Claude Desktop

1. In Claude Desktop, open Settings → Developer and click Edit Config. This opens claude_desktop_config.json.

2. Add costcrunch under mcpServers, with your API key:

   {
     "mcpServers": {
       "costcrunch": {
         "command": "uvx",
         "args": ["--from", "costcrunch", "cost", "mcp"],
         "env": { "COSTCRUNCH_API_KEY": "cc_live_..." }
       }
     }
   }
   

   If the file already has other servers, add the "costcrunch": {...} entry next to them.

3. Save the file and quit and reopen Claude Desktop.

CostCrunch now shows in the tools menu of the message box. Ask a question about your purchasing data to try it.

If Claude can't find uvx, put its full path in "command". Find it with which uvx in a terminal (for example /opt/homebrew/bin/uvx).