Introduction "Agent infrastructure should be lightweight, composable, and provider-agnostic." This is the No.60 article in the "One Open Source Project a Day" series. Today, we are exploring OpenHarness . Over the past few articles, we covered OpenAI's Symphony (an agent orchestration spec), Addy Osmani's Agent Skills (an engineering discipline skill set), and Anthropic's Financial Services (a financial industry agent suite). Together, they paint a clear trend: AI agents are evolving from "chat assistants" into "engineering infrastructure that can execute workflows." OpenHarness is an excellent implementation of exactly that infrastructure layer. Built in Python by HKUDS (HKU Data Science Lab) at the University of Hong Kong, it provides four core capabilities—tool-use, skill loading, memory management, and multi-agent coordination—and supports everything from Claude to DeepSeek to a locally running Ollama instance.…