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 skills add s0vers/next-app-i18n-starter --skill nextjs-seo-internationalgit clone --depth 1 https://github.com/s0vers/next-app-i18n-starterWrote 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/s0vers/next-app-i18n-starter/nextjs-seo-international)<a href="https://agentmods.dev/skills/s0vers/next-app-i18n-starter/nextjs-seo-international"><img src="https://agentmods.dev/badge/skills/s0vers/next-app-i18n-starter/nextjs-seo-international/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/s0vers/next-app-i18n-starter/nextjs-seo-international"><img src="https://agentmods.dev/badge/skills/s0vers/next-app-i18n-starter/nextjs-seo-international.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00091 | $0.01119 |
| Opus 5.5 | $0.00036 | $0.00448 |
| Sonnet 5.5 | $0.00018 | $0.00224 |
| Haiku 4.5 | $0.00009 | $0.00112 |
Grade A, and why
nextjs-seo-international scanned grade A with 0 findings 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 16d 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 44 lines — stays where its author put it; the contents beside it link to each section on GitHub.
International SEO for Next.js
A language switcher is a product feature. International SEO also needs the right audience, URL, content, and search intent per market. Before any content work, confirm each locale URL returns 200 without cookies, is not blocked or noindex, canonicalizes to itself, and is linked and in the sitemap.
Read
| Task | Reference |
|---|---|
| Tags, URL structure, alternate sets, partial translation, the switcher, translation quality, Bing, Yandex, Baidu, per-locale notes | International SEO |
Helpers, routing flags, and defaults in this starter (getAlternateLanguages, alternateLinks, localeCookie) |
Template notes |
Rules
- Every translated, indexable page has its own URL, a self-canonical, and a sitemap entry, because search engines follow neither cookies nor
Accept-Language. Never canonicalize translations to English. [doc] hreflanglinks only real, reviewed translations, reciprocal, self-referencing, absolute, and generated from one function. Identical copies in HTML and the sitemap are fine. A third copy with other tags (the proxyLinkheader) is the failure. An alternate to a page that does not exist is harmful. [doc]- Never redirect by language, cookie, or IP. Googlebot sends no
Accept-Languageand crawls mostly from the US, so the redirect hides pages from it. [doc] - Never emit alternates for every configured locale on a partly translated page. Emit the reviewed set, and return 404 for the rest. [doc]
- Unreviewed bulk machine translation is scaled content abuse. A locale page that renders the default language is a duplicate. [doc]
- Use language-only tags (
es,zh-Hans) unless the content differs by country. Google accepts only ISO 639-1 languages, optional ISO 15924 scripts, and ISO 3166-1 regions. [doc]
Working method
- Orient. Read the root
AGENTS.mdif the project has one, the route and its rendered output, and the file that builds page metadata. Never read.env. Done when you can name that file. - Frame. Write the URL set, page type, locale or market, and target outcome, one line each. Ask only when an answer changes the work, and state the default you will use if nobody answers. Done when all four lines exist and every open question is asked or carries a stated default.
- Change and verify. Make the smallest change with the project's own helpers. When a server is running and the
nextjs-seo-technicalskill is installed, run itsscripts/verify-seo.mjs(in this starter:bun run seo:verify), then the project's lint and build. Done when every check ends in one of the four verdicts below. - Report, in the shape below.
What ships with it
3 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.
- 16d ago First seen · 44 lines · 91 tokens per session scan A ad22b322f6b1
nextjs-seo-international is a skill published in the GitHub repository s0vers/next-app-i18n-starter (66 stars, last pushed 6d ago), licensed MIT. It adds 91 tokens to every session and 1,119 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-30.
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