Your first sandbox: signing in gh, Claude, Pi, and Hermes
ยท 11 min read
note
Updated on 2026-10-08. Open Harness is now AGRO. This post uses the current names and commands.
AGRO gives each repository one sandbox. The sandbox is an isolated Docker container, and the image contains no agent CLI. The image pins Node and gh. Each agent CLI enters through one command, agro harness install <id>. The catalog includes Claude Code, Codex, Pi, OpenCode, Hermes, and Grok Build.
A useful sandbox needs three steps. First, start the container. Next, install the tools that you use. Then, sign in each agent. This post walks the full first run: start, attach, install, and sign in to gh, Claude, Pi, and Hermes. Then the post starts a second sandbox on the same host and shows what the second sandbox inherits.