# Static Seo > > - **Type:** Skill - **Install:** `agentstack add skill-jdevalk-skills-static-seo` - **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior - **Seller:** [jdevalk](https://agentstack.voostack.com/s/jdevalk) - **Installs:** 0 - **Category:** [Developer Tools](https://agentstack.voostack.com/c/developer-tools) - **Latest version:** 0.1.0 - **License:** MIT - **Upstream author:** [jdevalk](https://github.com/jdevalk) - **Source:** https://github.com/jdevalk/skills/tree/main/static-seo ## Install ```sh agentstack add skill-jdevalk-skills-static-seo ``` Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent. ## About # Static SEO Audits and improves the SEO setup of a static HTML site against nine categories — head metadata, structured data, content quality, Open Graph images, sitemaps and indexing, agent discovery, performance, redirects, and CI validation. Recipes are platform-neutral: raw `` tags, raw JSON-LD, hand-rolled `sitemap.xml`, generic CI tooling. Audit framework parallels [`astro-seo`](../astro-seo/) but without the `@jdevalk/astro-seo-graph` spine. **Code recipes live in `AGENTS.md`** — read it when you need to implement a specific fix. This file has the workflow and audit checklist. ## Workflow 1. **Detect the project** — confirm this is a static site, identify the build tool, find where to apply changes. 2. **Audit** — score nine categories and produce actionable findings. 3. **Improve** — generate or modify files to close the gaps. Recipes are in `AGENTS.md`. 4. **Metadata pass** — invoke `metadata-check` on every short string the skill generated (titles, descriptions, schema `description` fields, FAQ answers). 5. **Verify** — run any build, validate the output, remind the user about non-file tasks (Search Console, Bing Webmaster Tools, IndexNow key submission). --- ## Phase 0: Detect the project Confirm the basics before auditing: - **It is actually a static site.** Look for built HTML — `index.html` at the repo root, or under `_site/` (Jekyll), `public/` (Hugo / 11ty / Gatsby), `dist/` (Vite / Astro static), `out/` (Next.js with `output: export`). If everything is server-rendered (Express, PHP, dynamic routes), this is the wrong skill — point at `astro-seo` for Astro, `wp-readme-optimizer` for WP plugin pages, or recommend a generic SEO audit instead. - **Source build tool.** Drives where to apply head metadata changes: - `_config.yml` / `_layouts/` → Jekyll - `config.toml` / `config.yaml` / `themes/` → Hugo - `.eleventy.js` / `_includes/` → 11ty - `gatsby-config.js` / `src/components/SEO.*` → Gatsby - `next.config.js` with `output: 'export'` and `pages/_document.tsx` → Next.js static export - `astro.config.mjs` → Astro (in which case **use `astro-seo` instead**) - No build config, just HTML files → hand-rolled or scraped (e.g. `wp-static-clone` output). Edit the HTML directly or use a post-process script. - **Canonical site URL.** Search the repo for the production origin — typically in `_config.yml`, `config.toml`, `astro.config`, or hardcoded into a layout. **If it's missing, empty, or `localhost`, flag as a blocking issue before anything else.** Canonicals, sitemaps, OG image URLs, and JSON-LD `@id` values all derive from this. - **Deployment target.** Read `vercel.json`, `netlify.toml`, `wrangler.toml`, or `public/_headers` to determine the host. Drives redirect and header syntax in Phase 2. - **Is the site multilingual?** Check for locale subdirectories (`/en/`, `/nl/`, `/de/`) or build-tool i18n config. If yes, hreflang matters; if no, skip it. - **What's already in ``?** Open one built HTML file and inventory: title, description, canonical, robots, Open Graph, Twitter cards, JSON-LD, hreflang. The audit in Phase 1 is faster if you can reference what's there. Ask only what you can't detect. --- ## Phase 1: Audit Score each category out of 10. For each, give 2–4 specific findings that quote the actual HTML, config, or template. Within each category, checks are tiered: - **Must** — ship blockers. A failure causes visible SEO regression. - **Should** — standard practice. Skipping costs reach. - **Nice** — forward-looking or situational. Useful but not baseline for every site. Skip **Nice** checks for small personal sites unless the user asks for the full treatment. ### 1. Head metadata (/10) - **Must** — every page has a `` and ``. - **Must** — `` set, with tracking parameters stripped, derived from the production origin. - **Must** — canonical omitted when the page is `noindex` (per Google's recommendation). - **Must** — `` length 30–65 characters, `` length 70–200 characters (the SERP-truncation bounds; same as `metadata-check` defaults). - **Should** — `` includes `max-snippet:-1`, `max-image-preview:large`, `max-video-preview:-1`. - **Should** — Open Graph (`og:title`, `og:description`, `og:image`, `og:url`, `og:type`, `og:site_name`) on every page. - **Should** — Twitter Card tags (`twitter:card`) suppressed when they duplicate Open Graph (Twitter falls back automatically). - **Should** — `hreflang` alternates on multilingual sites. Skip if monolingual. - **Should** — single `` and single `og:image` per page (legacy tooling sometimes emits duplicates). ### 2. Structured data / JSON-LD (/10) - **Must** — at least one `` block on every important page. - **Should** — linked `@graph` rather than a flat `Article` object — entities wired with `@id` references so a `BlogPosting` can point at its `Person` author and `WebPage` parent. - **Should** — `WebSite`, `Blog` / `WebPage`, `Person` / `Organization`, `BlogPosting` / `Article`, `BreadcrumbList`, `ImageObject` all present where relevant. - **Should** — trust signals: `publishingPrinciples`, `copyrightHolder`, `copyrightYear`, `knowsAbout`, `SearchAction`. - **Must** — validates in [Rich Results Test](https://search.google.com/test/rich-results) and [ClassySchema](https://classyschema.org/Visualisation). ### 3. Content quality (/10) - **Must** — every page has a unique `` and `` (no duplicate metadata across the site). - **Must** — exactly one `` per page. - **Should** — `` and `` audited via `metadata-check` (Phase 2.5) for front-loading, concreteness, and SERP fit. - **Should** — body prose audited via `readability-check` for individual long-form posts (don't bulk-audit). - **Should** — every `` has an `alt` attribute (or `alt=""` / `role="presentation"` for decorative). - **Should** — internal links use root-relative paths (`/foo/`) not absolute (`https://...`) — survives domain changes and previews. ### 4. Open Graph images (/10) - **Must** — every page has an OG image. - **Must** — 1200×675 (Google Discover minimum 1200px wide, 16:9 ratio). - **Should** — JPEG (social platforms don't reliably support WebP / AVIF for OG). - **Should** — generated at build time (satori-cli, sharp, ImageMagick, Vercel OG, Bannerbear) rather than uploaded manually per page — prevents drift. - **Should** — URL derived deterministically from the slug (e.g. `/og/.jpg`) so adding a page automatically gets an image. - **Should** — every `` in body content has an `alt` attribute (or `alt=""` / `role="presentation"`). Validated in CI via `html-proofer` or similar. ### 5. Sitemaps and indexing (/10) - **Must** — `/sitemap.xml` (or `/sitemap_index.xml` for split sitemaps) reachable, valid XML, every URL returns 200. - **Must** — `robots.txt` present at the site root and references the sitemap. - **Must** — RSS feed exists, advertised via ``, contains full post content (not truncated excerpts). - **Should** — split per-section if the site has multiple content types (`sitemap-posts.xml`, `sitemap-pages.xml`) — easier to debug indexing in GSC. - **Should** — `` populated from git commit timestamps (most accurate), build timestamps (acceptable), or frontmatter dates (last resort). Filesystem `mtime` from CI checkout is wrong — it's the checkout date, not the content date. - **Should** — IndexNow integrated. Verification key as a static `/.txt` route at the site root, plus a build-or-deploy hook that POSTs new URLs to `https://api.indexnow.org/IndexNow`. **Gate the submission on the production host** (e.g. `CF_PAGES_BRANCH=main`, `VERCEL_ENV=production`, `CONTEXT=production`) — unconditional submission pings the endpoint from local builds with URLs the production host hasn't served yet, which gets the key marked invalid (403) and forces rotation. ### 6. Agent discovery (/10) - **Should** — schema endpoints (`/schema/.json`) exposing corpus-wide JSON-LD per content type. Static JSON files committed to the repo or regenerated by the build. - **Should** — schema map (`/schemamap.xml`) listing every schema endpoint, with `Schemamap:` directive in `robots.txt`. - **Should** — [`llms.txt`](https://llmstxt.org) at