Andy Bell developed two key features across the movementlabsxyz/aptos-core and movementlabsxyz/movement repositories, focusing on reliability and maintainability in blockchain systems. He implemented a feature flag gate for Atomic Bridge operations in Move, ensuring these features only activate when enabled and isolating related tests to prevent interference with transaction-fee logic. In parallel, Andy overhauled contributor documentation using Markdown, introducing a comprehensive Code of Conduct and clear workflows for bug reports, enhancements, and documentation. By consolidating Rust style guidance, he reduced maintenance overhead and improved onboarding for open source contributors, demonstrating depth in protocol development and documentation practices.