複数のAIエージェントを1画面にまとめるターミナルマルチプレクサ「herdr」herdr is a terminal multiplexer that aggregates the status of multiple AI…

Developers who have adopted AI coding assistants increasingly find themselves running several of them at once, and a tool called herdr aims to make that fragmented workflow easier to manage. Described as a terminal multiplexer that is aware of the state of AI coding agents, herdr gathers tools such as Claude Code, Codex, and Cursor onto a single screen so a developer can see at a glance which agent is still working, which has finished, and which is paused waiting for approval.

The problem it targets will be familiar to anyone using more than one agent in parallel. Each agent typically runs in its own window or application, so the only way to check progress is to open them one at a time. Because these tools operate asynchronously, an agent may have completed its task several minutes ago, or it may be stalled on a prompt asking permission to run a command or modify a file. Until you switch to that specific window, you cannot tell the two situations apart. herdr is designed to collapse that repeated cycle of opening, checking, and closing windows into a single view, reducing the context switching that comes with juggling multiple assistants.

To understand what herdr does, it helps to know what a terminal multiplexer is. A multiplexer lets a single terminal window host multiple independent sessions, usually presented as split panes or switchable tabs, and it keeps those sessions alive even after you disconnect from them. The two best-known examples are tmux and GNU Screen, long-standing utilities that developers and system administrators use to run several shells side by side, monitor long-running processes, or maintain persistent remote sessions over SSH. herdr appears to apply that same foundational idea, but with an added layer: rather than treating each pane as an anonymous shell, it recognizes when a pane is running an AI coding agent and surfaces that agent's status.

That status awareness is the distinguishing feature. Where a conventional multiplexer shows you the raw output of each session and leaves interpretation to you, herdr is positioned to read whether an agent is idle, actively generating, or blocked awaiting a human decision. For teams and individuals who route work across multiple agents, this is potentially the difference between actively supervising a fleet of assistants and passively waiting on them. The tool does not appear to replace the underlying agents or change how they operate; it acts as a coordination surface layered on top of them.

The context for a tool like this is the rapid proliferation of command-line and terminal-based AI coding agents. Claude Code is Anthropic's agentic coding tool that runs in the terminal, Codex is associated with OpenAI's coding models and CLI tooling, and Cursor is widely known as an AI-centric code editor that has expanded into terminal and command-line workflows. Each can be given a task and left to work semi-autonomously, editing files, running tests, and requesting confirmation before taking sensitive actions. As developers combine several of these to parallelize work, the overhead of monitoring them individually grows, which is the gap herdr is trying to fill.

This also reflects a broader pattern in developer tooling, where orchestration and observability layers tend to emerge once a category of underlying tools becomes crowded. Just as tmux and Screen became standard glue for managing many shells, and just as dashboards arose to monitor sprawling microservices, herdr represents an attempt to provide a control plane for multiple AI agents. Whether it becomes a durable part of workflows will likely depend on how reliably it detects agent state across different tools and how well it integrates with the terminal habits developers already have.

For now, herdr is best understood as a focused response to a concrete pain point rather than a sweeping new platform. If you are running only a single agent, a traditional multiplexer or even a plain terminal may be sufficient. But for those coordinating Claude Code, Codex, Cursor, and similar tools simultaneously, the promise of consolidating their statuses into one screen addresses a real and growing source of friction.