Pablo Castro enhanced Azure AI Search capabilities within the Azure/azure-mcp and microsoft/mcp repositories by delivering schema improvements and integrating knowledge base management features. He implemented support for non-retrievable and facetable fields, improved index management granularity, and enabled precise configuration for better search relevance. In addition, Pablo added CLI commands for managing knowledge bases, updated SDK dependencies, and expanded unit testing to ensure reliability across edge cases. Working primarily in C# and leveraging skills in API integration and backend development, he focused on usability, documentation, and robust stream handling, resulting in more efficient data discovery and streamlined developer workflows.