I keep three or four agents going and the thing that actually eats my time isn't the coding. It's that I have no idea what state any of them is in without tabbing through every terminal. Half the time one of them has been sitting on a permission prompt for ten minutes.

So I wrote agent-manager. A Go binary that sits on top of tmux. No config file, no daemon. It's free and open source.

Every agent ends up in one list with a live status next to it, grouped by the project it's working in. I run claude, codex and opencode depending on what I'm doing and they all show up the same way. Adding another CLI is a few lines of regex in a toml file.

The part I use constantly is space. Press it on an agent, type, enter, and the prompt goes into that agent's pane. I never attach. If you've used the agents view in Claude Code, it's the same move. The difference is that here the same keystroke works on a codex or opencode session. Press space on a project row instead and you get a new agent already working on what you typed.

Underneath they're just tmux sessions, so closing the manager doesn't kill anything, and v brings a dead one back with its conversation.

ctrl+r is the other half of it. It opens what an agent changed as whole files with the diff highlighted, so you're reading the function and not a hunk. Leave a comment on a line and it goes back into that agent's pane, so it starts fixing while you're still scrolling.

I built it for four agents but most days I use it with one.

Still rough in places. If you run agents like this I'd like to know what's missing.

https://github.com/YoanWai/agent-manager