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AI browsers are web browsers with built-in AI assistants that can interact with websites using WebMCP. When you register tools via navigator.modelContext, these browser agents can discover and use them automatically.

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Supported Browsers

Chrome AI

Google Chrome’s built-in AI assistant (coming soon)

Perplexity Browser

AI-native browser with search integration

Arc Browser

Browser with AI features and WebMCP support

Edge Copilot

Microsoft Edge with Copilot integration
Browser AI support is actively being developed. Check individual browser documentation for current WebMCP compatibility.

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How It Works

AI browsers have native access to the navigator.modelContext API: When a user asks the browser AI to perform an action:
  1. The AI discovers tools registered on the current page
  2. It selects appropriate tools based on the user’s request
  3. Tools execute in the browser with the user’s session
  4. Results are returned to the AI for response generation

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Preparing Your Website

To ensure your website works with AI browsers:
1

Register your tools

Use navigator.modelContext.registerTool() to expose functionality:
navigator.modelContext.registerTool({
  name: 'search_products',
  description: 'Search the product catalog',
  inputSchema: {
    type: 'object',
    properties: {
      query: { type: 'string' }
    }
  },
  async execute({ query }) {
    const results = await searchProducts(query);
    return { content: [{ type: 'text', text: JSON.stringify(results) }] };
  }
});
2

Add clear descriptions

Browser AIs rely on tool descriptions to understand when to use them. Be specific:
// Good
description: 'Add a product to the shopping cart by product ID and quantity'

// Too vague
description: 'Add to cart'
3

Follow security best practices

Browser AIs run with user permissions. Ensure your tools validate inputs:
async execute({ productId, quantity }) {
  if (quantity < 1 || quantity > 100) {
    throw new Error('Quantity must be between 1 and 100');
  }
  // ... rest of implementation
}

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Testing Without AI Browsers

While waiting for AI browser support, test your tools with:

Embedded Agent

Add a drop-in AI assistant to your site

MCP-B Extension

Test tools via the browser extension

Chrome DevTools MCP

Automated testing with MCP clients

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Security Considerations

AI browser tools execute with the same permissions as your website. They can access localStorage, cookies, and make authenticated requests.
  • Tools inherit the user’s browser session
  • Same-origin policy applies
  • Browser AI will request user permission for sensitive operations

Security Guide

Review comprehensive security guidelines