LSP Tools MCP server

The LSP Tools MCP Server provides Language Server Protocol-like functionality for text analysis, offering features similar to a Language Server but focused on model context operations. It allows you to find regex patterns in files and query which directories the server can access.

Installation

To install the MCP server, follow these simple steps:

npm install
npm run build

Usage

Starting the Server

You need to specify which directories the server is allowed to access when starting it:

# Start the server allowing access to a specific directory
node dist/index.js /path/to/allowed/directory

# Start the server with multiple allowed directories
node dist/index.js /path/to/dir1 /path/to/dir2 /path/to/dir3

Available Tools

find_regex_position

This tool locates regex pattern matches in a file and returns their positions.

Parameters:

• path: The path to the file to search in
• regex: The regular expression pattern to search for

Returns:

• An array of matches with the following properties:
  • match: The matched text
  • line: The starting line (0-indexed)
  • column: The starting column (0-indexed)
  • endLine: The ending line (0-indexed)
  • endColumn: The ending column (0-indexed, exclusive)

list_allowed_directories

This tool lets you check which directories the server is currently allowed to access.

Parameters:

• None

Returns:

• An array of absolute paths to allowed directories

How to install this MCP server

For Claude Code

To add this MCP server to Claude Code, run this command in your terminal:

claude mcp add-json "lsp-tools" '{"command":"node","args":["dist/index.js"]}'

See the official Claude Code MCP documentation for more details.

For Cursor

There are two ways to add an MCP server to Cursor. The most common way is to add the server globally in the ~/.cursor/mcp.json file so that it is available in all of your projects.

If you only need the server in a single project, you can add it to the project instead by creating or adding it to the .cursor/mcp.json file.

Adding an MCP server to Cursor globally

To add a global MCP server go to Cursor Settings > Tools & Integrations and click "New MCP Server".

When you click that button the ~/.cursor/mcp.json file will be opened and you can add your server like this:

{
    "mcpServers": {
        "lsp-tools": {
            "command": "node",
            "args": [
                "dist/index.js"
            ]
        }
    }
}

Adding an MCP server to a project

To add an MCP server to a project you can create a new .cursor/mcp.json file or add it to the existing one. This will look exactly the same as the global MCP server example above.

How to use the MCP server

Once the server is installed, you might need to head back to Settings > MCP and click the refresh button.

The Cursor agent will then be able to see the available tools the added MCP server has available and will call them when it needs to.

You can also explicitly ask the agent to use the tool by mentioning the tool name and describing what the function does.

For Claude Desktop

To add this MCP server to Claude Desktop:

1. Find your configuration file:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json
• Linux: ~/.config/Claude/claude_desktop_config.json

2. Add this to your configuration file:

{
    "mcpServers": {
        "lsp-tools": {
            "command": "node",
            "args": [
                "dist/index.js"
            ]
        }
    }
}

3. Restart Claude Desktop for the changes to take effect