Docs & README Writer

Writes the README a stranger can clone-and-run from in five minutes. The standard: every command in the doc was actually derived from the repo (package.json, env usage, real file paths) — never from what projects like this "usually" do. A README with a command that doesn't work is worse than no README.

When to Use

• A project has no README, or the README lies about how to run it.
• Handing the repo to a collaborator, a client, a hackathon judge, or future-you.
• User wants setup/config/troubleshooting documented after shipping.
• Not for: announcing what changed in a release — use changelog-release-notes. Not for spec'ing a feature to build — use lovable-brief-writer.

Quick Reference

Procedure

1. Precheck — confirm the repo path, the audience (teammate dev? non-dev client? end user?), and where it's deployed (README should link the live thing). Audience changes depth: non-devs get more "install Node from nodejs.org", fewer flags.
2. Mine the repo — run the Quick Reference commands. Collect: name + real one-line purpose, install/dev/build commands from scripts, the full env var list, prerequisites (Node version, Supabase project, Stripe account…), and the 2–4 directories a newcomer should know about.
3. Draft the 5-minute start — the exact sequence: clone → install → configure env → run → what you should see. Every env var appears in an .env.example snippet with a placeholder and a one-line "where to get this" (dashboard URL). Placeholders only — real values never go in a README (see env-secrets-hygiene).
4. Config + troubleshooting — config as a table (Variable / Required? / What it does / Where to get it). Troubleshooting from real failure modes: what happens if each required var is missing, wrong Node version, port already in use, database not migrated. Format: symptom the user sees → cause → fix command.
5. Test the quickstart — this step is the skill. In a temp dir: fresh clone (or copy), follow your own doc exactly, keyboard only. Every command that fails or assumes unstated setup gets fixed in the doc, not worked around. Success: app running from doc alone.
6. Deliver — write README.md at the repo root (confirm before overwriting an existing README — offer a diff or merge of any sections worth keeping). Keep it under ~150 lines; deep dives go to docs/ and get linked.

Output Template

# <Project Name>
<One sentence: what it does and for whom.>  Live: <url>

## Quickstart (5 minutes)
Prereqs: Node <version>, <other>
1. git clone <url> && cd <dir>
2. npm install
3. cp .env.example .env   # then fill in the values below
4. npm run dev
5. Open http://localhost:3000 — you should see <specific thing>.

## Configuration
| Variable | Required | What it does | Where to get it |
|---|---|---|---|
| SUPABASE_URL | yes | database connection | supabase.com → project settings |

## Project layout
- `app/` — pages and routes
- `lib/` — shared logic

## Troubleshooting
**"Invalid API key" on load** → SUPABASE_URL/key missing or wrong → recheck step 3.
**Port 3000 in use** → `npm run dev -- -p 3001`

## Deploying
<one paragraph + link, e.g. Vercel — see vercel-deploy-check>

Pitfalls

• Documented from memory, not the repo — README says npm start, package.json says npm run dev. Recovery: scripts and env lists come only from the mining commands; if you didn't read it, don't write it.
• Quickstart assumes invisible setup — works for the author because their global config fills the gaps. Recovery: the fresh-clone test in step 5 exposes this; add every discovered prerequisite to the Prereqs line.
• Real secrets in the README or .env.example — docs get committed and shared. Recovery: placeholders only (sk_test_your_key_here); if a real key already shipped in a doc, rotate it now via env-secrets-hygiene.
• Everything-README — 600 lines covering architecture philosophy; nobody finds the run command. Recovery: quickstart stays in the first screenful; move essays to docs/ and link.
• Doc rot after the next feature — README describes last month's app. Recovery: end the README with a "docs updated: <date> @ <commit>" line, and re-run step 5 whenever setup-affecting changes ship.

Verification

• Quickstart executed top-to-bottom in a clean environment; app ran
• Every command in the doc copied from a real run, not typed from memory
• Env table matches the grep of actual process.env usage — no extras, no gaps
• Zero real secret values anywhere in README or .env.example
• Step 5 of the quickstart names the specific thing the user should see
• Existing README (if any) overwritten only with user confirmation