localization-testing

localization-testing is a skill for Claude Code from summarybotng/summarybot-ng. It costs 48 tokens per session (1,621 once invoked), scanned A, original, MIT.

A testing guide for software that supports multiple languages and regions. It covers translations, date and currency formats, right-to-left languages such as Arabic and Hebrew, character encoding, and cultural details.

In plain words
What is it for?
Use it to check translated strings, locale-specific formatting, right-to-left layouts, Unicode text, and market-specific content.
Why use it?
Text, layouts, numbers, and symbols can break or become inappropriate when an application is used in another locale.

Skill for Claude Code

Written for Claude Code: installed under .claude/. Also seen: positional $N argument.

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.

agentmods
npx agentmods add skills/summarybotng/summarybot-ng/localization-testing
Any agent
npx skills add summarybotng/summarybot-ng --skill localization-testing
Clone the repo
git clone --depth 1 https://github.com/summarybotng/summarybot-ng

Made for: Claude Code.

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-testing

README.md
[![agentmods](https://agentmods.dev/badge/skills/summarybotng/summarybot-ng/localization-testing.svg)](https://agentmods.dev/skills/summarybotng/summarybot-ng/localization-testing)
Your own site
<a href="https://agentmods.dev/skills/summarybotng/summarybot-ng/localization-testing"><img src="https://agentmods.dev/badge/skills/summarybotng/summarybot-ng/localization-testing.svg" alt="Measured on agentmods" height="20"></a>
Per session 48 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,621 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00048 $0.01621
Opus 5 $0.00024 $0.00811
Sonnet 5 $0.00010 $0.00324
Haiku 4.5 $0.00005 $0.00162

Measured 2d ago against content hash 4be650c6db74, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

localization-testing 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 2d 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.

.claude/skills/localization-testing/SKILL.md · 228 lines

How it starts

The opening of the file, as written. The whole thing — 228 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Localization & Internationalization Testing

<default_to_action> When testing multi-language/region support:

  1. VERIFY translation coverage (all strings translated)
  2. TEST locale-specific formats (date, time, currency, numbers)
  3. VALIDATE RTL layout (Arabic, Hebrew)
  4. CHECK character encoding (UTF-8, unicode)
  5. CONFIRM cultural appropriateness (icons, colors, content)

Quick i18n Checklist:

  • All user-facing strings externalized
  • No hardcoded text in code
  • Date/time/currency formatted per locale
  • RTL languages flip layout correctly
  • Unicode characters display properly

Critical Success Factors:

  • Don't hardcode strings - externalize everything
  • Test with real speakers, not just translation files
  • RTL requires mirrored UI layout </default_to_action>

Quick Reference Card

When to Use

  • Launching in new markets
  • Adding language support
  • Before international releases
  • After UI changes

i18n vs l10n

Term Full Name Focus
i18n Internationalization Building for localization
l10n Localization Adapting for specific locale

Common Locale Formats

Type US (en-US) UK (en-GB) Japan (ja-JP)
Date 10/24/2025 24/10/2025 2025/10/24
Currency $1,234.56 £1,234.56 ¥1,235
Number 1,234.56 1,234.56 1,234.56

Translation Coverage Testing

test('all strings are translated', () => {
  const enKeys = Object.keys(translations.en);
  const frKeys = Object.keys(translations.fr);
  const esKeys = Object.keys(translations.es);

  // All locales have same keys
  expect(frKeys).toEqual(enKeys);
  expect(esKeys).toEqual(enKeys);
});

test('no missing translation placeholders', async ({ page }) => {
  await page.goto('/?lang=fr');
  const text = await page.textContent('body');

  // Should not see placeholder keys
  expect(text).not.toContain('translation.missing');
  expect(text).not.toMatch(/\{\{.*\}\}/); // {{key}} format
});

Read the full file on GitHub · 228 lines

Files

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.

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. 2d ago First seen · 228 lines · 48 tokens per session scan A 4be650c6db74

Subscribe to this mod's changes

localization-testing is a skill published in the GitHub repository summarybotng/summarybot-ng (2 stars, last pushed 2mo ago), licensed MIT. It adds 48 tokens to every session and 1,621 once invoked, about $0.0002 per session on Opus 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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