I think i built something similar after herdr was released but i can say the reason is at least

tmux is definitely usable but moving between workspaces/repos can be annoying if youre managing mahy many things at once. and difficult to organize. more over having agents manage other agents via tmux can lead to garbled input/output

i havent used codex. claude subagents i think arent the right comparison - the closer comparison would be claude managed agents. but i imagine one reason herdr might be better would be that you’re not stuck in the anthropic ecosystem

It adds some abstractions and a plugin architecture for extensions. I checked it out but ended up not using it. I run my own harness of harnesses over tmux centered around tasks rather than sessions.

I suppose it is just the convenience of having an opinionated app that works with agents out of the box, tmux could be more powerful but similar to vim vs vscode, you need to tune it in.

My question also!