Solo-built agent runtime Herdr joins Y Combinator, relicenses to Apache-2.0

Herdr, a terminal-native runtime for managing CLI coding agents, is joining Y Combinator’s F26 batch. Its sole developer, Can, describes the tool as a way to give long-running agents first-class primitives in the terminal: panes map to agents, panes group into tabs, and tabs belong to projects, with sessions designed to persist for hours or days and to run on any machine. A bundled text UI ships with the runtime, so installing on a VPS and SSHing in yields a working interface immediately, while a plugin marketplace has drawn a Raycast extension, a Stream Deck integration, an iOS client, and more than 500 community plugins within a month.

The project grew to roughly 25,000 GitHub stars and 340,000 downloads before outgrowing what one person could sustain. To back the company, Can plans to hire a small team focused on keeping the core runtime fast, robust, and portable rather than piling on features. Notably, he recently switched the license from the copyleft AGPL to the permissive Apache-2.0 to encourage unrestricted use, and pledges the runtime will remain free and open.

The stated strategy mirrors a broader tension in the current AI-tooling wave: keep the core deliberately lean and push customization to extensions, while building paid features on top of the same open runtime everyone else can build on. The headline roadmap item is connecting today’s isolated environments—a laptop, a VPS for long jobs, and a sandbox for risky or ephemeral agents—into a single networked fabric, positioning Herdr as orchestration infrastructure for developers who juggle many agents at once.