Awesome Agent Harness

"OpenHarness: Open Agent Harness with a Built-in Personal Agent--Ohmo!"

Secure, Fast, and Extensible Sandbox runtime for AI agents.

Eigent: The Open Source Cowork Desktop - Local and Free Alternative to Claude Cowork and Codex

Harness engineering beginner tutorial, from 0 to 1

Autonomous multi-session AI coding

Orchestrate multiple coding agents from desktop and mobile

Open-source, secure environment with real-world tools for enterprise-grade agents.

The best agent harness.

Use Claude Code, OpenCode, Cursor CLI, and Codex on mobile and web with CloudCLI (aka Claude Code UI). CloudCLI is a free open source webui/GUI that helps you manage your Claude Code session and projects remotely.

The all-in-one, open-source backend platform for agentic coding. InsForge gives your coding agent database, auth, storage, compute, hosting, and AI gateway to ship full-stack apps end-to-end.

Code Editor for the AI Agents Era - Run an army of Claude Code, Codex, etc. on your machine

One portable memory layer for every AI agent: local-first, Markdown-native, user-owned, and self-evolving across apps, tools, and workflows.

IronClaw is an Agent OS focused on privacy, security and extensibility

Multiplayer agent harness for work

TensorZero is an open-source LLMOps platform that unifies an LLM gateway, observability, evaluation, optimization, and experimentation.

Multi-Agent Harness for Production AI

AI Observability & Evaluation

Secure, Fast, and Extensible Sandbox runtime for AI agents.

Instant, Concurrent, Secure & Lightweight Sandbox for AI Agents.

Visual testing tool for MCP servers

🤗 ml-intern: an open-source ML engineer that reads papers, trains models, and ships ML models

AI Agent Engineering Platform built on an Open Source TypeScript AI Agent Framework

The fullstack MCP framework to develop MCP Apps for ChatGPT / Claude & MCP Servers for AI Agents.

An Open-Source Asynchronous Coding Agent

Multi-platform SDK for integrating GitHub Copilot Agent into apps and services

Omnigent is an open-source AI agent framework and meta-harness: orchestrate Claude Code, Codex, Cursor, Pi, and custom agents — swap harnesses without rewriting, enforce policies and sandboxing, and collaborate in real time from any device.

Specification and documentation for the Model Context Protocol

The sandbox agent framework.

Flexible and powerful framework for managing multiple AI agents and handling complex conversations

Agentic orchestrator for parallel coding agents — plans tasks, spawns agents, and autonomously handles CI fixes, merge conflicts, and code reviews.

Orchestrate sandboxed coding agents in TypeScript with sandcastle.run()

Build an agent harness and control it end-to-end. Open-source SDK for production AI agents in Python & TypeScript - any model, any cloud.

🧱 easy fast local-first microVM runtime and library

TypeScript AI agent orchestration framework with dynamic workflows. Describe the goal, not the graph: a coordinator plans the task DAG at runtime and runs it on any LLM (Claude, ChatGPT, Gemini, DeepSeek, or local models).

可私有部署的多租户知识智能体平台：统一 RAG、知识图谱、多智能体、MCP/Skills、沙盒与权限管理。Self-hosted knowledge agent platform for RAG, knowledge graphs and multi-agent workflows.

🧊 Open source LLM observability platform. One line of code to monitor, evaluate, and experiment. YC W23 🍓

Next-generation AI Agent Optimization Platform: Cozeloop addresses challenges in AI agent development by providing full-lifecycle management capabilities from development, debugging, and evaluation to monitoring.

Orchestration layer for coding agents (Claude Code, Codex)

All-in-One Sandbox for AI Agents that combines Browser, Shell, File, MCP and VSCode Server in a single Docker container.

Open-source All in One AI agent workspace. Run any agent — Claude Code, Codex — across your tools (100+ integrations + MCP), apps, browser, and files, with shared memory. Built-in models or BYOK.

Build and deploy AI Agents on Cloudflare

ByteRover CLI (brv) - The portable memory layer for autonomous coding agents (formerly Cipher)

Self-hosted, open-source agent skill registry for enterprises. Publish & version skill packages, govern with RBAC and audit logs, deploy on-premise with Docker or Kubernetes.

Agenta is a workspace where you and your team build agents and automations.

Latitude is the open-source AI monitoring platform.

Your agent in your terminal, equipped with local tools: writes code, uses the terminal, browses the web. Make your own persistent autonomous agent on top!

Next Generation Agentic Proxy for AI Agents and MCP servers

An AI Gateway, registry, and proxy that sits in front of any MCP, A2A, or REST/gRPC APIs, exposing a unified endpoint with centralized discovery, guardrails and management. Optimizes Agent & Tool calling, and supports plugins.

Cascading runtime for AI agents. Optimize cost, latency, quality, and policy decisions inside the agent loop.

Real-time transport layer for Java AI agents. Build once with @Agent — deliver over WebSocket, SSE, gRPC, and WebTransport/HTTP3. Talk MCP, A2A and AG-UI.