	Required sections	Skip / adapt
Service app (web/mobile)	What / Who / Features / Architecture / Setup	—
Library / SDK	What / Install / Quick example / API summary	"User journey", "Platforms"
CLI tool	What / Install / Commands / Examples	Architecture diagram (보통 과함)
Plugin / skill marketplace	What / 목록 테이블 / Install per item / Contributing	"User journey", ERD
Monorepo	Top-level: What / Packages 표 / Architecture. 각 패키지는 자체 README.	단일 Tech stack — 패키지별로 분산

This project (agent-skills) is the plugin / skill marketplace case — its README.md is a working reference layout.

Writing Rules

• No emojis unless the user explicitly opts in.
• No HTML if Markdown alternatives exist. Tables > nested HTML divs.
• Mermaid > ASCII > image for diagrams. Mermaid renders on GitHub and stays diffable.
• Tables for any 3+ parallel items. Bullet lists become unscannable past 5 lines.
• Code fences must specify a language (bash, text, mermaid, php, ts, …) for syntax highlighting and lint compliance.
• Blank lines around headings, lists, tables, fenced blocks. Many Markdown linters flag missing ones.
• Non-engineer phrasing first, jargon in parentheses. Example: Prescription auto-import (via insurance-claims API).
• One verb per feature row. Verbs reveal value; nouns hide it.
• Don't restate setup. Link to the dev guide. The README is the front door, not the manual.

Language & Localization

Audience	Pattern
국내 사용자 중심	한국어 우선, 영어 보조 (코드/명령어만 영어)
글로벌 OSS	영어 단일
한국 + 해외 동시	섹션 라벨 병기 — 설치 / Installation, 목차 / Table of Contents

When writing Korean copy, follow the ux-writing-korean skill. 핵심 규칙:

• 캐주얼 경어 (-요체), 능동형, 긍정형
• 명사 조합 회피 — 사용자 등록 처리 → 사용자를 등록해요
• 이모지는 사용자가 명시적으로 요청했을 때만

This project's own README.md is a working example of the bilingual pattern.

Concrete Examples

Opening section

Bad — framework-first, no user value:

# Awesome Project

A Laravel 11 application using Inertia.js, Tailwind CSS, and PostgreSQL.

Good — user value first, stack as supporting metadata:

# Awesome Project

> **약을 깜빡해도 괜찮은 복약 관리 앱**
> 처방전을 사진 한 장으로 등록하면, 시간 맞춰 알려드려요.

PHP · Laravel · Inertia · PostgreSQL

Feature list

Bad — prose buries the value:

The application allows users to register, manage their medication schedules,
receive notifications, share with family members, and view adherence reports.

Good — table with verb-first rows, 한국어/영어 병기:

| 기능             | 설명                                            |
| ---------------- | ----------------------------------------------- |
| 처방전 자동 등록 | 사진 한 장으로 약·복약 시간 입력 (OCR API 연동) |
| 복약 알림        | 시간대별 푸시 알림 + 잠금화면 위젯              |
| 가족 공유        | 보호자가 복약 여부를 실시간으로 확인            |
| 복약 리포트      | 주/월 단위 복용률, PDF 내보내기                 |

Architecture diagram

Bad — single blob, 20+ nodes, unreadable:

flowchart LR
  A[Mobile] --> B[API Gateway] --> C[Auth] --> D[User] --> E[Prescription] --> F[OCR Worker] --> G[(Postgres)]
  E --> H[Notification] --> I[FCM] --> J[APNs] --> K[Family] --> L[Reports] --> M[PDF] --> N[(S3)]
  D --> O[Profile] --> P[Settings] --> Q[Billing] --> R[Stripe]

Good — split into user journey + system, each ≤12 nodes:

flowchart LR
  Signup --> Onboarding --> 처방전등록 --> 복약알림 --> 꾸준한복약

flowchart LR
  Mobile --> API
  API --> Auth
  API --> Prescription --> OCR
  API --> Notification --> FCM
  API -.-> Postgres
  OCR -.-> S3

