Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/christopherlouet/claude-basenpx agentmods add skills/christopherlouet/claude-base/dev-i18nWrote 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/christopherlouet/claude-base/dev-i18n)<a href="https://agentmods.dev/skills/christopherlouet/claude-base/dev-i18n"><img src="https://agentmods.dev/badge/skills/christopherlouet/claude-base/dev-i18n/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/christopherlouet/claude-base/dev-i18n"><img src="https://agentmods.dev/badge/skills/christopherlouet/claude-base/dev-i18n.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 3 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium MCP Rug Pull · line 327 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 357 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
- medium MCP Rug Pull · line 371 npx commands without a version suffix (e.g. @1.0.0) create a rug-pull risk if the upstream server is compromised and publishes a malicious update.Fix: Pin the version: npx @scope/[email protected]
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 | $0.00079 | $0.02784 |
| Opus 5.5 | $0.00032 | $0.01114 |
| Sonnet 5.5 | $0.00016 | $0.00557 |
| Haiku 4.5 | $0.00008 | $0.00278 |
Grade A, and why
dev-i18n 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 20d 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 — 421 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Internationalization (i18n)
Choosing your lib
Web
| Lib | Stack | Strength | Avoid |
|---|---|---|---|
| next-intl | Next.js 13+ App Router | Server Components first, type-safe, localized routes | Pages Router projects (use next-i18next) |
| react-i18next | React vanilla / SPA | Mature, large ecosystem, plugins | Heavy for SSR without effort |
| formatjs (react-intl) | React | ICU MessageFormat standard | More verbose boilerplate |
| vue-i18n | Vue 3 / Nuxt | Native, Composition API, lazy load | Vue-specific |
| svelte-i18n / paraglide | Svelte/SvelteKit | Lean, compile-time (paraglide) | Smaller ecosystem |
Mobile
| Lib | Stack |
|---|---|
| flutter_localizations + intl | Flutter official, ARB files |
| slang | Flutter alternative, type-safe, code-generation |
| react-native-localize + i18next | React Native |
next-intl (Next.js App Router)
Setup
npm install next-intl
messages/
fr.json
en.json
app/
[locale]/
layout.tsx
page.tsx
middleware.ts
i18n/
request.ts
routing.ts
Config
// i18n/routing.ts
import { defineRouting } from "next-intl/routing";
export const routing = defineRouting({
locales: ["fr", "en"],
defaultLocale: "fr",
localePrefix: "as-needed", // /en/about, /about (default locale)
});
// middleware.ts
import createMiddleware from "next-intl/middleware";
import { routing } from "./i18n/routing";
export default createMiddleware(routing);
export const config = {
matcher: ["/", "/(fr|en)/:path*"],
};
Server Component usage
// app/[locale]/page.tsx
import { getTranslations } from "next-intl/server";
export default async function Page() {
const t = await getTranslations("home");
return <h1>{t("title")}</h1>;
}
Client Component usage
"use client";
import { useTranslations } from "next-intl";
export function Greeting() {
const t = useTranslations("home");
return <p>{t("welcome", { name: "Alice" })}</p>;
}
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.
- 20d ago Changed · +4 lines 5b4be08bcc43
- 27d ago Changed · -2 lines cacf37e265be
- 28d ago Changed · -6 lines 4f858a75260b
- 29d ago Changed · -1 lines f33d2f6483ae
- 1mo ago First seen · 426 lines · 79 tokens per session scan A dabbe21fe854
dev-i18n is a skill published in the GitHub repository christopherlouet/claude-base (5 stars, last pushed 7d ago), licensed MIT. It adds 79 tokens to every session and 2,784 once invoked, about $0.0003 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 2026-09-03.
Other skills, from other repositories
i18n-localization
Internationalization and localization for global applications. Use when adding multi-language support, handling regional formats, or preparing apps for global markets.
agent-i18n-specialist
Specialist subagent: Expert internationalization specialist for multi-language support and localization.
internationalization-i18n
Implement internationalization (i18n) best practices for web and mobile applications to support multiple languages and locales.
microservices-architecture
Microservices architecture patterns and best practices. Use when designing distributed systems, breaking down monoliths, or implementing service communication.
accessibility-a11y
WCAG 2.2 compliance, ARIA patterns, keyboard navigation, screen readers, automated testing.
ios-development
Comprehensive guide for building native Apple platform applications.