<h2>What's changed</h2> <ul> <li>Added <code>ANTHROPIC_DEFAULT_MODEL</code> environment variable: sets the model new sessions start on, while a <code>/model</code> pick still overrides it and persists across restarts (unlike <code>ANTHROPIC_MODEL</code>)</li> <li>Added <code>notify_when_idle</code> to cross-session <code>SendMessage</code>: ask another Claude Code session on this machine to send one notice when it next goes idle — opt-in, one-shot, no polling (macOS and Linux)</li> <li>Sandbox: on macOS, wildcard read-deny rules (e.g. <code>**/.env</code>) now take precedence inside allowed re