A developer has implemented the Agent-to-User Interface (A2UI) protocol within Google Apps Script, using Gemini's structured output to render dynamic UIs directly inside Google Sheets. This creates interactive booking forms and event lists without external servers, streamlining workflows.

The approach bypasses the official A2UI's distributed system, which requires an external server and introduces latency. By using `google.script.run`, the code operates entirely within Google's network, offering faster response times. This serverless architecture merges AI with native Workspace tools like Sheets and Calendar.

While this method offers zero setup cost and deep integration, developers must handle the rendering logic manually and navigate GAS execution quotas. The project demonstrates AI's potential to move beyond text chat, delivering actionable, app-like components directly where users work.