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How to run coding agents on several machines in one window with Openharness

Link a laptop and a GPU box so Claude Code and Codex run in one command center.

Remote script. The install step pipes a script from the internet directly into bash, so read it first or pin a trusted version.

Credentials. The remote password you set controls access to the machine, so store it in a password manager and do not share it.

Who it is forA developer with a laptop and a home GPU box who wants agents on both without opening ports or setting up SSH keys.

The problemEach machine has its own agents and terminals, so checking progress means switching between computers.

The outcomeAgents on both machines appear in one app window, and you can open, read, and answer any of them.

What you need first

  • macOS or Linux for the desktop app, downloaded from the Harness site
  • A terminal on each machine you want to link, with curl available
  • A Harness account for the login step
  • Claude Code or Codex installed if you want to run those agents
  • A GitHub clone of this repo, only for building custom harnesses

Steps

  1. Download the Harness app for macOS or Linux from the Harness site.
  2. On the second machine, run curl -fsSL https://harness.autonomous.ai/cli/install.sh | bash.
  3. Run harness login, then harness remote-password set, then harness start on that machine.
  4. In the app, open Machines and choose Link Machine, then enter the password you set.
  5. Start a Claude Code or Codex harness on each machine from the app and check that both appear.

Prompt for your agent

In the openharness repo at autonomous-ai/openharness, follow the Get started section to link the machine <machine-name> to the desktop app. Confirm that the daemon runs with `harness start` and that <machine-name> appears under Machines. Report the machine name and the list of harnesses running on it.

Caveat. Harness is in active development and the README does not say which operating systems the CLI supports beyond the desktop app.

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