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herdr (Preview), published by Herdr, Inc., is a persistent terminal runtime designed to host autonomous coding agents, fitting into the developer tools and terminal/session management category. Currently at version 0.9.0-preview.2026-09-08-62431dbd033b, one of six available versions, the software operates as a background server that keeps real terminals alive on a laptop, desktop, or rented server, ensuring that agent work survives events such as closing the laptop lid, dropping the network connection, or restarting the machine. Users can detach and later reattach to sessions from any terminal or over SSH, making it suitable for long-running, unattended agent workflows. Each terminal pane is labeled as working, blocked, or idle, so operators can quickly identify which agent needs attention without manually inspecting every session. Agents themselves interact with herdr through a command-line interface and a socket API, enabling them to spawn new panes, prompt other agents, and wait until a peer agent is genuinely blocked rather than merely idle. The runtime supports the coding agents users already run, including Claude Code, Codex, Cursor, OpenCode, and Grok, without wrapping or replacing them; instead, it takes ownership of their terminals. Primary use cases include running multiple AI coding agents in parallel, coordinating multi-agent workflows, monitoring agent status across sessions, and preserving long-lived development sessions across interruptions. Both keyboard and mouse input are treated as first-class interaction methods, and a plugin system allows panes and workflows to be extended. The application is distributed as a single Rust binary with no Electron dependency, emphasizing a lightweight footprint. As the "(Preview)" designation and 0.x versioning indicate, the software remains in a pre-release stage, and its capabilities and interfaces may evolve before a stable release.
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