localization-l10n

localization-l10n is a skill for Claude Code from Mindrally/skills. It costs 28 tokens per session (1,325 once invoked), scanned A, original, Apache-2.0.

A set of practices for adapting an application to different languages, regions, and cultural conventions; this process is called localization.

In plain words
What is it for?
Use it when adding language support to web or mobile applications, organizing translation files, detecting user locales, and providing fallbacks.
Why use it?
It helps prevent incorrect translations and regional formatting problems with text, dates, numbers, currencies, and varying content lengths.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: positional $N argument.

Part of the mindrally-skills plugin — 217 skills shipped together

Good fit Use it when adding language support to web or mobile applications, organizing translation files, detecting user locales, and providing fallbacks.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/mindrally/skills/localization-l10n
Install

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.

Any agent
npx skills add Mindrally/skills --skill localization-l10n
Clone the repo
git clone --depth 1 https://github.com/Mindrally/skills

Made for: Claude Code.

Or install mindrally-skills, the plugin that ships this one along with the rest of its 217 skills.

Wrote 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.

agentmods badge for localization-l10n

README.md
[![agentmods](https://agentmods.dev/badge/skills/mindrally/skills/localization-l10n/github.svg)](https://agentmods.dev/skills/mindrally/skills/localization-l10n)
Your own site
<a href="https://agentmods.dev/skills/mindrally/skills/localization-l10n"><img src="https://agentmods.dev/badge/skills/mindrally/skills/localization-l10n/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.

agentmods 80×15 button for localization-l10n

Your own site · 80×15
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Per session 28 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,325 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • Socket pass 15 Sept 2026
  • Snyk pass 15 Sept 2026
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00028 $0.01325
Opus 5.5 $0.00011 $0.00530
Sonnet 5.5 $0.00006 $0.00265
Haiku 4.5 $0.00003 $0.00133

Measured 15d ago against content hash 0435e3724c6b, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

localization-l10n 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 15d 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.

localization-l10n/SKILL.md · 219 lines

How it starts

The opening of the file, as written. The whole thing — 219 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Localization (l10n)

You are an expert in localization for web and mobile applications. Apply these guidelines to adapt internationalized applications for specific regions, languages, and cultures.

Core Principles

  • Localization (l10n) builds on internationalization (i18n)
  • Ensure all user-facing text supports localization
  • Adapt content for cultural appropriateness
  • Respect regional conventions for dates, numbers, and currency
  • Design for content that varies significantly between locales

Localization Libraries

Web Applications

  • Use i18next and react-i18next for web applications
  • Implement namespace-based translation organization
  • Use libraries like react-intl or next-i18next for Next.js applications
  • Leverage formatjs for ICU message format support

Mobile Applications

  • Use expo-localization for React Native apps
  • Use react-native-i18n or expo-localization for internationalization and localization
  • Support multiple languages with fallback mechanisms
  • Handle device locale detection automatically

Translation Management

File Organization

locales/
  en-US/
    common.json
    legal.json
    marketing.json
  en-GB/
    common.json
    legal.json
    marketing.json
  es-ES/
    common.json
    legal.json
    marketing.json
  es-MX/
    common.json
    legal.json
    marketing.json

Regional Variants

  • Support regional language variants (en-US vs en-GB, es-ES vs es-MX)
  • Implement fallback chains (es-MX -> es -> en)
  • Handle spelling differences (color vs colour)
  • Adapt terminology for regional preferences

Locale-Specific Formatting

Date and Time Formatting

// Format dates according to locale
const formatDate = (date: Date, locale: string) => {
  return new Intl.DateTimeFormat(locale, {
    year: 'numeric',
    month: 'long',
    day: 'numeric'
  }).format(date);
};

// US: January 23, 2026
// UK: 23 January 2026
// Germany: 23. Januar 2026

Number Formatting

// Format numbers according to locale
const formatNumber = (num: number, locale: string) => {
  return new Intl.NumberFormat(locale).format(num);
};

// US: 1,234,567.89
// Germany: 1.234.567,89
// France: 1 234 567,89

Read the full file on GitHub · 219 lines

Changes

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.

  1. 15d ago Changed · +3 lines 0435e3724c6b
  2. 1mo ago First seen · 216 lines · 28 tokens per session scan A 760ca53ab2a8

Subscribe to this mod's changes

localization-l10n is a skill published in the GitHub repository Mindrally/skills (285 stars, last pushed 15d ago), licensed Apache-2.0. It adds 28 tokens to every session and 1,325 once invoked, about $0.0001 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.

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