Building a Multimodal, Suggestion-Based AI Writing Coach with Gemini and Google Docs

Automated excerpt

In this article, I introduce DocuMentor AI, an open-source Google Docs add-on built with Google Apps Script, the Google Docs API (v1), and the Gemini API (gemini-3.8-flash / gemini-4-argon). Gemini AI & Docs API Engine (combining gemini-3.8-flash / gemini-4-argon multimodal reasoning with temporary Gemini File API uploads and Google Docs API v1 batch operations), and 3. In addition to generating this summary during AI proofreading (🚀 Run Proofreading), DocuMentor AI includes a dedicated 🎓 Generate Learning Summary from Suggestions & Comments button (step2_generateLearningSummaryFromExisting).

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