I18n

io.github.rog0xPublished by GitHub account rog0xv1.0.2Updated Oct 24, 2026

Locale detect, translations, plurals for AI agents

VerifiedSTDIODesktop onlyFiles & StorageDeveloper Tools

Overview

AI-generated overview

Local MCP server giving an assistant internationalization tools: locale detection, i18n key extraction, translation file checks, plural rules, and locale…

What you can do
Exposes five tools for localization work. detect_locale identifies the language and locale of a text string, returning a BCP 47 code, script, confidence score, and alternate candidates. extract_i18n_keys finds hardcoded user-facing strings in source code, such as JSX attributes, HTML text, console calls, thrown errors, dialogs, and i18n-named variables, with line and column and a suggested key. analyze_translations compares translation JSON files across locales for missing, extra, unused, or empty keys, structure and interpolation mismatches. plural_rules returns CLDR plural categories, and format_locale formats numbers, currencies, dates, and relative times.
When to use it
Useful when an assistant is helping with localization: auditing a codebase for hardcoded strings, checking translation files for drift between locales, or producing correct plural forms and locale-specific number, currency, and date formatting.
Requirements
Runs locally as a Node.js process over stdio, installed from the npm package @rog0x/mcp-i18n-tools; the README shows building it and pointing the client at the built dist/index.js file. No authentication, environment variables, or headers are declared. Desktop only; no web executable.
Before you install
The tools read source code and translation files supplied to them, so only point it at code and locale files you are comfortable processing. It reports findings and suggestions; it does not appear to write, send, or delete data on its own.

Installation

In SourceWeft

  1. Open I18n in the dashboard and add it to a workspace.
  2. Enable the server for the chats that should use its tools.

Desktop only via STDIO. STDIO servers start a local process, so they need the SourceWeft desktop host.

Other MCP clients

Follow the launch instructions in the repository.

README

@rog0x/mcp-i18n-tools

Internationalization and localization tools for AI agents, exposed as an MCP (Model Context Protocol) server.

Tools

detect_locale

Detect the language and locale of a given text string. Returns the detected language code (BCP 47), language name, writing script, confidence score (0-1), and alternate language candidates.

Supported languages: English, Spanish, French, German, Portuguese, Italian, Russian, Japanese, Korean, Chinese, Arabic, Hindi, Thai, Greek, Hebrew.

extract_i18n_keys

Extract hardcoded user-facing strings from source code that should be internationalized. Finds strings in:

  • JSX/TSX attributes (title, placeholder, label, alt, aria-label, etc.)
  • HTML template text and attributes
  • console.log / console.warn / console.error calls
  • throw new Error(...) messages
  • alert() / confirm() / prompt() dialogs
  • Variable assignments with i18n-relevant names (message, label, title, etc.)

Returns each string with its line/column, surrounding context, pattern type, and a suggested i18n key.

analyze_translations

Analyze translation JSON files for consistency across locales. Detects:

  • Missing keys — present in reference locale but absent in others
  • Extra keys — present in a locale but not in the reference
  • Structure mismatches — a key is a string in one locale but an object in another
  • Interpolation mismatches — {variable} placeholders differ between locales
  • Empty values — keys with blank translations
  • Unused keys — keys not referenced in source code (requires a list of used keys)

plural_rules

Generate plural form categories for a given locale following CLDR rules. Shows which plural categories the language uses and classifies any test numbers you provide.

LanguageCategories
Englishone, other
Frenchone, other
Russianone, few, many, other
Arabiczero, one, two, few, many, other
Polishone, few, many, other
Japaneseother
Chineseother

format_locale

Format numbers, currencies, dates, and relative times for any locale using the Intl APIs. Supports:

  • Numbers — decimal, percent, unit; compact/scientific/engineering notation
  • Currency — symbol, narrowSymbol, code, and name displays
  • Dates — short, medium, long, full styles with date parts breakdown
  • Relative time — long, short, narrow styles with auto-numeric formatting

Setup

bash
npm installnpm run build

MCP Configuration

json
{  "mcpServers": {    "i18n-tools": {      "command": "node",      "args": ["D:/products/mcp-servers/mcp-i18n-tools/dist/index.js"]    }  }}

License

MIT

Source: README.md at commit 734ad18

Tools

0
SourceWeft has not started this package in its sandbox yet, so its tools are not known.

Version history

1
  1. v1.0.2LatestSep 16, 2026

Score

40% of the applicable checks met

How complete this listing is, computed from the registry entry, the endpoint and public sources. Not a rating of the server and not a statement that it is safe or working today: reachability is a dated check, and no installs or reviews go into the score.

  • Reached in the last 30 days25 pts

    Keep the endpoint answering the MCP handshake; SourceWeft probes it every 30 days.

  • Auth declared10 pts

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  • Tools listed15 pts

    Answer tools/list without a credential, or ship a package that starts in a sandbox without one.

  • DescriptionRequired15 pts
  • Logo10 pts
  • Documentation15 pts
  • License10 pts

    Declare a license in the repository or the registry entry.