Server changes: - Allow cancelling connected codes (not just pending) - Reject agent connections with cancelled codes - Periodic cancellation check during active sessions - Send Disconnect message when code is cancelled Agent changes: - Detect cancellation via Disconnect message - Show Windows MessageBox to notify user - Exit cleanly without reconnecting for support sessions 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>