Developed an offline local play account system for the UNIkeEN/SJMCL repository, enabling Minecraft player accounts to be created without third-party authentication and supporting seamless LAN-party scenarios. Focused on backend development using Rust, the work introduced a new mcp-server tool that streamlines local account creation and reduces friction for offline play. The implementation emphasized build integrity and maintainable code, with a clear and well-documented commit history. Collaboration was evident through co-authored commits, reflecting shared code ownership. This feature laid the groundwork for future local authentication enhancements, expanding the repository’s capabilities for offline and LAN-based multiplayer experiences.