John Hart authored and published a deprecation notice for Office Add-in development in Visual Studio, updating the OfficeDev/office-js-docs-pr repository to align with the upcoming Visual Studio 2026 roadmap. He used Markdown and technical writing skills to clearly communicate the transition, providing developers with detailed migration guidance and alternative project creation tools. His work focused on documentation, ensuring that the deprecation timeline and recommended actions were unambiguous and accessible. By proactively addressing potential confusion, John improved the developer experience and minimized disruption. The scope was limited to a single feature, reflecting a targeted but thorough approach to technical documentation.