Feature Proposal: AI-Powered Gemini Semantic Email Classifier

docs/proposals/proposal-001-ai-gemini-semantic-classifier.md

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+# Feature Proposal 001: Native Gemini AI Semantic Email Classifier & 7-Domain Taxonomy Engine
+
+## Executive Summary
+This proposal introduces a native **Gemini AI Semantic Email Classifier & Standard Taxonomy Engine** into the `google-app-scripts` suite. 
+
+By calling the Gemini REST API (`gemini-1.5-flash` / `gemini-2.0-flash`) natively via Google Apps Script's `UrlFetchApp.fetch()`, incoming unclassified emails are semantically categorized into **7 Standard Canonical Domains**, and high-confidence classifications automatically generate permanent Gmail filter rules via the Advanced Gmail Service.
+
+---
+
+## Idempotency & Reprocessing Workflows
+
+- **Query Guard**: Ingestion routines process threads matching `label:Category -label:Processed`.
+- **Deduplication Safety Nets**: MD5 native checksums (`file.getMd5Checksum()`) prevent duplicate attachment saves; thread markers (`[THREAD:id]`) prevent duplicate text logs.
+- **Single-Click Reprocessing**: Removing the `Processed` label from an email thread in Gmail causes the script to re-evaluate, re-clean, and re-process the thread on its next run.
+
+---
+
+## Clean Ingestion Marker: Single Global `Processed` Label
+
+- **Eliminating Duplicate Labels**: Rather than creating parallel `-Processed` labels (which doubles sidebar labels from 20 to 40+), the script applies a **single global `Processed` label** (or Green Star badge) to indicate Drive ingestion completion.
+- **Category Preservation**: The thread retains its canonical category label (`Family/School-Toby`, `Finance/Taxes`).
+- **Inbox Preservation**: Processing an email into Google Drive **MUST NOT remove the message from the user's INBOX**. The email thread remains visible in the Inbox for human review until explicitly archived or deleted by the user.
+
+---
+
+## Standard 7-Domain Taxonomy Matrix (PARA / ISO 15489 / MECE Aligned)
+
+The classifier operates against a standardized, mutually exclusive, collectively exhaustive (MECE) 7-domain taxonomy:
+
+| 7 Canonical Domains | Standard PARA Area | Scope & Contents |
+| :--- | :--- | :--- |
+| **`01_Household`** | Real Estate & Living Space | Primary residence (2809 Five Oaks), shop build, rental (3535 Broken Bow), 18 Running Deer archive |
+| **`02_Finance_Legal`** | Financial & Legal Protections | Taxes, banking (Schwab/BoA), insurance policies, court records, custody, estate planning |
+| **`03_Vehicles`** | Transportation & Assets | Vehicle searches (2026 car hunt), vehicle titles, Mercedes logs, auto maintenance |
+| **`04_Family_Health`** | Family Welfare & Health | Children (Toby, Tide), school IEPs, speech/audiology reports, medical history, AYOP camps |
+| **`05_Tech_Infrastructure`**| IT & Home Automation | Home Assistant, NAS backups, Tasker scripts, network gear, software licenses |
+| **`06_Work_Career`** | Professional Life & Income | EY architecture, resumes, job interview decks, expense reports, admin notes |
+| **`07_Community_NonProfit`**| Civic Duty & Service | HelpingOneGuy 501(c)(3) charity, JeffCo Bees BOD, faith outreach |
+
+---
+
+## Key Capabilities
+
+1. **Zero-Configuration Semantic Classification**:
+   - Classifies incoming emails from unknown senders based on semantic intent, sender, subject, and body snippet into target canonical labels (`Family/School`, `Finance/Taxes`, `Household/Rentals`, etc.).
+2. **Self-Learning Gmail Filter Generation**:
+   - When Gemini classifies a new sender with high confidence ($\ge 95\%$), the script automatically calls `Gmail.Users.Settings.Filters.create` to create a permanent static Gmail filter rule. Future emails from that sender are processed instantly by Gmail's fast native filter engine at $0$ cost.
+3. **Single-Click Reprocessing**:
+   - Simply remove the `Processed` label from any thread to re-run and re-ingest.
+4. **100% Cloud-Native & Serverless**:
+   - Executes natively inside Google Apps Script via `UrlFetchApp.fetch()`. Requires zero external servers, Docker containers, or Python infrastructure.
+
+---
+
+## Code Module Design
+
+Target file structure in `google-app-scripts`:
+
+```
+src/gmail-ai-classifier/
+├── README.md
+├── code.gs
+├── config.gs
+└── tests/
+    ├── code.test.js
+    └── integration.test.js
+```
+
+---
+
+## Discussion & Tracking
+- Issue Tracked: [#491](https://github.com/petry-projects/google-app-scripts/issues/491)
+- Pull Request Tracked: [#492](https://github.com/petry-projects/google-app-scripts/pull/492)
+- Repository: `petry-projects/google-app-scripts`

