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 tartinerlabs/skills --skill i18ngit clone --depth 1 https://github.com/tartinerlabs/skillsWrote 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/tartinerlabs/skills/i18n)<a href="https://agentmods.dev/skills/tartinerlabs/skills/i18n"><img src="https://agentmods.dev/badge/skills/tartinerlabs/skills/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/tartinerlabs/skills/i18n"><img src="https://agentmods.dev/badge/skills/tartinerlabs/skills/i18n.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 | $0.00096 | $0.01020 |
| Opus 5.5 | $0.00038 | $0.00408 |
| Sonnet 5.5 | $0.00019 | $0.00204 |
| Haiku 4.5 | $0.00010 | $0.00102 |
Grade A, and why
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 4d 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 — 63 lines — stays where its author put it; the contents beside it link to each section on GitHub.
You make an app ready for any language and region, so adding a language later is translation work, not a refactor. Use the platform's own localisation and formatting APIs as the source of truth — never a custom framework around them.
1. Pick the Mode
Decide from the request; do not ask.
- Build mode — the task creates or changes UI or formatting code. Apply the rules as constraints while writing it. Mention a rule only when it changed a decision, in one line.
- Adopt mode — the user asks to internationalise, prepare for translation, or fix i18n across the app. Work through Step 4.
Ship no new languages unless asked. Making strings localisable and adding translations are separate jobs.
2. Detect the Platform
Read the manifest as prose and load only the matching guide:
| Platform | Detected by | Load |
|---|---|---|
| Web / JS / TS | package.json |
references/js.md |
| Apple platforms | *.xcodeproj, Package.swift with an app target |
references/apple.md |
| Android | build.gradle(.kts) |
references/android.md |
If the project already uses an i18n library (next-intl, react-i18next, vue-i18n, FormatJS, …), keep it and follow its conventions; the guide covers what to check, not which library to swap to. React Native/Expo uses references/js.md for strings and formatting. Other stacks: apply the rules using that platform's ICU/CLDR-backed APIs.
3. Rules
| Rule | Impact | Applies to | File |
|---|---|---|---|
| Localisable strings | CRITICAL | every user-facing string, plurals, interpolation | rules/localisable-strings.md |
| Time zones and timestamps | CRITICAL | stored events, history, timelines, schedules | rules/time-zones.md |
| Locale-aware formatting | HIGH | dates, times, numbers, percentages, currency, durations | rules/locale-formatting.md |
| Units and measurements | HIGH | distance, speed, weight, temperature | rules/units.md |
| Text and layout | HIGH | user-generated text, layout, RTL, long translations | rules/text-and-layout.md |
| Deterministic tests | MEDIUM | tests touching dates, numbers, or strings | rules/deterministic-tests.md |
What ships with it
9 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.
- 4d ago First seen · 63 lines · 96 tokens per session scan A 43b585964be4
i18n is a skill published in the GitHub repository tartinerlabs/skills (8 stars, last pushed yesterday), licensed MIT. It adds 96 tokens to every session and 1,020 once invoked, about $0.0004 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 2026-10-20.
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