Add Chrome AI RTD Provider documentation

dev-docs/modules/chromeAiRtdProvider.md

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+---
+layout: page_v2
+title: Chrome AI RTD Provider
+display_name: Chrome AI RTD Provider
+description: Use Chrome AI APIs for language detection and summarization.
+page_type: module
+module_type: rtd
+module_code : chromeAiRtdProvider
+enable_download : true
+sidebarType : 1
+---
+
+# Chrome AI RTD Provider
+
+## Overview
+
+The Chrome AI RTD Provider is a Prebid.js Real-Time Data (RTD) module that enhances bidding by leveraging Chrome's built-in AI capabilities. It can automatically detect page language using the [Chrome AI Language Detection API](https://developer.chrome.com/docs/ai/language-detection) and generate page summaries or keywords using the [Chrome AI Summarizer API](https://developer.chrome.com/docs/ai/summarizer-api). This information is added to the OpenRTB bid request objects, allowing bid adapters to optimize bids based on content language and context.
+
+## Features
+
+- Automatic language detection using the Chrome AI Language Detection API.
+- Automatic page summarization or keyword generation using the Chrome AI Summarizer API.
+- Caching of detected language and summaries/keywords in localStorage to reduce redundant API calls (configurable for summarizer).
+- Configurable options for both language detection (e.g., confidence threshold) and summarization (e.g., type, format, length).
+- Flexible ORTB2 path configuration for placing detected data.
+- Ability to enable/disable each feature independently.
+- Compatible with the Prebid.js RTD framework.
+
+## Integration
+
+### Build Setup
+
+To include the Chrome AI RTD Provider in your Prebid.js build, use the following command:
+
+```bash
+gulp build --modules=rtdModule,chromeAiRtdProvider
+```
+
+### Basic Integration
+
+Add the Chrome AI RTD Provider to your Prebid.js configuration:
+
+```javascript
+pbjs.setConfig({
+  realTimeData: {
+    dataProviders: [{
+      name: 'chromeAi',
+      waitForIt: true  // Optional: delays the auction until language detection completes
+    }]
+  }
+});
+```
+
+### Advanced Configuration
+
+Configure language detection and summarization with additional options:
+
+```javascript
+pbjs.setConfig({
+  realTimeData: {
+    dataProviders: [{
+      name: 'chromeAi',
+      waitForIt: true, // Set to true if auction should wait for both enabled features
+      params: {
+        languageDetector: {
+          enabled: true,       // Set to false to disable language detection
+          confidence: 0.9,     // Set minimum confidence threshold (0.0 - 1.0)
+          ortb2Path: 'site.content.language' // Default path for language
+        },
+        summarizer: {
+          enabled: false,      // Set to true to enable summarization/keyword generation
+          type: 'headline',    // 'headline','key-points', 'tldr' or 'teaser'
+          format: 'markdown', // 'plain-text' or 'markdown'
+          length: 'short',     // 'short', 'medium', or 'long'
+          ortb2Path: 'site.content.keywords', // Path for summary/keywords
+          cacheInLocalStorage: true // Whether to cache generated summary/keywords
+        }
+      }
+    }]
+  }
+});
+```
+
+## Configuration Options
+
+{: .table .table-bordered .table-striped }
+| Parameter | Scope | Type | Description | Default |
+|-----------|-------|------|-------------|---------|
+| `waitForIt` | Optional | Boolean | Whether to delay auction for data retrieval | `false` |
+| `languageDetector.enabled` | Optional | Boolean | Enable or disable language detection | `true` |
+| `languageDetector.confidence` | Optional | Number | Minimum confidence threshold for detected language (0.0 - 1.0) | `0.8` |
+| `languageDetector.ortb2Path` | Optional | String | Path in ORTB2 to store the detected language | `'site.content.language'` |
+| `summarizer.enabled` | Optional | Boolean | Enable or disable summarization/keyword generation | `false` |
+| `summarizer.type` | Optional | String | Type of summary: `'headline'`, `'key-points'`, `'tldr'`, or `'teaser'` | `'headline'` |
+| `summarizer.format` | Optional | String | Format of the summary: `'plain-text'` or `'markdown'` | `'mark-down'` |
+| `summarizer.length` | Optional | String | Length of the summary: `'short'`, `'medium'`, or `'long'` | `'short'` |
+| `summarizer.ortb2Path` | Optional | String | Path in ORTB2 to store the generated summary/keywords | `'site.content.keywords'` |
+| `summarizer.cacheInLocalStorage` | Optional | Boolean | Whether to cache the generated summary/keywords in localStorage | `true` |
+
+## How It Works
+
+The module initializes configured features (language detection, summarization) asynchronously.
