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AI Agent Evaluation and Testing: How to Build an Eval Harness That Catches Failures Before Users Do

This story is from 2026-08-25. It is preserved in the archive; the latest stories are on the live feed.

Introduction Your AI agent works in the demo. It answers questions, calls tools, completes workflows. Everyone nods. Then it hits production and gives a wrong answer to a customer within the first week. The gap between demo and production is evaluation. An eval harness is infrastructure that tests…

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  1. 2026-08-25 12:39 · DEV Community — AI
    AI Agent Evaluation and Testing: How to Build an Eval Harness That Catches Failures Before Users Do

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