Terminal coding agents like Claude Code, Codex, and OpenCode can now each run in their own isolated Vercel Sandbox , orchestrated from Herdr , a tmux-style manager that runs them side by side in panes. Nothing an agent runs or edits touches your machine.

When you start an agent, the plugin uploads your project files into a new Sandbox, installs the agent there, and opens a pane connected to it.

The pane works like a local terminal; you type to the agent and watch it work. But it lives in the Sandbox, not on your machine, so you can run several agents at once without slowing anything down.

Two Claude Code agents working in separate Sandboxes, with the local Herdr terminal alongside.

Everything the plugin does is machine-readable. Each action returns its results as JSON, so whatever you can do from a pane, like starting an agent, checking its state, or applying its changes, a script or another agent can do too.

A few safeguards are built in.…