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Claude Desktop uses a single JSON config file. Edit it manually or through the Settings UI.

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Via the UI

Open Settings > Developer > Edit Config. Claude Desktop opens your default JSON editor on the config file.

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File locations

OSPath
macOS~/Library/Application Support/Claude/claude_desktop_config.json
Windows%APPDATA%\Claude\claude_desktop_config.json
Linux~/.config/Claude/claude_desktop_config.json

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Config

{
  "mcpServers": {
    "versuno": {
      "command": "npx",
      "args": ["-y", "versuno-mcp"],
      "env": {
        "VERSUNO_API_KEY": "uk_live_xxx"
      }
    }
  }
}
If you already have other MCP servers configured, add the versuno block alongside them. Do not replace the full mcpServers object.

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Restart

Claude Desktop only reads the config on startup. Quit the app fully (menu bar, not just the window) and reopen it.

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Verify

Open a new chat. You should see a tool icon in the input area indicating MCP tools are available. Click it to see the list. Versuno should contribute 5 tools.

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Troubleshooting

Claude Desktop shows MCP errors under Settings > Developer > MCP. Check the server status there. See the generic Troubleshooting guide for common causes.