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MCP Tool Builder

An MCP server that empowers LLMs to dynamically create new tools through MCP clients such as Claude Desktop.

Features

• Create new tools by describing them in natural language
  • Requires client restart to use new tools (Claude Desktop)
• New tools are saved as python scriptlets in …\mcp-tool-builder\tools
• New tool definitions are saved in …\mcp-tool-builder\tools\tools.json

Example tools included at installation

• get_bitcoin_price: Fetches current Bitcoin price from CoinGecko
• get_weather_forecast: Gets weather for US ZIP codes (uses geopy)

Creating New Tools

Use the create_tool command in Claude Desktop (or suggest strongly!!) to create new tools dynamically

Installation

1. Clone this repository
2. Install dependencies:

cd mcp-tool-builder
uv venv
.venv\Scripts\activate
uv pip install -e .

Usage with Claude Desktop

Add to claude_desktop_config.json:

{
    "mcpServers": {
        "tool-builder": {
            "command": "uv",
            "args": [
                "--directory", 
                "PATH_TO\\mcp-tool-builder",
                "run",
                "tool-builder"
            ]
        }
    }
}