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The LLM Evaluation skill provides a robust framework for measuring and improving the quality of Large Language Model applications. It enables developers to move beyond vibes-based testing by implementing standardized evaluation strategies ranging from classical NLP metrics like BLEU and ROUGE to modern approaches such as LLM-as-Judge and semantic similarity via BERTScore. By integrating automated testing, human annotation guidelines, and statistical A/B testing, this skill helps development teams identify performance regressions, validate prompt engineering improvements, and build production-ready AI systems with measurable confidence.