VS Code 1.123 synchronizes agent sessions

Microsoft VS Code 1.123 syncs chat sessions to GitHub accounts including local agent sessions. Chats appear in Agents tab on github.com. Disable via chat.sessionSync.enabled=false.

Agents Window: side-by-side sessions via “Open to the Side”, drag-drop, or Alt+select. Only one active session unless pinned.

1M context window for special models. Multiple parallel agent windows.