How do I install the API I18N Localization skill?

Run npx skillmds@latest add deangrant/api-i18n-localization in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is API I18N Localization safe to use?

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Which AI agents work with API I18N Localization?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is API I18N Localization free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published API I18N Localization?

deangrant (@deangrant) published this skill. Their other Agent Skills are listed on their SkillMD profile.

API I18N Localization

Name: API I18N Localization
Author: deangrant

Design internationalized REST APIs: Accept-Language, UTC storage, localized messages vs data, and explicit country/region params for business rules. Use when adding locales or fixing mixed timezone/locale bugs.

deangrant d44fc04 4 files · 1.9 KB Updated Sep 17, 2026

Integrations & APIs

Install

Press C to copy

$ npx skillmds@latest add deangrant/api-i18n-localization

Installs into ~/.claude/skills (or .claude/skills inside a project). Restart Claude Code to pick it up.

Download .zip

＋ Add to collection

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Trust & safety

Audits pending

Not yet audited · commit d44fc04

Works with: Claude Code Claude.ai OpenAI Codex +

File contents

Internationalization and Localization

Use this skill when APIs serve multiple locales/regions.

1. Split concerns

Concern	Approach
Message language	`Accept-Language` → localized `detail`/UI strings
Data timestamps	Store/transmit UTC RFC 3339; client displays
Business rules (tax, catalog)	Explicit `country` / `region` param — not only language

2. Guidance

Do not overload Accept-Language for currency/tax jurisdiction.
Keep machine-stable type URIs in problem+json; localize detail/title if needed.
Document default locale when header absent.

3. Quick checklist

Accept-Language honored for user-facing text.
Timestamps UTC on the wire.
Country/region explicit for business logic.
Defaults documented.

See reference.md and examples.md.

deangrant/agents/tree/main/.agents/skills/api-i18n-localization commit d44fc04efb

Frequently asked questions

npx skillmds@latest add deangrant/api-i18n-localization