harnss
Desktop client to harness Claude Code, Codex, and other ACP agents with rich UI and tool visualization.
Overview
Harnss is a powerful open-source desktop UI client designed to harness Claude Code, Codex, and any other agent accepting the Agent Client Protocol (ACP). Run multiple AI coding agents side-by-side with rich visualization, MCP integrations, an embedded terminal, git, and a built-in browser.
Features
- Rich Tool Visualization: Tool calls render as interactive UI cards instead of raw JSON logs.
- Multi-engine Sessions: Switch instantly between Claude Code, Codex, or Gemini.
- Embedded Environment: Includes an integrated terminal and browser.
More Harnesss
claude-simone
Structured project management harness for Claude Code — define milestones and sprints in markdown, then run execution loops that drive Claude through each task.
Claude Squad
Multi-agent tmux orchestrator — spawn N isolated Claude Code sessions in parallel, each in its own git worktree, then merge the best results back to main.
Claude Swarm
Distributed Claude agent swarms — agents communicate via MCP, share tool access, and collaborate on complex tasks with configurable topology and role specialization.