icu-messageformat SKILL.md skillA
icu-messageformat from sigistry/marketplace is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add sigistry/marketplace/icu-messageformat@git:20260826.571bc2fPins git:20260826.571bc2f in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- sigistry/marketplace
- Path
plugins/a11y-i18n-remediator/skills/icu-messageformat/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260826.571bc2f, committed Aug 26, 2026
- First version recorded
- Jul 15, 2026
- Size
- 3,525 bytes
- Repository stars
- 3
- License
- MIT
This skill should be used when the user mentions "i18n", "internationalization", "ICU", "MessageFormat", "pluralization", "plural", "plural rules", "selectordinal", "gender select", "translation", "locale", "formatMessage", or getting number/date/plural agreement right across languages. It provides ICU MessageFormat correctness for pluralization, gender/select, and inline formatting.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# ICU MessageFormat
## Purpose
Provide a standardized reference for writing *correct* ICU MessageFormat, the syntax used by FormatJS/react-intl, react-i18next, vue-i18n, next-intl, and MessageFormat.js, so that translated strings agree grammatically in every target language. The single most common i18n bug is a sentence built by concatenation (`count + ' items'`); it is untranslatable because other languages inflect the noun, reorder the clause, or need more than two plural forms. ICU solves this by putting the grammar *inside* the message where translators can adapt it.
## The Core Rule: One Message, One Argument
Never split a sentence across strings or build it with `+`. A quantity, a name, or a gendered choice becomes an *argument* inside a single message, so the translator controls word order and agreement:
```
Bad: t('cart.count') + ' ' + t('cart.items') // untranslatable
Good: {count, plural, one {# item} other {# items}} // translator owns the plural
```
## Argument Types
| Form | Shape | Use for |
|---|---|---|
| Simple | `{name}` | interpolate a value verbatim |
…Read the whole file at its exact version.
How to install
mdr add sigistry/marketplace/icu-messageformat@sha256:a6a29884ebfd6b05The line at the top of this page pins the label git:20260826.571bc2f, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_zdenaddn4svvcnrp)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Jul 15, 2026 and Aug 26, 2026, about one every 42 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260826.571bc2f latest | 2026-08-26 | 571bc2f | 3,525 B | A | view · diff |
| git:20260715.6169119 | 2026-07-15 | 6169119 | 3,525 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (3525 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
sigistry/marketplace · 3 stars · license MIT · pushed 2026-10-30 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_zdenaddn4svvcnrp GET https://markdownregistry.com/api/v1/resolve?ref=sigistry/marketplace/icu-messageformat GET https://markdownregistry.com/api/v1/blob/a6a29884ebfd6b05e9d07519ea32c6e3c34974513c8a9123648340e63b19e4e3
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.