MCP Config Generator

A command-line tool for generating and updating .mcp.json configuration files interactively.

Installation

Install globally via npm:

npm install -g mcp-json-generator

Usage

Run the tool in the directory where you want to create or update your .mcp.json file:

mjg

Features

• Detects existing .mcp.json files and offers to update or replace them
• Interactive prompts for all configuration options
• Number key bindings for quick menu navigation
• Collects tool information including:
  • Tool name
  • Command to execute
  • Command arguments
  • Environment variables
• Supports adding multiple tools in one session

Workflow

1. The tool checks if .mcp.json exists in the current directory
2. If found, you can choose to update it or create a new one
3. For each tool, you provide:
   • Name
   • Command (e.g., node, python, npx)
   • Arguments (one per line, empty line to finish)
   • Environment variables (key-value pairs, empty key to finish)
4. After each tool, you can choose to add another or finish
5. The configuration is saved to .mcp.json

Example Output

The tool generates a .mcp.json file in this format:

{
  "mcpServers": {
    "my-tool-one": {
      "command": "node",
      "args": [
        "/home/me/my-tool-one/index.js"
      ],
      "env": {}
    },
    "my-tool-two": {
      "command": "node",
      "args": [
        "/home/me/my-tool-two/index.js"
      ],
      "env": {
        "MYENV_ONE": "foo",
        "MYENV_TWO": "foo",
      }
    }
  }
}

Requirements

• Node.js (any recent version)

Notes

• Press Ctrl+C at any time to exit
• Use number keys (1, 2, etc.) to quickly select menu options
• Empty input for arguments or environment variables will finish that section
• The tool will overwrite .mcp.json if you choose to create a new configuration