Claude Code 2.1.236 adds a default-model env var and a one-shot idle notice for cross-session messaging
Claude Code changelog·high signal
Version 2.1.236 (Aug 19) introduces ANTHROPIC_DEFAULT_MODEL, which sets the model new sessions start on while still letting a /model pick override and persist, unlike ANTHROPIC_MODEL. It also adds notify_when_idle to cross-session SendMessage, so one session can ask another on the same machine to send a single notice when it next goes idle, with no polling loop. For anyone orchestrating several local sessions, that replaces hand-rolled polling with an opt-in callback.