the site root listing pages (title + description) for LLM consumers. Static text file; one line per page. - **Should** — markdown-alternate URLs (`/blog/post.md` next to `/blog/post/`) serving clean markdown with YAML frontmatter so AI agents can consume content without HTML parsing. Either commit `.md` siblings, or use a Cloudflare Transform Rule + `Vary: Accept` for content negotiation (CF Pages strips custom Vary headers, so use the Transform Rule's URL rewrite alone — recipe in `AGENTS.md`). - **Should** — API catalog at `/.well-known/api-catalog` per [RFC 9727](https://www.rfc-editor.org/rfc/rfc9727), as `application/linkset+json` ([RFC 9264](https://www.rfc-editor.org/rfc/rfc9264)). Lists schema endpoints, schemamap, RSS feed, and any site-specific APIs. Static JSON file. - **Should** — Content Signals directive in `robots.txt` (`Content-Signal: ai-train=yes, search=yes, ai-input=yes` or your preferred policy). One line, IETF draft, low cost. - **Should** — `Link` header on `/*` pointing to discovery files (sitemap, llms.txt, api-catalog, schemamap). Agents reading response headers find them without parsing HTML. Host-specific (`_headers` on Cloudflare Pages / Netlify, `vercel.json` on Vercel, server config elsewhere). - **Nice** — MCP server card at `/.well-known/mcp/server-card.json` and / or A2A agent card at `/.well-known/agent-card.json`. Only relevant when the site exposes an MCP server or A2A agent. - **Nice** — `` pointing to a conversational endpoint. NLWeb adoption is early; the tag is one line and worth having, but not a scoring blocker in 2026. - **Nice** — ARD ([Agentic Resource Discovery](https://agenticresourcediscovery.org/)) catalog at `/.well-known/ai-catalog.json`, listing what the domain offers (MCP server, A2A agent, OKF bundle, site-specific APIs). v0.9 draft, so optional — but it's the discovery layer the MCP / A2A cards and OKF bundle pay off through. Two gotchas: the base spec ([`Agent-Card/ai-catalog`](https://github.com/Agent-Card/ai-catalog)) names the media-type field `mediaType` while the ARD layer ([`ards-project/ard-spec`](https://github.com/ards-project/ard-spec)) names it `type` — emit **both keys with the same value** so the entry validates under either reading (both specs require consumers to ignore unknown keys). ARD also adds an optional `representativeQueries` array of sample prompts per entry. Static JSON file. - **Nice** — OKF ([Open Knowledge Format](https://github.com/GoogleCloudPlatform/knowledge-catalog)) bundle: a tree of typed Markdown concept files (one per page, paths mirroring canonical URLs) packaged as a single `.tar.gz`, with index files in between. Serving and discovery are explicit non-goals of OKF — that's what the ARD catalog entry is for. v0.9 draft, optional. There's **no registered media type yet**, so the interim string is `application/okf-bundle+gzip` (tracked in [knowledge-catalog#111](https://github.com/GoogleCloudPlatform/knowledge-catalog/issues/111) and [ard-spec#27](https://github.com/ards-project/ard-spec/issues/27)); mark it interim, it may change. Best generated from the same source the rest of the site derives from rather than a hand-maintained copy. ### 7. Performance (/10) - **Must** — hashed assets serve `Cache-Control: public, max-age=31536000, immutable` (or equivalent) so they only download once. - **Should** — primary web font preloaded as `woff2` via ``. - **Should** — `No-Vary-Search` response header strips UTM parameters from cache key (so `/?utm_source=x` and `/` share a cache entry). - **Should** — no render-blocking JavaScript on first paint (defer or async non-critical scripts). - **Should** — images use modern formats (WebP / AVIF for in-page content; JPEG only for OG cards) and `loading="lazy"` below the fold. - **Should** — all Lighthouse / PageSpeed Core Web Vitals in the green: LCP ` and ``, flags anything outside SERP-truncation bounds (title 30–65, description 70–200). --- ## Phase 2: Improve Based on the audit, produce concrete code. Always ask before overwriting. **Read `AGENTS.md` for detailed recipes.** **Branch on the Phase 0 findings.