herdr has won the battle to become my terminal multiplexer against the other combatants: most notably cmux and tmux. I run it in Ghostty, and its core concepts — spaces, tabs, and panes — map cleanly to projects, longer-running jobs, and temporary open shells. It is mouse-friendly, and just like tmux (but not cmux), can be detached. The most important feature is herdr --remote, allowing me to run most of my long-running workflows on my servers (including my Mac in the office).
To monitor and control agents from the phone, simply install Moshi and use its standard ssh shell to log into the remote host (using its Tailscale IP address), and then type herdr.