The announcement from Vercel and its heavyweight backers suggests a genuine industry effort to avoid the plugin format wars that plagued earlier platform eras. However, the specification's deliberate minimalism—leaving installation, distribution, and user experience to individual clients—means the hard problems of security, permissions, and seamless cross-client interoperability remain unsolved. The real test will be whether this thin common layer can prevent clients from adding proprietary extensions that ultimately lock developers in, rendering the 'portable' promise superficial. Its success hinges on the committee resisting the urge to expand the standard prematurely while the underlying agent ecosystems are still in flux.