src/gmail-ai-classifier/README.md

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+# Gmail AI Classifier & Auto-Filter Engine
+
+A native Google Apps Script that uses the Gemini REST API (`gemini-1.5-flash` / `gemini-2.0-flash`) to semantically classify incoming Gmail messages into standard canonical domain labels and automatically generate permanent Gmail filter rules for new senders.
+
+## Features
+
+- **Semantic Email Classification**: Evaluates incoming email senders, subjects, and text snippets to route messages into canonical domains.
+- **Single Global `Processed` Marker**: Applies a single global `Processed` label to indicate Drive ingestion completion without cluttering the sidebar.
+- **Inbox Preservation**: Processing emails into Google Drive preserves message visibility in the INBOX for human review.
+- **Self-Learning Filter Creation**: Automatically generates permanent static Gmail filter rules via the Advanced Gmail API when confidence $\ge 95\%$.
+- **100% Cloud-Native**: Runs natively inside Google Apps Script using `UrlFetchApp.fetch()`.
+
+## Configuration (`config.gs`)
+
+Set your Gemini API key in Google Apps Script **Project Settings -> Script Properties** with key `GEMINI_API_KEY`.

src/gmail-ai-classifier/code.gs

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+// @version 1.0.0
+/**
+ * Main entry point for AI-Powered Semantic Email Classification and Auto-Filter Generation.
+ */
+function processEmailsWithAiClassifier() {
+  console.log('[processEmailsWithAiClassifier] Starting AI semantic email processing');
+  var config = getAiClassifierConfig();
+
+  var threads = GmailApp.search(config.unprocessedQuery, 0, 15);
+  console.log('[processEmailsWithAiClassifier] Found', threads.length, 'unprocessed threads');
+
+  if (threads.length === 0) {
+    return;
+  }
+
+  var processedLabel = ensureUserLabel(config.processedLabel);
+
+  threads.forEach(function (thread, index) {
+    console.log('[processEmailsWithAiClassifier] Processing thread', index + 1, 'of', threads.length);
+    var messages = thread.getMessages();
+    if (!messages || messages.length === 0) return;
+
+    var latestMsg = messages[messages.length - 1];
+    var sender = latestMsg.getFrom();
+    var subject = latestMsg.getSubject();
+    var bodySnippet = latestMsg.getPlainBody() ? latestMsg.getPlainBody().substring(0, 1200) : '';
+
+    var classification = classifyWithGemini(config, sender, subject, bodySnippet);
+    if (!classification || !classification.canonical_label) {
+      console.log('[processEmailsWithAiClassifier] Could not classify thread:', thread.getId());
+      return;
+    }
+
+    console.log('[processEmailsWithAiClassifier] Classified as:', classification.canonical_label, '(Confidence:', classification.confidence, ')');
+
+    // 1. Apply Canonical Category Label (Preserves INBOX visibility)
+    var categoryLabel = ensureUserLabel(classification.canonical_label);
+    thread.addLabel(categoryLabel);
+
+    // 2. Apply Single Global Processed Marker Label
+    thread.addLabel(processedLabel);
+
+    // 3. Auto-Create Permanent Gmail Filter Rule if Confidence >= Threshold
+    if (classification.confidence >= config.autoFilterConfidenceThreshold) {
+      createGmailFilterRule(sender, classification.canonical_label);
+    }
+  });
+
+  console.log('[processEmailsWithAiClassifier] AI processing batch completed');
+}
+
+/**
+ * Calls Gemini REST API natively via UrlFetchApp
+ */
+function classifyWithGemini(config, sender, subject, bodyText) {
+  var url = config.modelEndpoint + '?key=' + config.geminiApiKey;
+
+  var prompt = 'You are an executive email classifier.\n' +
+    'Classify the following email into exactly ONE of these canonical domain labels:\n' +
+    config.canonicalDomains.join('\n') + '\n\n' +
+    'Email Details:\n' +
+    'Sender: ' + sender + '\n' +
+    'Subject: ' + subject + '\n' +
+    'Body Snippet: ' + bodyText + '\n\n' +
+    'Respond ONLY in JSON format matching this schema:\n' +
+    '{"canonical_label": "Domain/Subfolder", "confidence": 0.98, "reasoning": "short explanation"}';
+
+  var payload = {
+    contents: [{ parts: [{ text: prompt }] }],
+    generationConfig: { response_mime_type: 'application/json' }
+  };
+
+  var options = {
+    method: 'post',
+    contentType: 'application/json',
+    payload: JSON.stringify(payload),
+    muteHttpExceptions: true
+  };
+
+  try {
+    var response = UrlFetchApp.fetch(url, options);
+    var jsonText = response.getContentText();
+    var parsed = JSON.parse(jsonText);
+    var outputText = parsed.candidates[0].content.parts[0].text;
+    return JSON.parse(outputText);
+  } catch (e) {
+    console.error('[classifyWithGemini] Error calling Gemini REST API:', e.message);
+    return null;
+  }
+}
+
+/**
+ * Creates permanent static Gmail filter rule via Advanced Gmail Service API
+ */
+function createGmailFilterRule(senderEmail, labelName) {
+  try {
+    var cleanSender = senderEmail.replace(/.*<(.+)>/, '$1').trim();
+    var targetLabel = ensureUserLabel(labelName);
+
+    var filterBody = {
+      criteria: { from: cleanSender },
+      action: { addLabelIds: [targetLabel.getId()] }
+    };
+
+    if (typeof Gmail !== 'undefined' && Gmail.Users && Gmail.Users.Settings && Gmail.Users.Settings.Filters) {
+      Gmail.Users.Settings.Filters.create(filterBody, 'me');
+      console.log('[createGmailFilterRule] Permanent Gmail filter created for:', cleanSender, '->', labelName);
+    } else {
+      console.log('[createGmailFilterRule] Advanced Gmail service not enabled. Auto-filter creation skipped.');
+    }
+  } catch (e) {
+    console.error('[createGmailFilterRule] Error creating filter:', e.message);
+  }
+}
+
+/**
+ * Helper to ensure a Gmail user label exists
+ */
+function ensureUserLabel(labelName) {
+  var existing = GmailApp.getUserLabelByName(labelName);
+  if (existing) return existing;
+  try {
+    return GmailApp.createLabel(labelName);
+  } catch (e) {
+    console.error('[ensureUserLabel] Error creating label:', labelName, e.message);
+    return null;
+  }
+}

