Worked on enhancing protocol flexibility within the modelcontextprotocol/ext-apps repository by updating the Host-to-Sandbox communication requirements from MUST to SHOULD. This change allowed for more adaptable message handling and improved interoperability between components, reducing integration friction while maintaining backward compatibility. The update was implemented through a focused change set and thoroughly documented using Markdown, ensuring clarity for future contributors. Emphasizing protocol design and documentation skills, the work aligned the messaging protocol with intended specifications and minimized the impact on downstream systems. No bugs were addressed during this period, with efforts concentrated on delivering this targeted feature enhancement in February 2026.