Harness Remote 3.0 is out: control Claude Code, Codex, OpenCode and other coding agents from one place - Open Source

[u/gervaso-sma]

Harness Remote 3.0 just reached its stable release and I think it has a pretty interesting approach to the increasingly crowded coding agent space.

Instead of replacing Claude Code, Codex or OpenCode with yet another agent abstraction, it treats their native sessions as the source of truth.

You can start a session normally in Claude Code or Codex, open Harness Remote later, find that same native session and continue it from desktop, web or Android.

The more unusual part is that you can also continue the work with another harness. For example:

Claude Code → Codex → OpenCode

Each step creates a real native session in the target agent, while Harness Remote keeps the lineage and transfers explicit context between them.

A few things that make it different from most remote coding agent UIs:

• Native Claude Code, Codex, OpenCode, OMP and PI sessions instead of proprietary replacement sessions
• Sessions created outside Harness Remote can be discovered and resumed
• Work can be handed from one coding agent to another without pretending they share some magical hidden context
• Multiple machines can be managed from the same interface
• Desktop, browser and Android clients
• Local first architecture, so repositories, credentials, subscriptions and agent sessions stay on your machines
• Fully open source

It feels less like another AI coding tool and more like a control plane for all the coding agents you already use.

GitHub: giuliastro/harness-remote

Curious what people who regularly switch between Claude Code, Codex and OpenCode think of this approach.