Skip to content
mcp/harbor
Grok

umbriel for Grok

io.github.obscuritysrl/umbriel

See and drive a whole Windows machine from Bun — apps, input, screen, OCR, registry, OS — via MCP.

client:Grok transport:stdio runtime:npm

Install umbriel in Grok

.mcp.json (in your project root)

Held in this page only — never stored, logged, or sent anywhere but back to your screen. 

{
  "mcpServers": {
    "umbriel": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "umbriel"
      ],
      "env": {
        "UMBRIEL_PROFILE": "<UMBRIEL_PROFILE>",
        "UMBRIEL_OS": "<UMBRIEL_OS>",
        "UMBRIEL_ALLOW": "<UMBRIEL_ALLOW>",
        "UMBRIEL_DENY": "<UMBRIEL_DENY>",
        "UMBRIEL_CURSOR": "<UMBRIEL_CURSOR>",
        "UMBRIEL_FS_ROOT": "<UMBRIEL_FS_ROOT>",
        "UMBRIEL_TRACE": "<UMBRIEL_TRACE>",
        "UMBRIEL_FFI_TRACE": "<UMBRIEL_FFI_TRACE>",
        "UMBRIEL_AUDIT": "<UMBRIEL_AUDIT>",
        "UMBRIEL_REDACT": "<UMBRIEL_REDACT>"
      }
    }
  }
}

Grok Build reads Claude Code's .mcp.json and Claude Desktop's config unchanged, so a server you have already set up there needs nothing new. The Grok web app and X integration do not take custom servers. Grok docs

umbriel in other clients

umbriel MCP server