Jonathan Knowles modernized the Inventory data structure in the swarm-game/swarm repository by refactoring its core logic to use MonoidMap, a functional data structure in Haskell. This change simplified inventory management functions, reduced code complexity, and established a canonical representation for inventory data. By introducing new dependencies and updating lookup and management logic, Jonathan improved data correctness and maintainability while laying a foundation for future scalability and optimizations. The work demonstrated strong skills in functional programming, data structures, and disciplined code review, resulting in clearer data semantics and easier debugging without addressing major bugs during the development period.