AI agents are changing how we build and test software, but the word “harness” can mean very different things depending on the context.
A test harness runs and validates software tests. An agent harness manages an AI agent’s tools, instructions, and execution loop. An evaluation harness measures whether the agent produces correct and reliable results.
Understanding these differences helps teams debug failures, control token usage, and evaluate AI agents more reliably.
Read the full article, including the comparison table, agent loop, evaluation terminology, and a practical Playwright example: https://testdino.com/blog/test-harness-vs-agent-harness
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