WORK IN PROGRESS - USE WITH CAUTION - Windows
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
Related MCP server: Model Context Protocol Server
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
Clone this repository
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"
]
}
}
}