Writer and Rewriter API Documentation

Overview

The Writer and Rewriter APIs are part of the built-in AI capabilities in Chrome, allowing users to create and revise content efficiently. The APIs leverage fine-tuned models tailored for specific writing and rewriting tasks.

Features

• Writer API: Create new content based on a given prompt.
• Rewriter API: Revise and restructure existing text.
• Fine-tuned models providing context-based content generation.

Goals of the Early Preview

• Gather feedback on text quality.
• Identify issues in the API's implementation in Chrome.
• Shape the future of the APIs through user feedback.

Requirements

• Supported Platforms: Desktop (Windows, macOS, Linux)
• OS Version and Hardware Requirements (specific details omitted for brevity)
• Current non-support: Chrome for Android, iOS, and ChromeOS

Setup Instructions

1. Prerequisites:
2. Accept Google's Generative AI Prohibited Uses Policy.

3. Download and install Chrome Canary.

4. Enable Chrome Flags for Gemini Nano:

5. Open a new tab and navigate to chrome://flags/#optimization-guide-on-device-model.
6. Set Optimization Guide on Device Model to Enabled BypassPerfRequirement.

7. Relaunch Chrome.

8. Enable the Writer and Rewriter APIs:

9. Enable the Writer API:
   • Go to chrome://flags/#writer-api-for-gemini-nano.
   • Set this flag to Enabled.
10. Enable the Rewriter API:
    • Go to chrome://flags/#rewriter-api-for-gemini-nano.
    • Set this flag to Enabled.

11. Relaunch Chrome after enabling these flags.

12. Verify Setup:

13. Open Chrome DevTools and enter the console command:

    (await ai.languageModel.capabilities()).available;
    

14. Confirm it returns "readily" to ensure the model is available.

Writer API

Purpose

To generate content based on a specific prompt and writing context.

Usage

Example: Pure JavaScript

(async () => {
  const writer = await ai.writer.create({
    tone: "formal",
    format: "plain-text",
    length: "medium",
    sharedContext: "Business email context"
  });

  const result = await writer.write("Draft an email to request a meeting.");

  console.log(result);

  writer.destroy(); // Clean up after the operation
})();

Available Options

• Tone: formal, neutral, casual
• Format: plain-text, markdown
• Length: short, medium, long

Rewriter API

Purpose

To improve and reorganize existing content intelligently.

Usage

Example: Pure JavaScript

(async () => {
  const rewriter = await ai.rewriter.create({
    tone: "more-formal",
    format: "plain-text",
    length: "shorter",
    sharedContext: "Review context"
  });

  const revisedText = await rewriter.rewrite("I liked the product, but it could be better.");

  console.log(revisedText);

  rewriter.destroy(); // Clean up after the operation
})();

Available Options

• Tone: as-is, more-formal, more-casual
• Format: as-is, plain-text, markdown
• Length: as-is, shorter, longer

API Surface

AIWriterFactory

• create: Initialize a writer.
• capabilities: Get the capabilities of the writer.

AIRewriterFactory

• create: Initialize a rewriter.
• capabilities: Get the capabilities of the rewriter.

Activation and Feedback

1. Setup and activation described in the setup section.
2. Feedback: Provide feedback through the given channels for text quality and implementation issues.

Changelog

• Version history detailing updates and changes made to the API.