LSP MCP Server

An MCP (Model Context Protocol) server for interacting with LSP (Language Server Protocol) interface. This server acts as a bridge that allows LLMs to query LSP Hover and Completion providers.

Overview

The MCP Server works by:

1. Starting an LSP client that connects to a LSP server
2. Exposing MCP tools that send requests to the LSP server
3. Returning the results in a format that LLMs can understand and use

This enables LLMs to utilize LSPs for more accurate code suggestions.

Configuration:

{
  "mcpServers": {
    "lsp-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "tritlo/lsp-mcp", "", "", ""
      ]
    }
  }
}

Features# MCP Tools

• get_info_on_location: Get hover information at a specific location in a file
• get_completions: Get completion suggestions at a specific location in a file
• get_code_actions: Get code actions for a specific range in a file
• open_document: Open a file in the LSP server for analysis
• close_document: Close a file in the LSP server
• get_diagnostics: Get diagnostic messages (errors, warnings) for open files
• start_lsp: Start the LSP server with a specified root directory
• restart_lsp_server: Restart the LSP server without restarting the MCP server
• set_log_level: Change the server's logging verbosity level at runtime

MCP Resources

• lsp-diagnostics:// resources for accessing diagnostic messages with real-time updates via subscriptions
• lsp-hover:// resources for retrieving hover information at specific file locations
• lsp-completions:// resources for getting code completion suggestions at specific positions

Additional Features

• Comprehensive logging system with multiple severity levels
• Colorized console output for better readability
• Runtime-configurable log level
• Detailed error handling and reporting
• Simple command-line interface

Prerequisites

• Node.js (v16 or later)
• npm

For the demo server:

• GHC (8.10 or later)
• Cabal (3.0 or later)

License

MIT License