Umbriel

Overview

Umbriel is a Model Context Protocol server that lets you see and control an entire Windows machine through Bun, providing access to apps, input, screen, OCR, registry, and OS-level operations via MCP. By speaking the Model Context Protocol, AI assistants can use Umbriel as a set of callable tools, eliminating the need to copy-paste between applications.

The server runs locally on your machine through the npm package umbriel, which communicates over stdio. No credentials are required—it works out of the box. The latest release is v1.14.0, published under the MIT license with source code available at ObscuritySRL/umbriel on GitHub.

Umbriel is listed in the Development category on mcp.site and works with MCP clients including Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, and Zed. If you maintain Umbriel, claim this listing to verify ownership and keep information current.

Installation

// claude_desktop_config.json
{
  "mcpServers": {
    "umbriel": {
      "command": "npx",
      "args": [
        "-y",
        "umbriel"
      ]
    }
  }
}