Chrome Relay lets coding agents use your signed-in Chrome in background tabs

Chrome Relay is a new open-source tool (MIT licence) for Macs that lets coding agents such as Claude Code, Codex and Cursor drive your everyday Chrome, with your real logins, in hidden background tabs. It works through a Chrome extension and a local relay, so nothing steals focus. Each agent sees only the tabs it opened, and idle agent tabs close after 30 minutes. Only connections with a secret stored on your Mac and coming from an allowed agent app are accepted, and web pages are refused. Agents never type passwords: if a site needs a password, passkey or two-step check, the agent stops and asks you. Every action is logged to a local audit file, with typed text stored only as a character count. The author says plainly it is not a defence against malware already running as you. Setup needs macOS, Chrome, Node.js 20+ and loading the extension by hand.