GitHub Copilot CLI has always run locally and stayed there. The new remote sessions feature, now in public preview, changes that. You can start a CLI session with copilot --remote and it streams live to github.com and the GitHub Mobile apps. From there you can watch what's happening, send steering messages, review and modify plans before they execute, and approve or deny permissions, all without being at the machine running the agent.
Access is via a QR code or link the CLI generates at startup. Sessions are private and only visible to the account that launched them. You can also enable remote on an already-running session with /remote. Mode switching between plan, interactive, and autopilot is available mid-session, so you're not locked into one mode from the start.
The mobile side requires the GitHub Mobile beta. Android users can join via Google Play, iOS via TestFlight. For Copilot Business and Enterprise accounts, an administrator needs to enable the feature first.