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Control the macOS desktop
Install with Codex or Claude Copy this prompt, paste it into Codex, Claude, or another assistant, and let it review the skill page and install it for you.
Based on SOC occupation classification
Spawn external coding agents via the Agent Client Protocol (ACP)
Build interactive apps, dashboards, calculators, games, trackers, tools, landing pages, and data visualizations with Preact/TypeScript/CSS
Drive a specific named macOS app via raw input bypassing the Accessibility tree
Manage contacts, communication channels, access control, and invite links
Write, draft, or compose long-form text (blog posts, articles, essays, reports, guides)
Track sent messages awaiting responses across communication channels
| name | computer-use |
| description | Control the macOS desktop |
| compatibility | Designed for Vellum personal assistants |
| metadata | {"emoji":"🖥️","vellum":{"display-name":"Computer Use","activation-hints":["User asks the assistant to click, type, drag, or interact with the macOS GUI directly","User wants control of a desktop app with no CLI or API alternative (games, design tools, visual workflows)","User wants screenshots or visual inspection of what is currently on screen"],"avoid-when":["Task can be done via a more specific skill (gmail, calendar, contacts, terminal-sessions) or a CLI / API call"]}} |
This skill provides the computer_use_* action tools for controlling the macOS desktop. CU tools run through the main agent loop via HostCuProxy.
The skill is internally preactivated for conversations with a connected desktop client.
Tools in this skill are proxy tools - execution is forwarded to the connected macOS client, never handled locally by the assistant.
