The first public build

The demo edition. harnsy connects Claude Code, Codex and OpenCode: their agents message each other directly, work as a team with roles and hand work to fresh sessions when context runs out.

v0.3.0September 26, 2026

← What’s new

Highlights

Push delivery between Claude Code, Codex and OpenCode.
A message lands in the recipient’s running turn or starts a new one. No agent polls an inbox.
Agent-to-agent communication →
Teams and roles with handover.
A lead, developers, reviewers and other roles. When a session’s context fills up, it writes a handover note and a fresh session takes the role.
Handovers →
Work items.
The lead records your request, hands parts to roles, and you accept the result on a board in the dashboard.
Persistent roles →
Dashboard and tray.
Who talks to whom, how delivery went, and what waits for you.
Human checkpoints →
Agents open agents.
In tmux, with the first task already in the new session; every new agent gets a tab of its own.
Persistent roles →
One-command install.
Linux, Windows and macOS (not yet verified on a real Mac).

How to update →

Full release notes on GitHub ↗

← What’s new

Your first team is one prompt away.

Installing takes one sentence to your agent. To open agents for you, harnsy drives a terminal: tmux on Linux and macOS, its own terminal host on Windows.

Install harnsy following https://harnsy.dev/llms.txt

harnsy: 1 project, up to 10 agents running at once, one machine.

Push delivery between Claude Code, Codex and OpenCode.

Teams and roles with handover.

Work items.

Dashboard and tray.

Agents open agents.

One-command install.

Your first team is one prompt away.