Andrew Jenkins enhanced the cashapp/misk repository by delivering MCP tooling improvements focused on tool descriptor metadata and interoperability with external SDKs. He introduced a metadata field to the MCP tool interface and updated ListToolsResult responses to include this metadata, aligning with OpenAI Apps SDK requirements. Using Java and Kotlin, Andrew applied skills in API design, backend development, and JSON serialization to standardize tool metadata and improve integration stability. His work addressed the need for richer tool discovery and future extensibility, laying a foundation for metadata-driven tooling enhancements and API standardization. The changes improved developer experience and supported AI-assisted workflows.