Anthropic AI Updates: May 19, 2026

1. Claude Code 2.1.144 brings /resume to background sessions and a worktree opt-out

Anthropic. Claude Code 2.1.144 lands the first version of /resume that can pick up background sessions, so a session started with claude --bg or from agent view now shows up alongside interactive sessions in the resume list and is labelled with bg to keep the two surfaces distinguishable. The same release adds worktree.bgIsolation: "none" for users who explicitly want background work to edit the working copy directly without going through EnterWorktree, an escape hatch for repos and workflows where the isolation that landed in earlier 2.1.x releases gets in the way. Smaller adds include elapsed-duration timestamps on background subagent completion notifications (e.g. “Agent completed · 3h 2m 5s”) and a “last updated” column in the /plugin browse and /plugin discover panes so it is easier to tell stale entries apart from actively maintained ones. Source