Worked on the coda/packs-sdk repository to expand data modeling capabilities by introducing a dedicated email parameter type to the SDK. This feature included the creation of new type definitions, parameter mappings, and validation logic to ensure robust handling of email data, supporting both single values and array or sparse array variations. The implementation focused on improving type-safety and data integrity for developers working with email-related inputs in packs. Leveraging TypeScript and applying principles of API design and SDK development, the work enhanced the developer experience by enabling stricter validation and more flexible modeling of email parameters within the SDK.