Developer explains why he runs AI coding agents on a separate Mac, and how to set one up

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A developer argues that long-running AI coding agents such as Claude Code and Codex are better off on a dedicated computer rather than a primary laptop. Running them on a personal machine causes problems: the agent stops when the laptop sleeps, it executes commands with the user's full permissions next to sensitive credentials, and heavy builds drain CPU and battery. The article compares options including cheap Linux servers, sandboxed containers, an old spare Mac, and rented physical Macs for macOS-only work. It then walks through setup steps such as installing Homebrew, Git, Node.js, and the agents, and recommends using separate credentials rather than reusing personal ones. The author discloses that he builds JustMac, a service that rents Macs, while noting that cheaper alternatives suit many projects.

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