How do I install OpenHarness?

Install OpenHarness with a single command: npx mdskills install HKUDS/openharness. This downloads the skill files into your project and your AI agent picks them up automatically.

What platforms support OpenHarness?

OpenHarness works with Claude Code. Skills use the open SKILL.md format which is compatible with any AI coding agent that reads markdown instructions.

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OpenHarness

Name: OpenHarness: AI Agent Skill
Brand: HKUDS
Availability: InStock
Author: HKUDS

Official

Ultra-lightweight pure-Python alternative to Claude Code from HKU Data Intelligence Lab. ~98% of Claude Code's core tool capabilities in only 11,733 lines of code. Fully compatible with Anthropic Skills and the Claude Code plugin ecosystem. Supports any OpenAI-compatible model.

by HKUDS

npx mdskills install HKUDS/openharness

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OS-like agent runtime that sits between the model and your application. LobeHub's Chief Agent Operator hires agents from a 273K skill marketplace and runs them 24/7 in the cloud, reporting through Slack, Discord, and other platforms. Model as CPU, context window as RAM.

Hermes Agent

Nous Research's open-source autonomous AI agent. Runs as a persistent daemon on your own infrastructure, connects to 16+ messaging platforms (Telegram, Discord, Slack, WhatsApp), and writes its own reusable skills from experience. Model-agnostic — Anthropic, OpenAI, Google, DeepSeek, Ollama.

OpenClaw

Open-source AI agent framework with a complete runtime, CLI, backend services, and web dashboard. Multi-model support (GPT-4o, Claude, Gemini, DeepSeek) with native Telegram/Discord/WhatsApp integration. Emerged as a Claude Code alternative after Anthropic paywalled third-party tool usage in April 2026.

Claudexor

Multi-harness control plane for Claude Code, Codex, Cursor, and OpenCode. Quota-aware rotation across multiple subscriptions, shared thread state, and local-first execution.

Harness details

Kind: Standalone runtime
UI: CLI
Install: pip
Platforms: macOSLinuxWindows
Capabilities: Session managementContext injectionModel-agnostic

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Cursor, Windsurf, and other agents

npx mdskills install HKUDS/openharness

Claude.ai Web or Desktop

Download the skill as a file, then: Settings → Capabilities → Skills → Upload.

Use the Download button at the top of this page to get SKILL.md, or install via the CLI on supported agents.

Multi-harness control plane for Claude Code, Codex, Cursor, and OpenCode. Quota-aware rotation across multiple subscriptions, shared thread state, and local-first execution.

by razzant

Monet

Harness

Mission Control for Claude Code. Native desktop app to browse, search, and drive Claude Code sessions with live status and diff review.

by zenolab124

Agent Manager