Dev Tools · 1h ago
131-Test Eval Harness Catches AI Agent Giving Banned Financial Advice
An AI agent passed all unit tests but still gave financial advice it was instructed to avoid. A developer built a 131-test evaluation harness across four layers, costing $0.03 per run, that caught the semantic failure. The harness tests properties like refusal to give regulated advice, not just string matches.
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The story underscores a growing gap between traditional unit testing and the probabilistic behavior of LLM agents, making eval harnesses a necessary tool for production AI.
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I Built a 131-Test Eval Harness Before Writing New Features. Here's the Silent Failure It Caught. →
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