VSCode LSP MCP

🔍 Overview

VSCode LSP MCP is a Visual Studio Code extension that exposes Language Server Protocol (LSP) features through the Model Context Protocol (MCP).

Extension ID: cjl.lsp-mcp — open Extensions (Ctrl+Shift+X / Cmd+Shift+X) and search for cjl.lsp-mcp to find this plugin precisely.

This allows AI assistants and external tools to utilize VSCode's powerful language intelligence capabilities without direct integration.

🌟 Why This Extension?

Large language models like Claude and Cursor struggle to understand your codebase accurately because:

• They rely on regex patterns to find symbols, leading to false matches

• They can't analyze import/export relationships properly

• They don't understand type hierarchies or inheritance

• They have limited code navigation capabilities

This extension bridges that gap, providing AI tools with the same code intelligence that VSCode uses internally!

Related MCP server: MCP Server

⚙️ Features

• 🔄 LSP Bridge: Converts LSP features into MCP tools

• 🔌 Multi-Instance Support: Automatically handles port conflicts for multiple VSCode windows

• 🧠 Rich Code Context: Provides accurate symbol information through LSP

• ☕ Java dependency source: Get decompiled Java class source via jdt:// URI (from jdtls), so AI can read library implementations

🛠️ Exposed MCP Tools

📋 Configuration

🔗 Integration with AI Tools

Cursor

Config file: ~/.cursor/mcp.json (e.g. %USERPROFILE%\.cursor\mcp.json on Windows)

{
  "mcpServers": {
    "lsp": {
      "url": "http://127.0.0.1:9527/mcp"
    }
  }
}

OpenCode

Config file: ~/.config/opencode/opencode.jsonc

{
  "mcp": {
    "lsp-mcp": {
      "type": "remote",
      "url": "http://127.0.0.1:9527/mcp",
      "enabled": true
    }
  }
}

Claude Code

Config file: ~/.claude.json

{
  "mcpServers": {
    "lsp-mcp": {
      "type": "http",
      "url": "http://127.0.0.1:9527/mcp"
    }
  }
}

Gemini | IFlow

Config file: ~/.gemini/settings.json

{
  "mcpServers": {
    "lsp-mcp": {
      "type": "streamable-http",
      "httpUrl": "http://127.0.0.1:9527/mcp"
    }
  }
}

Roo Code

{
  "mcpServers": {
    "lsp": {
      "type": "streamable-http",
      "url": "http://127.0.0.1:9527/mcp",
      "disabled": false
    }
  }
}

💻 Development

• Clone the repository

• Run pnpm install

• Run pnpm run update to generate metadata

• Press F5 to start debugging