MCP Server Cuts macOS AI Automation Time by 45% and Cost by 85%

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A developer built an MCP server called beans-picker on top of the cua-driver macOS automation tool to make AI-driven UI tasks faster and cheaper. In benchmark tests, tasks completed in a median of 28.1 seconds at $0.060, compared to 49.7 seconds and $0.388 using cua-driver alone — a 1.8x speed gain and 85% cost reduction. The key insight was replacing full accessibility-tree reads with a short list of candidate actions, which a lightweight model called Jev uses to pick the correct UI element. This approach dramatically reduces token usage, with cua-driver-only runs consuming a median of 646,000 Claude tokens per task. Throughout the process, the target app remains in the background, allowing users to continue working on their Mac uninterrupted.

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