MCP Tool Builder
An MCP server that allows LLMs to dynamically create new tools through MCP clients like Claude Desktop.
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
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"
]
}
}
}
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