Semantic Code MCP Server

This is a Model Context Protocol (MCP) server that provides semantic code analysis capabilities using the Language Server Protocol (LSP).

Features

• Semantic Navigation: Go to definition, find references, hover info.

• Relationship Analysis: Check if function A calls function B (using LSP references).

Related MCP server: Codex LSP Bridge

Architecture

This server acts as a bridge between MCP and LSP. It spawns a typescript-language-server instance and translates MCP tool calls into LSP JSON-RPC requests.

Tools

• get_definition: Find where a symbol is defined.

• get_references: Find all usages of a symbol.

• search_in_file: Search for a string in a file to find its line and character position.

• check_function_call: Analyze if one function calls another.

Usage

Installation

1. Clone the repository:

   git clone git@github.com:thousandmiles/lsp-mcp-server.git
   cd lsp-mcp-server

2. Run the setup script to build the project and generate the configuration:

   ./setup.sh

3. Copy the output JSON and paste it into your MCP client configuration file.

Manual Setup

1. Install dependencies and build:

   npm install
   npm run build

2. Configure your MCP client (e.g. Claude Desktop) to run this server:

   {
     "mcpServers": {
       "semantic-code": {
         "command": "node",
         "args": ["/path/to/code_node/build/index.js"]
       }
     }
   }