Language Server MCP

🚀 Language Server - MCP MCP Server

A TypeScript-based MCP server that provides language support for code editing.

This server demonstrates core MCP concepts through features that enhance the code editing experience, such as hover information, code completion, and diagnostics:

• Offers language-specific tools for code analysis and manipulation.
• Integrates the Model Context Protocol for seamless communication.

✨ Features

Language Support

• Provides hover information for symbols in the code.
• Offers code completion suggestions.
• Reports diagnostic information (errors, warnings).
• Tested on TypeScript and theoretically should support Python. We're happy to add other language servers or make the implementation more generic.

MCP Integration

• Implements the MCP protocol to communicate with clients.
• Exposes language features as MCP tools.

Tools

• get_hover: Retrieves hover information at a specific position in the code.
  • Accepts language ID, file path, content, line, and character as required parameters.
• get_completions: Gets completion suggestions at a specific position in the code.
  • Accepts language ID, file path, content, line, and character as required parameters.
• get_diagnostics: Obtains diagnostic information for a document.
  • Accepts language ID, file path, and content as required parameters.

📦 Installation

To use with Claude Desktop, add the server configuration:

On MacOS: ~/Library/Application Support/Claude/claude_desktop_config.json On Windows: %APPDATA%/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "language-server-mcp": {
      "command": "/path/to/language-server-mcp/build/index.js"
    }
  }
}

Debugging

Debugging can be challenging since MCP servers communicate via standard input and output. We recommend using MCP Inspector, which is available as a package script:

npm run inspector

The Inspector will provide a URL to access debugging tools in the browser.

💻 Usage Examples

Basic Usage

# Install dependencies
npm install

# Build the server
npm run build

# Develop with automatic rebuild
npm run watch