Bun Uia vs Agentfenster

In-depth architectural comparison of the Bun Uia and Agentfenster MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

Choose Bun Uia when:

• You need dedicated capabilities in the OS Automation domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore Bun Uia Details

Choose Agentfenster when:

• You need dedicated capabilities in the OS Automation domain.
• You prefer remote streaming HTTP/SSE transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore Agentfenster Details

Feature & Specification Comparison

Specification	Bun Uia OS Automation	Agentfenster OS Automation
Summary	Playwright for the Windows desktop, from Bun — drive native GUIs via UI Automation + MCP.	Windows GUI automation on a hidden second desktop, driven from Claude Code over MCP.
Category & Scope	OS Automation	OS Automation
Quality signal

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "bun-uia": {
      "command": "npx",
      "args": [
        "-y",
        "bun-uia"
      ]
    }
  }
}

{
  "mcpServers": {
    "agentfenster": {
      "url": "https://agentfenster.com/mcp"
    }
  }
}

Related MCP Server Comparisons