Anyone running three Claude Code sessions and two Cursor agents at once knows the pain: a forest of terminal tabs, no idea which agent is stuck waiting on you and which is still grinding. Herdr is a Rust-written terminal multiplexer built specifically for that mess. It hit the HackerNews front page on June 29 with 117 points and crossed 8.4k GitHub stars.
What it actually is
Not a GUI, not Electron — a single zero-dependency binary that lives inside your existing terminal. A sidebar shows each agent’s live state (working / blocked / done / idle), auto-detected from process names and terminal output, so you instantly see who needs attention. You get workspaces, tabs, split panes, mouse drag, and detach/reattach to keep agents running in the background. It already speaks 14+ agents, including Claude Code, Copilot CLI, Cursor, and Devin.
The part that matters: an API for agents
Herdr ships a built-in Unix Socket API. An agent can programmatically spawn a workspace, split panes, read another pane’s output, and block until a state changes — so one orchestrator agent can herd a fleet of worker agents with no human in the loop. A CLI reference covers the same commands. That’s the real reason it’s trending: managing parallel coding agents is the new bottleneck, and Herdr is the first tool treating the agents themselves as the user.
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