MCP2 min

How to use ToolKnife MCP with Claude Desktop

Connect Claude Desktop to 273+ calculation, conversion, and developer tools via MCP. One config block, no install.

Prerequisites

  • Claude Desktop installed
1

Open Claude Desktop settings

Open Claude Desktop and go to Settings (gear icon in the bottom left, or Claude > Settings on macOS). Click on the "Developer" tab, then "Edit Config" to open your MCP configuration file.
2

Add the ToolKnife MCP server

Paste this configuration block into your `claude_desktop_config.json` file. If you already have other MCP servers, add `toolknife` as a new key inside the existing `mcpServers` object.
claude_desktop_config.json
{
  "mcpServers": {
    "toolknife": {
      "type": "streamable-http",
      "url": "https://toolknife.com/api/mcp"
    }
  }
}
3

Restart Claude Desktop

Close and reopen Claude Desktop. You should see a hammer icon indicating MCP tools are available. Claude now has access to 273+ tools across finance, math, health, developer, and more.
4

Try it out

Ask Claude something that requires calculation: "What's my monthly mortgage payment on a $400,000 home at 6.5% for 30 years?" Claude will use the mortgage calculator tool and return an exact result, not an approximation.
5

Optional: Add an API key for higher limits

Without an API key, you get 200 calls/day (free account). For higher limits, create an API key at toolknife.com/dashboard/api-keys and add it to your config.
With API key (Pro: 5,000/day)
{
  "mcpServers": {
    "toolknife": {
      "type": "streamable-http",
      "url": "https://toolknife.com/api/mcp",
      "headers": {
        "x-api-key": "tk_your_api_key_here"
      }
    }
  }
}

Related guides

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Tools used in this guide

mortgage-calculatorbmi-calculatorcompound-interest-calculator

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