** If the site is a known build tool (Hugo, Jekyll, 11ty, Gatsby, Next.js), apply changes at the source level (templates, config, frontmatter). For hand-rolled or scraped HTML, post-process the built output. The recipes in `AGENTS.md` are output-shape recipes — show the HTML you want to land at — and a per-tool note on where to plumb them through. `AGENTS.md` sections: Head metadata (the canonical block), JSON-LD graph, OG image generation (build-script options), `sitemap.xml` and `robots.txt`, IndexNow, llms.txt, Markdown alternates, API catalog, Content Signals, Link headers, Performance headers, Redirects by host, CI workflows. --- ## Phase 2.5: Metadata and readability pass Invoke the `metadata-check` skill on every short string the skill generated or modified: page titles, meta descriptions, schema `description` fields, FAQ answers, and any frontmatter `excerpt` values you wrote. It checks front-loading, concreteness, filler, active voice, title / description duplication, difficult words, SERP-truncation fit (title 30–65, description 70–200), and one-idea-per-field. Apply fixes directly. Skip the pass for technical strings (URLs, schema `@id` values, enum values). If the project has a blog or docs section, mention as a follow-up that the `readability-check` skill can audit individual posts for multi-paragraph prose quality — but don't audit the entire content corpus yourself. --- ## Phase 3: Verify - Build the site (or rebuild if mid-iteration). Surface any build warnings. - Spot-check the built HTML: one page's `` should be clean, canonical correct, JSON-LD graph present and linked. - Run the homepage through [Rich Results Test](https://search.google.com/test/rich-results) and [ClassySchema](https://classyschema.org/Visualisation). - Confirm `/sitemap.xml` exists, returns 200, and references the right URLs. - Confirm `/robots.txt` references the sitemap and includes Content Signals. - If IndexNow is wired, confirm the key verification route returns the key at `/.txt`. - Run the local broken-link check (`linkinator http://localhost:8080 --recurse`). - Remind the user about tasks that can't be automated: - Register the site in [Google Search Console](https://search.google.com/search-console) and [Bing Webmaster Tools](https://www.bing.com/webmasters). - Submit the sitemap in both. - Generate an IndexNow key and commit the `.txt` verification file. - Install [Plausible](https://plausible.io/) or equivalent privacy-friendly analytics. --- ## Output format ```markdown ## Static SEO audit: [site name] ### Score | Category | Score | | ------------------------------------- | ----: | | 1. Head metadata | x/10 | | 2. Structured data / JSON-LD | x/10 | | 3. Content quality | x/10 | | 4. Open Graph images | x/10 | | 5. Sitemaps and indexing | x/10 | | 6. Agent discovery | x/10 | | 7. Performance | x/10 | | 8. Redirects and error handling | x/10 | | 9. CI validation | x/10 | | **Total** | xx/90 | ### Findings [Grouped by category. Quote actual HTML / config. Be specific.] ### Files generated or changed [List with short description of each.] ### Next steps [Non-file tasks: GSC, Bing Webmaster Tools, IndexNow key, analytics.] ``` --- ## Key principles - **Audit the output, fix at the source.** The skill checks the built HTML, but recommends changes at whatever layer produces it (Hugo template, Jekyll layout, 11ty include, post-process script). Don't recommend a fix that won't survive the next build. - **Static = host-portable.** Every recipe should work o … ## Source & license This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code. - **Author:** [jdevalk](https://github.com/jdevalk) - **Source:** [jdevalk/skills](https://github.com/jdevalk/skills) - **License:** MIT Install and usage instructions live in the source repository linked above. ## Pricing - **Free** — Free ## Security capabilities Automated source analysis of v0.1.0 — what this tool can access: - **Network access:** yes - **Filesystem access:** no - **Shell / process execution:** no - **Environment & secrets:** no - **Dynamic code execution:** no *"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.* ## Versions - **0.1.0** — security scan: passed — Imported from the upstream source. ## Links - Listing page: https://agentstack.voostack.com/l/skill-jdevalk-skills-static-seo - Seller: https://agentstack.voostack.com/s/jdevalk - Browse the marketplace: https://agentstack.voostack.com/browse --- Listed on AgentStack — the marketplace for AI agent skills and MCP servers. Every listing is security-reviewed. Creators keep 70%.