+
+### Language Detection (`languageDetector`)
+
+1. **Data Prioritization**: On initialization or when `getBidRequestData` is called, the module first checks for existing language information in this order:
+   - Auction-specific ORTB2 data (from `reqBidsConfigObj` passed to `getBidRequestData`).
+   - Data cached in localStorage for the current page URL (from a previous detection).
+2. **API Call**: If no language is found and the feature is enabled, it attempts to detect the language of the visible page content using the Chrome AI Language Detection API.
+   - The API's `availability()` method is checked. If 'unavailable', detection is skipped. If 'after-download', the module may proceed if the model downloads.
+3. **Data Handling**: The detected language (if it meets the confidence threshold) is:
+   - Stored in localStorage for future page loads on the same URL.
+   - Added to the OpenRTB bid requests at the configured `languageDetector.ortb2Path` (default: `site.content.language`).
+
+### Summarization / Keyword Generation (`summarizer`)
+
+1. **Data Prioritization**: Similar to language detection, it checks for existing summary/keywords:
+   - Auction-specific ORTB2 data.
+   - Data cached in localStorage (if `cacheInLocalStorage: true`).
+2. **API Call**: If no data is found and the feature is enabled, it attempts to generate a summary/keywords from the page content using the Chrome AI Summarizer API.
+   - The API's `availability()` method is checked. If 'unavailable', summarization is skipped. If 'after-download', the module may proceed.
+3. **Data Handling**: The generated summary/keywords are:
+   - Stored in localStorage (if `cacheInLocalStorage: true`).
+   - Added to the OpenRTB bid requests at the configured `summarizer.ortb2Path` (default: `site.content.keywords`).
+
+If `waitForIt: true` is set in the RTD config, the auction will be delayed until all enabled and available Chrome AI features complete their processing.
+
+## Browser Compatibility
+
+- The browser must support the Chrome AI APIs being used (Language Detection, Summarizer).
+- The specific Chrome AI models (e.g., for language detection or summarization) must be 'available' or become 'available-after-download'. The module handles these states.
+- Sufficient text content must be available on the page (minimum 20 characters for language detection and summarization).
+- If using the `waitForIt: true` option, consider the potential impact on auction latency.
+
+## Limitations
+
+- Relies on browser support for Chrome AI APIs.
+- Requires sufficient and meaningful visible text content on the page for accurate results.
+- Language detection may not be accurate for pages with multiple languages mixed together.
+- Summarization quality depends on the page content and the capabilities of the underlying Chrome AI model.
+
+## Browser Compatibility
+
+[Language Detector API Support](https://caniuse.com/mdn-api_languagedetector)
+## Example Use Cases
+
+### Standard Implementation
+
+```javascript
+pbjs.setConfig({
+  realTimeData: {
+    dataProviders: [{
+      name: 'chromeAi',
+      waitForIt: true
+    }]
+  }
+});
+```
+
+### Disable Language Detection for Specific Sites
+
+```javascript
+pbjs.setConfig({
+  realTimeData: {
+    dataProviders: [{
+      name: 'chromeAi',
+      params: {
+        languageDetector: {
+          enabled: false
+        }
+      }
+    }]
+  }
+});
+```
+
+### Higher Confidence Requirement for Language Detection
+
+```javascript
+pbjs.setConfig({
+  realTimeData: {
+    dataProviders: [{
+      name: 'chromeAi',
+      waitForIt: true,
+      params: {
+        languageDetector: {
+          enabled: true,
+          confidence: 0.95  // Only use high-confidence detections
+        }
+      }
+    }]
+  }
+});
+```
+
+### Enable Summarizer with Custom Settings
+
+```javascript
+pbjs.setConfig({
+  realTimeData: {
+    dataProviders: [{
+      name: 'chromeAi',
+      waitForIt: true,
+      params: {
+        languageDetector: {
+          enabled: false // Example: only using summarizer
+        },
+        summarizer: {
+          enabled: true,
+          type: 'teaser',
+          format: 'markdown', // In markdown format
+          length: 'medium',
+          ortb2Path: 'site.ext.data.summary', // Custom ORTB2 path
+        }
+      }
+    }]
+  }
+});
+```