Worked on the graphql-hive/gateway repository to address a critical issue in GraphQL cross-subgraph delegation, focusing on preserving inline fragment wrappers to maintain accurate type context for unavailable fields. The solution involved updating the extractUnavailableFieldsFromSelectionSet function in TypeScript to ensure that type information is not lost during delegation, thereby reducing runtime errors and improving query correctness. Comprehensive test coverage was added to validate the preservation of inline fragments across multiple scenarios, strengthening regression safeguards. This work enhanced the reliability and stability of cross-subgraph delegation, leveraging skills in GraphQL, TypeScript, and testing to improve developer productivity and supportability.