- devdesk-state-hook (Claude UserPromptSubmit/PostToolUse/Notification/Stop/ SessionStart/SessionEnd) records whether each session is working, waiting on you or idle; --list carries it. The sidebar shows it, the header shows the current session's state, and a pulsing "needs you" chip jumps to sessions waiting for input. Session refresh no longer depends on the sidebar being open. - `devdesk attach --upload SESSION FILE BYTES` receives a file as base64 terminal input (raw mode, exact length, size-checked, sanitised name) into /var/lib/devdesk/uploads/<session>/. The UI uploads dropped or pasted files and pastes the path into Claude, which attaches images itself. - `devdesk alerts` / `--alerts`: firing and pending Grafana alert rules with severity, instances, summary and a link. The panel's "Ask Claude" types an investigation prompt into the current session. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>