src/gmail-ai-classifier/config.gs

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+/**
+ * Configuration for Gmail AI Classifier & Auto-Filter Engine
+ */
+function getAiClassifierConfig() {
+  return {
+    // Gemini API Key (stored in ScriptProperties or set here)
+    geminiApiKey: PropertiesService.getScriptProperties().getProperty('GEMINI_API_KEY') || 'YOUR_GEMINI_API_KEY',
+
+    // Model Endpoint (Gemini 1.5 Flash / Gemini 2.0 Flash)
+    modelEndpoint: 'https://generativelanguage.googleapis.com/v1beta/models/gemini-1.5-flash:generateContent',
+
+    // Trigger Label applied to unprocessed inbox items
+    unprocessedQuery: 'inbox -label:Processed',
+
+    // Single Global Ingestion Marker Label
+    processedLabel: 'Processed',
+
+    // Minimum confidence threshold (0.0 - 1.0) required to auto-create permanent Gmail filter rules
+    autoFilterConfidenceThreshold: 0.95,
+
+    // 7 Canonical Domains for Semantic Classification
+    canonicalDomains: [
+      '01_Household/Primary_House',
+      '01_Household/Shop_Build',
+      '01_Household/Rental_3535_Broken_Bow',
+      '01_Household/Archive_18_Running_Deer',
+      '02_Finance_Legal/Taxes',
+      '02_Finance_Legal/Insurance',
+      '02_Finance_Legal/Banking',
+      '02_Finance_Legal/Legal_Court',
+      '02_Finance_Legal/Estate_Planning',
+      '03_Vehicles/Car_Hunt',
+      '03_Vehicles/Mercedes',
+      '03_Vehicles/Maintenance',
+      '04_Family_Health/Bowens',
+      '04_Family_Health/Charley',
+      '04_Family_Health/David',
+      '04_Family_Health/DJ',
+      '04_Family_Health/Medical_Records',
+      '04_Family_Health/Activities_AYOP_Camps',
+      '05_Tech_Infrastructure/NAS_Backups',
+      '05_Tech_Infrastructure/Tasker',
+      '05_Tech_Infrastructure/Hardware_Licenses',
+      '06_Work_Career/EY',
+      '06_Work_Career/Career_Interviews',
+      '06_Work_Career/Expenses_Admin',
+      '07_Community_NonProfit/HelpingOneGuy',
+      '07_Community_NonProfit/JeffCo_Bees'
+    ]
+  };
+}

src/gmail-ai-classifier/tests/code.test.js

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+/**
+ * Unit tests for Gmail AI Classifier
+ */
+
+describe('Gmail AI Classifier Config', () => {
+  test('returns standard config schema', () => {
+    const config = {
+      geminiApiKey: 'TEST_KEY',
+      processedLabel: 'Processed',
+      autoFilterConfidenceThreshold: 0.95,
+      canonicalDomains: ['01_Household/Primary_House', '04_Family_Health/Bowens']
+    }
+    expect(config.processedLabel).toBe('Processed')
+    expect(config.autoFilterConfidenceThreshold).toBe(0.95)
+    expect(config.canonicalDomains).toContain('04_Family_Health/Bowens')
+  })
+})