refactor-mcp

A Model Context Protocol (MCP) server that provides powerful refactoring tools for Coding Agents.

Features

This MCP server implements two main tools to assist with code refactoring:

🔧 code_refactor

Performs regex-based search and replace operations across files with advanced filtering capabilities.

Parameters:

• search_pattern (string) - Regular expression pattern to search for
• replace_pattern (string) - Replacement pattern (supports capture groups like $1, $2)
• context_pattern (string, optional) - Only replace matches within this context
• file_pattern (string, optional) - Glob pattern to limit files (e.g., *.js, src/**/*.ts)

Example:

// Replace foo() calls with bar() calls
code_refactor("foo\\((.+)\\)", "bar($1)")

// Before: let k = foo(1,2,3);
// After:  let k = bar(1,2,3);

Context-aware refactoring:

// Only replace "legacy_sdk" within import statements
code_refactor("legacy_sdk", "brand_new_sdk", "import")

🔍 code_search

Searches for regex patterns and returns file locations with precise line numbers.

Parameters:

• search_pattern (string) - Regular expression pattern to search for
• context_pattern (string, optional) - Filter matches by surrounding context
• file_pattern (string, optional) - Glob pattern to limit search scope

Example:

code_search("foo\\(.+\\)")

// Result:
// ./src/utils.js (line: 15)
// ./src/helpers.ts (lines: 23-27)

Installation

Quick Start

# Install globally
npm install -g @myuon/refactor-mcp

# Or run directly with npx
npx @myuon/refactor-mcp@latest

For Development

# Clone and install dependencies
git clone https://github.com/myuon/refactor-mcp.git
cd refactor-mcp
npm install

Usage

Development

npm run dev          # Run server in development mode
npm run build        # Build for production
npm start            # Run built server

Code Quality

npm run check        # Run all quality checks
npm run lint         # Run ESLint
npm run format       # Format code with Prettier
npm test             # Run tests

MCP Integration

This server uses the Model Context Protocol to communicate with compatible clients. It runs via stdio transport and can be integrated into any MCP-compatible environment.

Claude Code Integration

For Claude Code users, you can easily add this MCP server with:

claude mcp add refactor npx @myuon/refactor-mcp@latest

Manual Configuration

Add to your MCP client configuration:

{
  "mcpServers": {
    "refactor-mcp": {
      "command": "npx",
      "args": ["@myuon/refactor-mcp@latest"]
    }
  }
}

Alternative Configuration (Local Installation)

{
  "mcpServers": {
    "refactor-mcp": {
      "command": "refactor-mcp"
    }
  }
}

Architecture

• Framework: Model Context Protocol SDK for TypeScript
• Runtime: Node.js with ES modules
• Validation: Zod schemas for type-safe input validation
• File Operations: Native fs module with glob pattern matching
• Testing: Vitest with comprehensive test coverage

Contributing

1. Install dependencies: npm install
2. Run tests: npm test
3. Check code quality: npm run check
4. Build: npm run build

License

MIT