Herdr Is tmux for Your Agent Swarm

Herdr is a terminal-based agent multiplexer written in Rust, built for the moment everyone is quietly arriving at: you are no longer running one coding agent, you are running five, and you have lost track of which ones are stuck. It puts a real terminal behind each agent, not an emulated one, and shows you status at a glance with simple color states for blocked, working, done and idle. Workspaces, tabs and panes, mouse support, sessions that survive a disconnect, all from a single ten-megabyte binary.

The clever bit is the local Unix socket API. Agents can orchestrate themselves through it, spawning and managing each other without each one having to reinvent terminal handling and persistence. Herdr owns that infrastructure so the agents do not have to. You get the semantic awareness of who is blocked for free, no config, plus remote access when you want to check the swarm from your phone.

This is part of a category nobody named a year ago and that is now obviously real: the human control plane for a fleet of agents. It rhymes with cmux and the fleet view in Devin Desktop and the cloud agent runners like Grass and Boxes. The shared insight is that parallel agents need a cockpit, a single pane where one person can watch many workers and jump in only where one is stuck. The bottleneck moved from doing the work to supervising the doers.

Dual-licensed AGPL and commercial, latest release v0.7.1 on June 24, climbing fast on GitHub. It is at https://github.com/ogulcancelik/herdr