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mcp-tool-builder

by hanweg

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

  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" ] } } }

Screenshot 2024-12-24 105318

image

Install Server
A
security – no known vulnerabilities
A
license - permissive license
A
quality - confirmed to work

local-only server

The server can only run on the client's local machine because it depends on local resources.

MCP server that builds itself by creating new tools as needed based on user requests (Requires restart of Claude Desktop to use newly created tools).

  1. MCP Tool Builder
    1. Features
    2. Example tools included at installation
    3. Creating New Tools
    4. Installation
    5. Usage with Claude Desktop

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