Evaluating generative AI solutions is crucial for ensuring coherence, accuracy, and relevance of responses.Microsoft.Extensions.AI.Evaluation package provides libraries for code-level evaluations against language model integrations.Metrics include relevance, truth, completeness, fluency, coherence, equivalence, and groundedness.By quantifying and identifying problematic outputs, AI solutions can be continuously improved for trust and effectiveness.The evaluation process involves instantiating evaluators, executing evaluations, and validating results.An example of setting up a Truth Evaluation using the package is detailed with test code included.The importance of evaluating generative AI responses lies in ensuring quality, reliability, and trust in AI applications.The package helps in systematically assessing important metrics to rectify issues and enhance performance.Continuous evaluation and improvement lead to building trustworthy and responsible AI solutions.Further resources and links are provided for a deeper understanding of evaluation metrics for generative AI.