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mcp-tool-builder

mcp-tool-builder

by hanweg
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Local

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: my-mcp-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

  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

Available Tools

4 tools
create_toolC

Create a new Python tool with specified functionality

Inputs: tool_name (required), description (required), code (required).

get_bitcoin_priceA

Gets current Bitcoin price in USD from CoinGecko API

Inputs: no named parameters.

get_weather_forecastC

Retrieves weather forecast for a given ZIP code using NWS API

Inputs: zip_code (required).

list_available_toolsB

List all currently available tools

Inputs: no named parameters.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

Loading tool schema changelog…

    Deploy Server
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    TDQS

    B3/5.0

    Scored across 4 tools

    Disambiguation3/5

    The tools have distinct purposes (tool creation, Bitcoin price, weather forecast, tool listing), but the domain is unclear—'create_tool' and 'list_available_tools' suggest a tool management server, while the other two are unrelated utilities. This mismatch could confuse agents about the server's scope, though individual tools are not directly overlapping.

    Naming Consistency4/5

    Three tools follow a consistent verb_noun pattern (create_tool, get_bitcoin_price, get_weather_forecast), but 'list_available_tools' uses 'list' instead of 'get', breaking full consistency. Overall, naming is mostly predictable and readable with only minor deviation.

    Tool Count3/5

    With 4 tools, the count is reasonable for a small utility set, but it feels thin for a 'tool-builder' server that might imply more comprehensive tool management. The inclusion of unrelated utilities (Bitcoin, weather) makes the scope ambiguous, affecting appropriateness.

    Completeness2/5

    If the domain is tool management, there are significant gaps: no update, delete, or test tools, and the unrelated utilities don't fit. If it's a general utility server, coverage is sparse and random. In either case, the surface is incomplete for coherent agent workflows.

    Maintenance

    ActivityInactive
    ResponsivenessNo recent community issues

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