I18n Tools MCP Server

@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.

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

npm install
npm run build

MCP Configuration

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

License

MIT