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Is Flutter GenUI SDK another protocol?

It provides implementation tools for generative interfaces in Flutter.

Flutter’s GenUI SDK coordinates users, Flutter widgets and agents, turning declarative descriptions into interactive app interfaces. Catalogs define available widgets; a data model holds dynamic state. Flutter introduction

Its repository states that it uses A2UI to represent interface content. Separate protocol expression from client implementation rather than treating the SDK as another peer protocol. Official repository

This also helps explain Web Device: implementation tools take on platform-specific responsibilities without becoming identical to their protocol. The analogy distinguishes protocol from implementation; it does not imply matching responsibilities.

Web Device is Arc’s Web-oriented device implementation. For example, it combines article content with routes, language and theme into a web page and handles the corresponding AUP presentation. This concrete job helps distinguish a platform implementation from its protocol.

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What category mistake should you avoid when comparing Flutter GenUI with AUP?

Flutter GenUI is an SDK and orchestration implementation; AUP is a protocol expression. They are not peer products for a simple checkbox ranking.

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