localization — Agent Skill

An Agent Skill that correctly formats, validates, and explains locale-specific conventions for currency, dates, numbers, units of measurement, and addresses — across 20+ locales, based on Unicode CLDR standards.

Works with any agent that supports the open SKILL.md format, including Cursor, Claude Code, Codex, and 60+ more via the skills CLI.

Inspired by @MostafaNageeb: those "trivial" formatting differences — like the € sign coming after the number in Germany (14 €) but before in the Netherlands (€ 14) — have a real impact on user trust.

Your agent will automatically use this skill when you ask about:

• Prices / currency — symbol position, decimal and thousands separators, spacing
• Dates and times — format order (DMY vs MDY vs YMD), 12h vs 24h, separators
• Numbers — grouping separators, decimal mark, large number abbreviations, ordinals
• Units of measurement — metric vs imperial, regional quirks (UK miles + °C)
• Addresses and phone numbers — field order, postal code format, RTL layouts

Format 1234.56 EUR for Germany, Netherlands, and France
Is "06/05/2026" ambiguous? How would each region read it?
Display this price for India: 1234567.89 INR
What address format does Japan use?

In Germany (de-DE), the euro sign comes after the number: 1.234,56 € In the Netherlands (nl-NL), the same amount is written with the euro sign before: € 1.234,56 Both use a comma as the decimal separator and a dot for thousands.

Install with the skills CLI — it auto-detects your agents and symlinks the skill into the right directories:

npx skills add ikhattab/l10n-skill

Common options:

# Install globally (available across all projects)
npx skills add ikhattab/l10n-skill -g

# Install to specific agents
npx skills add ikhattab/l10n-skill -a cursor -a claude-code

# Non-interactive (CI/CD friendly)
npx skills add ikhattab/l10n-skill -g -a cursor -y

Use without installing:

npx skills use ikhattab/l10n-skill@localization | claude

Browse and discover skills at skills.sh.

Copy or symlink the skills/localization folder into your agent's skills directory:

Example (Cursor, global):

ln -s "$(pwd)/skills/localization" ~/.cursor/skills/localization

• Germany vs Netherlands: same currency (€), opposite symbol position
• France / Russia: thousands separator is a narrow no-break space (U+202F), not a regular space
• India: lakh/crore grouping — ₹12,34,567 not ₹1,234,567
• Japan / Korea: no decimal places for ¥ and ₩
• US date 06/05: June 5th — in Europe it means May 6th
• Brazil: R$ 1.234,56 — note the space after R$
• Switzerland: apostrophe as thousands separator — CHF 1'234.56
• Japanese addresses: reversed from Western — postal code → prefecture → city → recipient

The skill ships with detailed reference files loaded on demand:

MIT — see LICENSE