What happened
On June 30, 2026 the open-source project herdr (repository ogulcancelik/herdr) topped GitHub Trending — #1 in the Rust category and a spot in the overall daily ranking. Within weeks of release the repo had collected nearly 15,000 stars.
The author describes herdr as an "agent multiplexer that lives in your terminal." In practice it is a "tmux for coding agents": where classic tmux splits a terminal into panes, herdr lays out running AI agents across panes — and, unlike tmux, it understands what is actually going on inside them.
Key facts from the sources:
- A single Rust binary, ~10–11 MB. No Electron, no account, no telemetry and no cloud — everything runs locally, including over SSH. Builds exist for Linux, macOS and Windows (beta).
- It detects each agent's state and shows it in the sidebar with four statuses:
working,blocked(waiting for input),done,idle. Detection works off process names and terminal output patterns. - 14+ coding agents out of the box: among them Claude Code, Codex, Copilot CLI, Cursor Agent, Amp, Devin CLI, OpenCode, Droid, Grok CLI, Gemini CLI and others.
- A local socket API: agents can drive herdr themselves — create panes, run commands, read the output of other panes and wait for a state change.
- License AGPL-3.0-or-later (plus a separate commercial license); free for personal and commercial use.
Why it matters
Developers increasingly run not one agent but several in parallel — one refactoring, another writing tests, a third fixing the build. In bare tmux they all look identical: black panes with text scrolling past, and no way to tell who is stuck waiting on your answer and who is still grinding.
herdr targets exactly that pain: an agent is not just "a process in a pane" but an object with a legible state. One glance at the sidebar shows where something is blocked and needs your decision right now, and where you should stay out of the way. That makes parallel agent work manageable — something people previously hacked together with homegrown scripts on top of tmux.
The reception is a signal in itself: hitting #1 on GitHub Trending and tens of thousands of stars for a single developer's project shows that "orchestrating several coding agents" has gone from a niche topic to a mainstream need.
What it means for vibe coding
- For beginners. tmux was always intimidating with its hotkeys; herdr gives you the same "several panes in one window" idea, but purpose-built for AI agents and with clear statuses. A good way in if you have only just started running Claude Code or Codex in the terminal.
- For practitioners. You can keep several agents on one screen and never lose track of the one that hit a question. Everything is local, no cloud and no telemetry — a plus for private code. The single binary installs quickly (shell script, Homebrew, mise).
- For pros. The socket API opens up scenarios where agents spin up helper panes themselves and coordinate with each other — a foundation for multi-agent pipelines inside the terminal. Mind the AGPL-3.0 license: if you want to embed it in a closed product, look at the commercial license.
A sober caveat: the project is only a couple of months old, the Windows build is in beta, and the list of supported agents and statuses will keep changing. Check the repository for current details.
Sources
- GitHub — ogulcancelik/herdr (repository, README, license)
- Bitdoze: Herdr Review — Open-Source Agent Multiplexer (#1 GitHub Trending on June 30, 14+ agents, ~15k stars)
- Tecmint: herdr — CLI Tool for Managing Multiple AI Coding Agents (four states, single Rust binary)
- Shareuhack: herdr Guide — Manage All AI Coding Agents in One Terminal (2026)