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-technicalgit 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-technical)<a href="https://agentmods.dev/skills/s0vers/next-app-i18n-starter/nextjs-seo-technical"><img src="https://agentmods.dev/badge/skills/s0vers/next-app-i18n-starter/nextjs-seo-technical/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-technical"><img src="https://agentmods.dev/badge/skills/s0vers/next-app-i18n-starter/nextjs-seo-technical.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 | $0.00115 | $0.01286 |
| Opus 5.5 | $0.00046 | $0.00514 |
| Sonnet 5.5 | $0.00023 | $0.00257 |
| Haiku 4.5 | $0.00012 | $0.00129 |
Grade A, and why
nextjs-seo-technical 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 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
4. A `notFound()` page returns 404 only if nothing has started streaming, because the status line goes out with the first byte. Check the status with `curl -sI`. [doc] This is a copy
86% identical to nextjs-seo-structured-data — 37 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 56 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Technical SEO for Next.js
Search engines find a page, fetch it, understand it, and choose it over alternatives. Every technical problem is one of these failing. Name the failing step before proposing a change. A fix aimed at the wrong step looks like progress and changes nothing.
Gate: can this URL be indexed at all
Answer before any other work. Stop at the first no.
- It returns 200 to a request with no cookies and no
Accept-Language. robots.ts, the host, the CDN, and authentication allow it.- No
noindexin the initial HTML orX-Robots-Tag. - Its canonical points at itself, or at the URL you intend.
- An indexed page links to it and the sitemap lists it.
Skip the gate ("gate not applicable") when nothing creates a URL or alters an indexing signal. Before launch, run it on the route's local output and hand the five answers to the owner as the launch checklist, each with its expected result and the URL to run it on. Every result is a hypothesis until checked live.
Read
| Task | Reference |
|---|---|
| Missing from results, wrong URL shown, rendering, robots, sitemap, redirects, status codes, canonicals, Core Web Vitals, Next.js metadata | Technical SEO |
| Site audit, launch gate, URL or domain migration, locale added or removed | Audits, launches, migrations |
| A long audit or diagnosis report, finding dispositions | Evidence and reporting |
Rules
- A sitemap lists only indexable 200 canonical URLs, with
lastModifiedfrom a real content change. A build time changes on every deploy and tells crawlers nothing. [doc] - Never block a URL in robots.txt to
noindexit. A blocked page never shows itsnoindex. Allow the fetch and sendnoindex. [doc] - Never redirect a removed page to the homepage. Use 404, 410, or the true successor. It reads as a soft 404. [doc]
- A
notFound()page returns 404 only if nothing has started streaming, because the status line goes out with the first byte. Check the status withcurl -sI. [doc] - Run this skill's
scripts/verify-seo.mjs --base http://localhost:3000against a running site (in this starter:bun run seo:verify -- --base http://localhost:3000). It checks canonicals, alternates,lang, JSON-LD, sitemap agreement, and language redirects. It proves local implementation only.
What ships with it
5 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 · 56 lines · 115 tokens per session scan A 542e3ea575a5
nextjs-seo-technical is a skill published in the GitHub repository s0vers/next-app-i18n-starter (66 stars, last pushed 6d ago), licensed MIT. It adds 115 tokens to every session and 1,286 once invoked, about $0.0005 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). It is 86% identical to nextjs-seo-structured-data, differing in 37 lines, and is treated as a copy.
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