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/mickeyyaya/refactoring-skillsnpx agentmods add skills/mickeyyaya/refactoring-skills/i18n-l10n-patternsWrote 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/mickeyyaya/refactoring-skills/i18n-l10n-patterns)<a href="https://agentmods.dev/skills/mickeyyaya/refactoring-skills/i18n-l10n-patterns"><img src="https://agentmods.dev/badge/skills/mickeyyaya/refactoring-skills/i18n-l10n-patterns/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/mickeyyaya/refactoring-skills/i18n-l10n-patterns"><img src="https://agentmods.dev/badge/skills/mickeyyaya/refactoring-skills/i18n-l10n-patterns.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 | $0.00076 | $0.05526 |
| Opus 5 | $0.00038 | $0.02763 |
| Sonnet 5 | $0.00015 | $0.01105 |
| Haiku 4.5 | $0.00008 | $0.00553 |
Grade A, and why
i18n-l10n-patterns 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 11d 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 — 531 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Internationalization and Localization Patterns
Overview
Hardcoded strings, binary plural logic, and locale-less date formatting create invisible bugs that only surface when users switch languages or regions. Use this guide when building new features that display user-visible text, numbers, dates, or currency — and during code review to catch i18n defects before they ship.
When to use: Any feature that renders text, numbers, dates, times, or currency to users; reviewing components for hardcoded strings; evaluating plural and date formatting logic; adding RTL language support; designing translation workflows.
Quick Reference
| Topic | Core Idea | Primary Red Flag |
|---|---|---|
| Message Externalization | All user-visible strings in resource bundles or JSON | String literals in JSX/templates |
| ICU MessageFormat | Rich interpolation, plurals, selects in one syntax | String concatenation to build sentences |
| CLDR Plural Rules | Six categories: zero/one/two/few/many/other | count === 1 ? "item" : "items" binary check |
| Intl.DateTimeFormat | Locale-aware date/time via native API | toLocaleDateString() without explicit locale |
| Intl.NumberFormat | Locale-aware numbers and currency | Manual decimal/comma formatting |
| RTL Layout | CSS logical properties + dir attribute |
margin-left, padding-right hard-coding direction |
| Intl.Collator | Locale-correct string sorting | Array.sort() with default JS comparator |
| Translation Workflow | Key-based lookups, context annotations, interpolation | Source strings directly in JSX |
| i18n Testing | Pseudo-localization, string expansion, missing key detection | No i18n-specific test coverage |
Patterns in Detail
1. Message Externalization
Store every user-visible string outside source code in resource bundles (.properties, .po) or structured JSON translation files. Business logic must never contain literal display strings.
Red Flags:
- String literals inside JSX:
<h1>Welcome back!</h1> - Template literals building UI text:
`Hello ${name}, you have ${n} messages` - Error messages hardcoded in API responses
- Strings mixed with logic:
label = isAdmin ? "Admin Panel" : "My Dashboard"
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.
- 11d ago First seen · 531 lines · 76 tokens per session scan A c3b51c02d3b0
i18n-l10n-patterns is a skill published in the GitHub repository mickeyyaya/refactoring-skills (6 stars, last pushed 5mo ago), licensed MIT. It adds 76 tokens to every session and 5,526 once invoked, about $0.0004 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 2026-08-31.
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