Voidwalker

Voidwalker lets AI agents (Claude, Cursor, Gemini) read and debug your browser's live state - localStorage, sessionStorage,IndexedDB, cookies, and DOM mutations - directly from your AI client.

It works by pairing a browser extension with a local MCP server running on your machine. All data stays on localhost; nothing is sent to any cloud service.

HOW IT WORKS:
1. Install this extension
2. Run the Voidwalker MCP server locally (npm install -g voidwalker-mcp)
3. Connect it to your AI client (Claude Desktop, Cursor, etc.)
4. Ask your AI to inspect your browser state, debug storage issues, or trace mutations

WHAT YOUR AI CAN DO:
• Read localStorage, sessionStorage, IndexedDB, and cookies from any tab
• Watch real-time DOM mutations as they happen
• Diff storage state before and after user actions
• Navigate tabs and execute storage reads/writes on your behalf

SECURITY:
• Token-authenticated WebSocket (256-bit token stored at ~/.voidwalker/token)
• All traffic is local (ws://127.0.0.1:3695)
• Sensitive keys (auth tokens, passwords, JWTs) are automatically redacted
• Rate limiting and connection eviction built in

PERMISSIONS EXPLAINED:
• <all_urls>: Required to inject at document_start before page scripts load, so Storage and IndexedDB APIs can be intercepted.Without this, reads would miss keys set during page initialization.
• storage, tabs, cookies, alarms: Used to read browser state and relay it to the local MCP server.

No data leaves your machine. Open source on GitHub.