macOS Harness

Phone Harness is an open-source harness that lets AI agents such as Claude Code, Codex, or other LLMs control a real iPhone or Android phone without a jailbreak, injected app, Xcode, WebDriverAgent, or on-device installation. It exposes helpers for opening apps, reading screen content, tapping, scrolling, typing, and verifying actions. On iPhone, it uses the macOS iPhone Mirroring window as the transport: screenshots are captured from the window, Apple's Vision framework performs OCR and returns tap-ready coordinates, and HID-level CGEvents provide taps, long presses, drags, flicks, scrolling, Unicode typing, and shortcuts. On Android, it uses ADB over USB or Wi-Fi, combining screenshots with the phone's accessibility tree for text and element bounding boxes. Actions can be verified by capturing the screen again, with the screenshot serving as the ground truth rather than relying on a DOM. Each invocation is self-contained rather than relying on a daemon.

Better Harness is an open-source Harness Engineering platform for coding agents. It analyzes project and, where supported, session evidence around an agent's work rather than only its final code diff, evaluating the Agent Work Loop for issues such as task understanding, validation, delivery control, and retained lessons. It turns supported gaps into prioritized findings linked to their evidence, expected outcomes, repair boundaries, and acceptance checks, and produces host-specific reports in formats including HTML, paired Markdown, or native Canvas reports. The platform also supports defining harnesses as code, running controlled experiments, inspecting evidence, and comparing outcomes across coding-agent hosts such as Claude Code, Codex, Qoder, Cursor, and GitHub Copilot CLI.

CLI-Anything is an open-source toolkit and agent plugin for generating command-line harnesses that make existing software accessible to AI agents. It includes integrations for agent platforms such as Claude Code, Cursor, Pi, OpenCode, Codex, and others, plus CLI-Hub for browsing, installing, updating, and launching published harnesses. Its generator follows a seven-phase workflow: it analyzes a target codebase or software, designs command groups and state handling, implements a Click-based CLI with a REPL and JSON output, plans and writes unit and end-to-end tests, documents the result, and packages it for installation. Generated harnesses are intended to call the real application's backend, create or modify its native project files, and invoke the application for operations such as rendering or export rather than replacing it with a simplified implementation. They provide stateful sessions with undo/redo, command-line help for agent discovery, structured JSON responses, and human-readable output. CLI-Anything is distributed under the Apache License 2.0. Its repository also contains agent skill definitions, platform-specific plugins and installers, generated harnesses for numerous applications, and the CLI-Hub package manager installable with pip.

DeepSeek Harness (dsh) is an open-source agent harness developed by DeepSeek AI. It uses an architecture in which everything is a plugin and is powered by Cordis, whose design is described in “A Programming Paradigm for Spatiotemporal Composability.” The npm package can launch a local Web UI with `npx @deepseek-ai/dsh web`, serving at `http://127.0.0.1:3080` by default and opening the default browser; it can also be built and run from a repository checkout. The project is in developer preview and warns that compatibility-breaking changes may occur. It is licensed under the MIT License, with third-party dependencies and their licenses documented separately.