Harness GitHub Repositories (2026) · Open Source Tools

#1 Persistent memory for AI coding agents based on real-world benchmarks

A lightweight, powerful framework for multi-agent workflows

An open-source long-horizon SuperAgent harness that researches, codes, and creates. With the help of sandboxes, memories, tools, skill, subagents and message gateway, it handles different levels of tasks that could take minutes to hours.

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

an open-source alternative to the dots, bots and muses of the world, run an office of claude code/codex like agents on your laptop, sandboxes or anywhere, uses your existing subscriptions

An open-source coding agent for your terminal, powered by MiniMax.

Open-source AI agent that operates the Unreal Editor — levels, blueprints, materials, C++.

a13n - Build, run, and manage AI agents at scale on your own infrastructure. Open source, with a built-in harness, durable execution, multi-provider support, and a management console. Built With Love 💜 @converge-ai-labs

The Open Framework for Building Agents

How Python does AI. Agents, realtime voice, image generation, embeddings. Every model, every interface, typed end to end.

The agent flow system for token maxxing.

The TypeScript framework for building modular agents around an immutable event log.

🐧 Unified and Stable RSI Platform

The batteries-included agent harness.

Open-Source Software factory for Open Models

The open-source agent harness - the runtime layer that turns an LLM into a working agent.

Open-source personal AI assistant & Agent Harness. Plans tasks, runs tools and skills, self-evolves with memory and knowledge. Multi-agent, multi-model, multi-channel. Lightweight, extensible, one-line install.

Claude Code, Codex, and multi-agent configuration system: principles, hooks, skills, and workflow patterns for AI-assisted development

One persona, many coding agents. Replace or inject system prompts across codex, claude, opencode, grok, omp, hermes, pi, zcode - with a local web console.

Nexent is a zero-code platform for auto-generating production-grade AI agents using Harness Engineering principles — unified tools, skills, memory, and orchestration with built-in constraints, feedback loops, and control planes.