Prompt-to-PR: Build a Static SEO Site with Astro

Complete SOP for scaffolding a content-driven static SEO site with Astro, Tailwind, MDX content collections, sitemap, and canonical tags from scratch.

Scaffold a production-ready, fully static Astro 5 site optimized for organic search: content collections, Tailwind typography, @astrojs/sitemap, and correct <head> metadata wired up from day one.

1. Requirement

Build a static marketing/content site that scores 100 on Lighthouse SEO and Accessibility. Content is authored in MDX files managed by Astro content collections. No JavaScript framework needed — output is pure HTML+CSS with opt-in islands.

2. First Prompt

Scaffold a new Astro 5 static SEO site from scratch in the current directory.

Requirements:
1. Init with: `bunx create astro@latest . --template minimal --typescript strict --no-git`
2. Add integrations:
   - `@astrojs/tailwind` with `@tailwindcss/typography`
   - `@astrojs/sitemap`
   - `@astrojs/mdx`
3. Create a content collection `blog` in `src/content/blog/` with this Zod schema:
   title, description, pubDate (Date), updatedDate (Date, optional),
   author (string, default "Admin"), tags (string[], default []), draft (bool, default false).
4. Create a BaseLayout.astro with:
   - A `<head>` block: charset, viewport, canonical (`Astro.url.href`),
     og:title, og:description, og:url, og:type, twitter:card.
   - Accept `title`, `description`, `image` props.
5. Create pages:
   - `/` — hero + last 6 non-draft posts
   - `/blog` — paginated list (10 per page) using `paginate()`
   - `/blog/[slug]` — single post rendered with `<Content />`
   - `/tags/[tag]` — posts filtered by tag
6. Create `src/content/blog/hello-world.mdx` as a real sample post.
7. Configure `astro.config.ts`:
   - `site: process.env.SITE_URL ?? "http://localhost:4321"`
   - `integrations: [tailwind(), sitemap(), mdx()]`
   - `output: "static"`
8. Add a `.env.example` with `SITE_URL=https://example.com`.

3. Expected File Changes

astro.config.ts
tailwind.config.ts
src/content.config.ts                    (blog collection schema)
src/layouts/BaseLayout.astro             (head + canonical + OG tags)
src/pages/index.astro
src/pages/blog/index.astro               (paginated)
src/pages/blog/[slug].astro
src/pages/tags/[tag].astro
src/content/blog/hello-world.mdx
.env.example
package.json                             (updated with all integrations)

4. Review Checklist

astro.config.ts sets site — required for @astrojs/sitemap to emit absolute URLs.
BaseLayout.astro outputs a <link rel="canonical"> using Astro.url.href.
Blog list page uses Astro.props.page.data from paginate() — not a raw getCollection() call.
Draft posts (draft: true) are excluded in production via import.meta.env.PROD guard.
<html lang="en"> is set on the root element.
tailwind.config.ts includes the typography plugin and targets src/**/*.{astro,mdx}.
sitemap() integration is present — verify dist/sitemap-index.xml exists after bun run build.

5. Test Commands

bun install
bun run dev
# visit http://localhost:4321 and confirm hero + posts render

bun run build
# expect zero errors

bun run preview
# check /sitemap-index.xml and /sitemap-0.xml exist
# check /blog and /blog/hello-world render with correct <title> and canonical

# Lighthouse CLI smoke test (optional)
bunx lighthouse http://localhost:4321 --output json --quiet | jq '.categories.seo.score'
# expect 1 (100%)

6. Common Failures

Sitemap generates relative URLs — site missing from astro.config.ts. Add it.
getCollection returns drafts in production — filter: posts.filter(p => !p.data.draft || !import.meta.env.PROD).
Pagination 404 on /blog — first page must be /blog/ (index), not /blog/1. Astro’s paginate() outputs /blog/, /blog/2/, etc. by default.
MDX content not styled — @tailwindcss/typography prose class missing on the article wrapper in [slug].astro.
OG tags use relative image path — must be an absolute URL. Prefix with Astro.site.

7. Fix Prompt

The sitemap at /sitemap-0.xml contains relative paths like "/blog/hello-world"
instead of absolute URLs like "https://example.com/blog/hello-world".

Fix: add `site: "https://example.com"` (or `process.env.SITE_URL`) to the
top-level astro.config.ts object. The sitemap integration reads this value
to prefix all URLs.

8. PR Description

## Init: Static Astro 5 SEO site

- Astro 5 + TypeScript strict + Tailwind (with `@tailwindcss/typography`)
- `@astrojs/sitemap` and `@astrojs/mdx` integrations
- Content collection `blog` with Zod schema (title, description, pubDate, tags, draft)
- BaseLayout with canonical, OG, and Twitter Card meta tags
- Pages: home, paginated blog list, single post, tag archive
- Sample `hello-world.mdx` post
- `bun run build` emits `sitemap-index.xml` and all static pages