Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/jdevalk/skills/astro-seonpx skills add jdevalk/skills --skill astro-seogit clone --depth 1 https://github.com/jdevalk/skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/jdevalk/skills/astro-seo)<a href="https://agentmods.dev/skills/jdevalk/skills/astro-seo"><img src="https://agentmods.dev/badge/skills/jdevalk/skills/astro-seo.svg" alt="Measured on agentmods" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00105 | $0.04833 |
| Opus 5 | $0.00053 | $0.02416 |
| Sonnet 5 | $0.00021 | $0.00967 |
| Haiku 4.5 | $0.00011 | $0.00483 |
Grade A, and why
astro-seo scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 5d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
- **Should** — `lastmod` populated from git commit timestamps, not frontmatter dates or CI file timestamps. `@jdevalk/astro-seo-graph` ≥ 1.4.0 exports `gitLastmod(filePath, { excludeCommits, depth })` for this — it retur How it starts
The opening of the file, as written. The whole thing — 212 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Astro SEO
Audits and improves the SEO setup of an Astro site against the full stack described in Astro SEO: the definitive guide. The skill covers nine areas — technical foundation, structured data, content, site structure, performance, sitemaps and indexing, agent discovery, redirects, and analytics — and produces drop-in code for anything missing or weak.
The opinionated spine of this skill is @jdevalk/astro-seo-graph. Most of the fixes route through it. If the project doesn't use it yet, installing it is the first recommendation.
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
- Detect the project — confirm this is an Astro site and understand its shape.
- Audit — score nine categories and produce actionable findings.
- Improve — generate or modify files to close the gaps. Recipes are in
AGENTS.md. - Metadata pass — invoke
metadata-checkon every short string the skill generated (titles, descriptions, schemadescriptionfields, FAQ answers, frontmatter excerpts). - Verify — run the build, check validations pass, remind the user about non-file tasks (Search Console, Bing Webmaster Tools, IndexNow key verification).
Phase 0: Detect the project
Confirm the basics before auditing:
astro.config.mjs/astro.config.tsexists.package.jsonhasastroas a dependency.site:is set inastro.config— canonicals, sitemaps, and OG image URLs all derive from this. If it's missing, empty, orhttp://localhost, flag it as a blocking issue before anything else. This is the single most common misconfiguration.- Content collections in
src/content/(or legacysrc/pages/markdown). - Deployment target — read
package.json,vercel.json,netlify.toml,wrangler.toml, orpublic/_headersto determine the host. This drives redirect and header syntax in Phase 2. - Is
@jdevalk/astro-seo-graphalready installed? If yes, record the version and which features are wired (grep for<Seo,seoGraph(,createSchemaEndpoint,createSchemaMap,FuzzyRedirect,createIndexNowKeyRoute,createMarkdownEndpoint,createApiCatalog,gitLastmod). Check the installed version against the latest on npm withnpm view @jdevalk/astro-seo-graph version. If the project is behind, recommend an upgrade in Phase 2 before auditing feature gaps — the package ships new defaults and fixes regularly, and an outdated version is a plausible cause for any audit finding. Phase 2 branches on this. - Is the site multilingual? Check for
i18ninastro.configor multiple locale directories undersrc/content/. If yes, hreflang matters; if no, skip it.
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 5d ago First seen · 212 lines · 105 tokens per session scan A 58ab70dc056c
astro-seo is a skill published in the GitHub repository jdevalk/skills (97 stars, last pushed 2mo ago), licensed MIT. It adds 105 tokens to every session and 4,833 once invoked, about $0.0005 per session on Opus 5. A static security scan graded it A with 1 finding (runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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