Herdr Deep Dive — The "tmux for AI Agents": Run Multiple Coding Agents (Claude Code / OpenCode / Codex, etc.) From One Terminal With Persistent Sessions Over SSH and a Mobile-Friendly UI Used by Engineers at JetBrains / Docker / Vercel / Google / NVIDIA / AWS; Rust Binary, No Electron

Herdr is a terminal-based AI coding-agent multiplexer — run multiple AI agents from one UI, with sessions persisted like tmux.

Four takeaways:

1. tmux for agents — run Claude Code / OpenCode / Codex, etc., in independent panes
2. Persistent sessions — agents keep running after the terminal closes; reattach from anywhere
3. SSH + mobile-friendly — operate agents even from a phone or tablet
4. Rust binary — not Electron, no external dependencies; used at JetBrains / Docker / Vercel / Google / NVIDIA / AWS

Reality of running AI coding agents in 2026:

- Each agent in its own terminal — Claude Code here, Cursor there, Codex in yet another window
- Close the terminal, kill the agent — SSH drops during a long task and you restart from scratch
- Hard to check from the road — no visibility into agent progress on a build server
- No unified agent-state view — you have to hop between windows to see what's working, blocked, or done

Herdr's answer: take tmux's "multiplex many shells" structure and reapply it to "multiplex many agents", adding agent-specific state (working / blocked / done / idle).

Run multiple agents in independent panes:
- Pane A: Claude Code on a frontend feature
- Pane B: OpenCode on backend APIs
- Pane C: Codex generating tests
- Pane D: Cursor CLI on refactors

Each pane runs independently; focus moves via pane switching just like tmux.

Agents keep running after you detach:
- SSH drops mid-generation → the agent keeps going server-side
- Reconnect from home to see what finished
- Check progress from the hotel on an iPhone

The tmux resume experience, applied to AI agents — essential now that long-running tasks are normal.

tmux-like but agent-aware:
- SSH into a remote box (prod terminal, GPU cluster, internal dev server) → herdr attach
- All agent sessions show up immediately, state fully synchronized
- Clean separation between where you develop (Tokyo) and where the compute runs (GPU cluster)

Real terminals, not Electron wrappers:
- Clickable pane layouts, mouse support
- Full ANSI escape support (color, decoration, cursor control)
- Each agent runs in its own shell environment — no conflicts with existing CLI tooling

Opposite direction from web-based IDEs (Cursor iOS, Claude Cowork): keep the terminal-native experience.

Sidebar shows every agent's state:
- blocked — waiting on user input (e.g., a Crit.md review comment)
- working — executing, still processing
- done — finished, awaiting review
- idle — waiting

"Which agent do I attend to next?" becomes an instant decision — a foundational productivity win for parallel operation.

Programmatic management:
- Start an agent from the CLI: herdr new claude-code
- Integrate with outside tools via JSON socket API (Slack notifications, monitoring dashboards, etc.)
- Workflows like auto-spawning agents from Cloudflare Durable Objects or Flue Framework become natural

Optimized for terminal access from phones and tablets:
- Responsive UI, SSH → herdr attach from iPhone / Android
- Same direction as Cursor iOS and Claude Cowork mobile — extending the developer's workspace from "desk" to "anywhere"
- Emergency response on the road, progress checks on the commute, one last debug before bed

Design choices:
- Rust backend (src/app/state.rs, src/ui/sidebar.rs, etc.)
- Single-binary distribution, no external deps
- Not Electron — memory footprint measured in tens of MB (Electron-based tools regularly hit 500 MB–1 GB)
- Multi-agent integration — first-class support for Claude Code, OpenCode, Codex, Cursor CLI, and other major CLI agents

Installation: drop the Rust binary in place, run herdr. Customization via a config file similar to .tmux.conf.

Companies using it (from the official site):
- JetBrains (IntelliJ, PyCharm, etc.)
- Docker
- Vercel
- Google
- NVIDIA
- AWS
- and others

Forward-leaning dev teams where parallel agent operation is already routine — plus individual developers up through large teams.

Day-to-day AI-agent operations infrastructure:

Herdr's uniqueness: the only tool that tackles "one person operating many agents at once" — the same problem tmux solved for "many shells" twenty years ago, redefined for the AI-agent era.

(1) Solo dev, parallel projects: front / back / infra as three panes, a different agent for each.

(2) Long-running tasks: hand a multi-hour task ("fix every type error in the monorepo") to Herdr and go out; check progress from the phone.

(3) Team dev servers: each engineer keeps their own Herdr session on a shared dev box, attaches over SSH.

(4) GPU-cluster operations: manage agents running Qwen 3.6-35B or Gemma 4 on high-end GPU nodes.

(5) Ops monitoring: keep Cloudflare / AWS monitoring agents running under Herdr, respond immediately from mobile when something fires.

(1) Terminal-culture ramp: tmux-like UI means a learning curve for people without a tmux / screen background. GUI-first developers may prefer Cursor / Cowork.

(2) Security considerations: persistent sessions live server-side and hold agent state, so secrets like API keys need care. Restrict access to the Herdr server.

(3) Agent dependencies: expect to keep pace with agent API changes. Community activity will decide long-term health.

(4) Resource consumption: many agents in parallel add up in CPU / memory / LLM-API cost. Budget alerts belong in the design.

(5) Team governance: when multiple engineers share one Herdr host, session isolation and permission control need thought.

Herdr is essential infrastructure for the era of parallel AI-agent operations. The tmux idea — solving multiplexing for shells — recast for AI agents. Persistent sessions + SSH + mobile UI let engineers operate many agents, from anywhere, continuously. Combine it with Crit.md (HITL review), Nous Portal (model substrate), and "just Cloudflare it" (infra) and you have a default stack for late 2026.

Related services from us — software development, AI consulting, Hermes Agent setup, and OpenClaw setup. For enterprise AI-agent parallel-operations environments, SSH-server design, or team governance, get in touch.

- Herdr
- Related columns: Crit.md (HITL review), Claude Cowork Web/Mobile expansion, Nous Portal Cloud, Cursor iOS support, Claude Fable 5 return