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String Catalog MCP
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String Catalog MCP

An MCP server for processing Xcode string catalog files, supporting reading, searching, and updating of localized strings in iOS/macOS applications.
Developer toolsLanguage translation#Localization tool#iOS development#String management#Translation assistant.TypeScript
2.5 points
5.1K
Open Site

Overview

Installation

Content Details

Alternatives

What is String Catalog MCP?

String Catalog MCP is a tool designed specifically for iOS and macOS developers. It allows AI assistants (such as Claude) to directly interact with your Xcode string catalog files (.xcstrings). With this tool, you can easily manage the multilingual text of your application, including viewing existing translations, searching for specific strings, adding new translations, and checking the translation quality.

How to use String Catalog MCP?

First, you need to install and configure the MCP server in your development environment, and then use it through an AI assistant that supports MCP (such as Claude Code). After the configuration is completed, you can directly ask questions about localized strings in natural language, and the AI assistant will call the corresponding tools to operate on your string catalog files.

Applicable scenarios

Suitable for iOS/macOS application developers, localization teams, and maintainers of multilingual applications. It is particularly suitable for scenarios that require managing a large number of translated strings, adding support for new languages, checking translation consistency, and batch-updating translations.

Main features

Multilingual management
View and manage all the languages supported in the string catalog, and identify the source language and target language.
Translation statistics
Get detailed translation coverage statistics, including the total number of keys and the completion percentage for each language.
Intelligent search
Search for localized key names by keywords, supporting case-insensitive substring matching.
Batch operations
Support paging to view all key names and handle large string catalog files.
Translation update
Add or update translations, supporting iOS format placeholders (%@, %d, %lld, %f, %1$@, etc.).
Translation quality check
Review the quality, consistency, and correctness of placeholder usage of existing translations.
Advantages
Natural language interaction: You can operate complex localization files by asking simple English questions.
AI-assisted translation: Combine AI capabilities to generate high-quality translation suggestions.
Maintain format: Correctly handle iOS-specific format placeholders to avoid common localization errors.
Batch processing: Support large-scale translation tasks and improve work efficiency.
Quality assurance: Built-in translation review function to ensure translation consistency.
Limitations
Platform-specific: Only support the Xcode string catalog format for iOS/macOS.
Dependent on AI: Need to use an AI assistant that supports MCP.
Learning curve: Need to understand basic MCP configuration and concepts.
File format: Only support the .xcstrings file format and do not directly support the .strings file.

How to use

Install dependencies
First, make sure that Node.js and the pnpm package manager are installed on your system.
Configure the MCP server
Add the string-catalog-mcp server configuration to your MCP configuration file.
Start the AI assistant
Start an AI assistant that supports MCP (such as Claude Code), and the configuration will be automatically loaded.
Start using
Interact with the AI assistant in natural language and ask questions about localized strings.

Usage examples

Add support for a new language to the application
When you need to add Spanish support to your application, you can use this tool to quickly generate all the missing translations.
Translate a specific functional module
When you need to add multilingual support to the settings page, you can batch-translate all the relevant strings.
Check the translation quality
Before releasing the application, review the quality and consistency of the existing translations.
Find specific error messages
When you need to update the translations of all error messages, quickly locate the relevant strings.

Frequently Asked Questions

What file formats does this tool support?
Do I need programming knowledge to use this tool?
Will this tool modify my source code?
Which AI assistants are supported?
How to handle iOS-specific format placeholders?
How large a string catalog file can it handle?

Related resources

Official documentation of the Model Context Protocol
Understand the basic concepts and working principles of the MCP protocol.
Documentation of the Xcode string catalog format
Detailed instructions from Apple on string catalogs.
Claude Code MCP support
How to use the MCP server in Claude Code.
GitHub repository
Source code and latest updates.

Installation

Copy the following command to your Client for configuration
{
  "mcpServers": {
    "string-catalog-mcp": {
      "command": "pnpm",
      "args": ["dlx", "string-catalog-mcp"]
    }
  }
}
Note: Your key is sensitive information, do not share it with anyone.

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