Common Mistakes

Mistake	Fix
Opening with "Installation" before the product is explained	Move What/Who/Features above any setup
Burying app name behind technical framing ("A Laravel app for …")	Lead with what the user gets, not the framework
Copying every dev-setup command into the README	Show 3–5 line teaser + link to the dedicated doc
Dense paragraphs of feature descriptions	Convert to tables; one row per feature
Mermaid diagram with 20+ nodes	Split into two diagrams (user journey vs. system) or simplify
Badges for every dependency	Cap at 4–6 — only what defines the project
Single "Tech stack" list with 40 items	Group by layer in a table
**\text`**` mixing bold + code unnecessarily	Pick one. Code for identifiers, bold for emphasis
ASCII art trees in serif preview	Use a fenced text block so it renders monospace
Stale links to renamed files	Re-verify every relative link after writing

Rationalization Table

Excuses you may catch yourself making, and the correct response:

Excuse	Reality
"유저가 기술자라 jargon 써도 됨"	비개발자 한 명이라도 읽는다고 가정. 첫 세 섹션은 평이한 언어로.
"셋업이 3줄이라 그냥 README에 넣자"	다음 사람이 또 복사함. 별도 파일이 없으면 새로 만들고, 있으면 링크만.
"이모지 하나만 — 분위기 살리기용"	사용자가 명시적으로 요청하지 않았으면 0개.
"다이어그램 노드가 20개여도 정확한 게 우선"	12개 넘으면 안 읽힘. 둘로 쪼개거나 단순화.
"기존 README가 짧으니 새로 쓰자"	tweak 요청이면 풀 재작성 금지. When-Not-to-use 적용.
"프레임워크 이름이 곧 정체성"	도구가 아닌 사용자 가치를 첫 문장에. 스택은 뱃지/Tech stack 섹션으로.
"한국어 README라 ux-writing-korean까지는 과함"	톤이 어긋나면 가독성이 깨짐. 5분이면 핵심 규칙 확인 가능.

Red Flags — STOP and Reconsider

• You are about to paste setup commands instead of linking → Stop, link to dev doc.
• You are writing your fifth paragraph before any heading → Stop, convert to a table.
• A non-engineer reading the first screen still can't say what the product does → Stop, rewrite the top section.
• Diagram has more than ~12 nodes → Stop, split or simplify.
• You added an emoji "for warmth" → Stop, remove it unless the user asked.

When Not To Use This Skill

• Adding one badge or one section to an existing README → just edit
• Generating a CHANGELOG, RELEASE_NOTES, or API reference → different artifact
• Writing internal architecture decision records → use ADR conventions
• The project already has a good README and the user wants a tweak → don't rewrite

Discovery Checklist Before Writing

• Confirmed full rewrite is wanted (not a tweak)
• Located existing dev/setup doc and confirmed it stays the source of truth
• Ran 3 parallel discovery agents (backend / frontend / domain)
• Identified target audiences (non-engineer roles included)
• Asked at most 3 clarifying questions with concrete options
• Confirmed badge set, diagram format, jargon level

Verification After Writing

Run these once — all use npx -y, no permanent install:

# Markdown lint
npx -y markdownlint-cli README.md

# Relative-link resolution
npx -y markdown-link-check README.md

# Mermaid renders (writes rendered .md to /tmp; visually inspect or rely on GitHub preview)
npx -y @mermaid-js/mermaid-cli -i README.md -o /tmp/readme-rendered.md

Then walk the checklist:

• All relative links resolve
• Mermaid blocks render
• No emojis (unless requested)
• Setup section is a teaser + link, not a copy
• Non-engineer can summarize the product after reading the first three sections
• Engineer can locate architecture, structure, and commands without scrolling past unfamiliar prose