Mini Harness Python agent harness beats other tools

The author built a custom AI agent harness called Mini Harness using Python to understand how agent loops, tools, and context windows work. Tested against seven other harnesses on Claude Haiku and DeepSeek V4.1 Flash, the ~1,200-line implementation performed strongly across tasks. The article outlines 15 development steps to build a personalized harness for learning or portfolio purposes. Open article →