THE IMPORTANCE OF AGENT HARNESS IN 2026

Summary from the TLDR newsletter

An Agent Harness is the infrastructure that wraps around an AI model to manage long-running tasks. It is the system that governs how the agent operates. Agent harnesses turn vague, multistep agent workflows into structured data that can be logged and graded to improve systems. They can be used to validate real-world progress, empower the user experience, and improve models via real-world feedback.