Awesome Harness Engineering

DeepSeek Harness: Everything is a Plugin.

Build Agentic workflows, RAG pipelines, with rich AI model and tool support on one collaborative workspace. Deploy on cloud, VPC, or self-hosted, so teams move from prototype to production without rebuilding the stack.

Lightweight coding agent that runs in your terminal

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.

Orca is the ADE for working with a fleet of parallel agents. Run any coding agent with your own subscription. Available on desktop, mobile and remote runtime.

The Memory Layer for AI Agents - Drop-in memory infrastructure for AI agents and apps. Context that persists. Built for production.

Context7 Platform -- Up-to-date code documentation for LLMs and AI code editors

an open source, extensible AI agent that goes beyond code suggestions - install, execute, edit, and test with any LLM

Teams-first Multi-agent orchestration for Claude Code

🪢 Open source agent evals & observability: Trace, evaluate, and improve LLM applications with one open platform.

A reliable coding agent for complex software engineering tasks.

Composio powers 1000+ toolkits, tool search, context management, authentication, and a sandboxed workbench to help you build AI agents that turn intent into action.

Mastra is the modern TypeScript framework for AI-powered applications and agents.

The AI Toolkit for TypeScript. From the creators of Next.js, the AI SDK is a free open-source library for building AI-powered applications and agents

Debug, evaluate, and monitor your LLM applications, RAG systems, and agentic workflows with comprehensive tracing, automated evaluations, and production-ready dashboards.

Scale computer-use 2.0 with open-source drivers, cross-OS fleets, and benchmarks for training, evaluation, and data generation.

Context window optimization for AI coding agents. Sandboxes tool output (98% reduction), persists session memory, and enforces routing across 17 platforms via MCP + hooks.

OpenWiki is a CLI that writes and maintains agent documentation for your codebase.

AG-UI: the Agent-User Interaction Protocol. Bring Agents into Frontend Applications.

The best agent harness.

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

Build your own AI SRE agents. The open source toolkit for the AI era.

AI Observability & Evaluation

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

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.

The sandbox agent framework.

Deepsec is a security harness for finding vulnerabilities in your codebase powered by coding agents

Kimi Code CLI — The Starting Point for Next-Gen Agents

Self-hosted control plane for AI agents: dispatch tasks, review runs, track spend, and operate OpenClaw, Claude Code, Codex, and other runtimes.

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

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

Next Generation Agentic Proxy for AI Agents and MCP servers

The missing DevTools for Claude Code — inspect session logs, tool calls, token usage, subagents, and context window in a visual UI. Free, open source.

The World's First Virtual Terminal for AI Agents

Skills, MCP servers, Custom Agents, Agents.md for SDKs to ground Coding Agents

Open-source AI agent harness in native Rust — GUI, CLI, headless, and webapp from one binary. Multi-provider, MCP, skills, plugins, agent teams.

Weave is a toolkit for developing AI-powered applications, built by Weights & Biases.

React components for visualizing traces from AI agents

Build your own coding agent workshop - Feb 19th 2026

Open HTTP protocol for human decisions in AI agent workflows. Service-hosted reviews, structured approvals, selections and forms, with optional messenger actions.