Knowledge mining is an emerging category in AI, which refers to the orchestration of a series of AI services to uncover latent insights in vast amounts of data. Custom skills provide a mechanism for developers to leverage customized rules and logic specific to their industry or organization. By integrating custom skills into an Azure Cognitive Search enrichment pipeline, teams can use the machine learning models they develop to enrich their data further. In this session, we examine the Web API custom skill interface for building custom skills and connecting those to an enrichment pipeline to benefit from the power of custom AI in Azure Cognitive Search.