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openharness

Desktop app that runs many coding agents across machines in tmux panes

Website ↗ (opens in a new tab)Repository on GitHub ↗ (opens in a new tab)
Stars
1.4k
License
MIT
Last commit
Nov 2026
Last release
Oct 2026
Language
TypeScript
Stars, last 12 weeks+1,400
7 Aug 2026: 5 stars14 Aug 2026: 12 stars21 Aug 2026: 23 stars28 Aug 2026: 32 stars4 Sept 2026: 38 stars11 Sept 2026: 44 stars18 Sept 2026: 353 stars25 Sept 2026: 937 stars2 Oct 2026: 1,076 stars9 Oct 2026: 1,204 stars16 Oct 2026: 1,275 stars23 Oct 2026: 1,358 stars30 Oct 2026: 1,405 stars

5 on 7 Aug 20261,405 on 30 Oct 2026

From GitHub's daily star counts.

Checked on GitHub.

Overview

Native desktop app (Flutter) and CLI that run Claude Code, Codex, Cursor, OpenCode and other agent CLIs in tmux sessions on your own machines. A per-machine daemon dials out and links machines over end-to-end encrypted WebRTC, with TURN and relay fallbacks. A Store adds domain harnesses such as Blender, KiCad and Typst, each with a live viewer.

Who it is for: Developers running several coding agents across laptops, servers and GPU boxes

Strengths

  • Runs agent CLIs unmodified in tmux, using vendor transcripts and hooks rather than wrappers
  • End-to-end encryption (ChaCha20-Poly1305, X25519); relay forwards ciphertext only
  • Machines link by password with no SSH keys, Tailscale or open ports
  • Whole stack is MIT in one repo: app, CLI, daemon, relay and device firmware

Weaknesses

  • Desktop app targets macOS and Linux only; no Windows build is listed
  • Building from source needs Node 20+, tmux, Xcode and Flutter 3.47+
  • Remote links depend on the vendor's relay and Cloudflare TURN as fallbacks
  • Agent Messages between harnesses is experimental and off by default

What it needs

  • GPU optional
  • Needs tmux, Node.js 20+, Flutter 3.47+ (build from source), Xcode (build from source)
  • Models: Claude Code, Codex, Cursor, OpenCode, Hermes

Quick answers

Is openharness open source?

Yes. Its code is on GitHub under the MIT license.

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