feat: add tool get cookie

[KhanhPham2411]

🍪 Add Cookie Retrieval Tool to MCP Chrome Server

📋 Summary

This PR adds a new chrome_get_cookie tool to the MCP Chrome Server, enabling AI assistants to retrieve cookies from specified websites through the Model Context Protocol.

✨ New Feature

• Tool Name: chrome_get_cookie
• Purpose: Retrieve all cookies from a specified website domain
• Input: URL of the target website
• Output: Structured cookie data and formatted cookie string

🔧 Technical Changes

1. Shared Package Updates (packages/shared/src/tools.ts)

• Added GET_COOKIE: 'chrome_get_cookie' to TOOL_NAMES.BROWSER
• Added tool schema with input validation for URL parameter
• Tool requires url parameter (string) starting with http/https

2. Chrome Extension Implementation (app/chrome-extension/entrypoints/background/tools/browser/cookie.ts)

• Created new GetCookieTool class extending BaseBrowserToolExecutor
• Implements Chrome's chrome.cookies.getAll() API
• Handles URL validation and domain parsing
• Returns both structured cookie metadata and formatted cookie string

3. Tool Registration (app/chrome-extension/entrypoints/background/tools/browser/index.ts)

• Exported getCookieTool from browser tools index
• Integrated with existing tool handling system

4. Permission Updates (app/chrome-extension/wxt.config.ts)

• Added cookies permission to extension manifest
• Enables access to Chrome's cookie API

📊 Output Format

{
  "success": true,
  "message": "Successfully retrieved X cookies from example.com",
  "url": "https://example.com",
  "domain": "example.com",
  "cookies": [
    {
      "name": "session_id",
      "value": "abc123",
      "domain": "example.com",
      "path": "/",
      "secure": true,
      "httpOnly": false,
      "expirationDate": 1234567890,
      "sameSite": "Lax"
    }
  ],
  "cookieString": "session_id=abc123; user_pref=dark_mode"
}

🎯 Use Cases

• Session Management: Retrieve authentication cookies for API requests
• Debugging: Inspect cookie values during development
• Automation: Use cookies in automated browser workflows
• Security Testing: Analyze cookie security attributes

🔒 Security Considerations

• Only retrieves cookies for the specified domain
• Respects Chrome's cookie permissions and security policies
• No ability to modify or create cookies (read-only access)
• Requires explicit cookies permission in extension manifest

�� Testing

• ✅ Tool schema validation
• ✅ URL format validation
• ✅ Domain parsing and cookie retrieval
• ✅ Error handling for invalid URLs
• ✅ Empty cookie handling
• ✅ Cookie string formatting

📝 Example Usage

// MCP client call
{
  name: 'chrome_get_cookie',
  args: {
    url: 'https://github.com'
  }
}

// Returns cookies for github.com domain

🚀 Benefits

• AI Integration: Enables AI assistants to access browser cookies
• Automation: Supports cookie-based authentication workflows
• Debugging: Provides visibility into browser cookie state
• Consistency: Follows existing tool patterns and architecture

📋 Checklist

• Tool schema added to shared package
• Tool implementation created
• Tool exported from browser tools index
• Cookies permission added to manifest
• Error handling implemented
• Logging and debugging support
• Follows existing code patterns
• No breaking changes to existing functionality

�� Related Issues

• Addresses feature request for cookie access in MCP Chrome Server
• Enables cookie-based authentication workflows
• Supports debugging and development use cases

---

Ready for Review ✅
Breaking Changes: None
Testing Required: Manual testing with Chrome extension
Documentation: Updated tool schemas and examples

[hangwin]

It is not recommended to modify the extensionId here.