Exnos

Live browser-state verification for AI coding agents. Your AI says "done." Exnos is how it knows. One tool call returns the full state of the Chrome tab you are looking at: every field, every button, every console error, network requests, storage, performance, in milliseconds. Read-only. Local. Free, MIT.

Experimental. Exnos reads a live Chrome tab through a local bridge. Expect it to break when a site ships a change. MIT licensed, as-is, no warranty.

Install (2 minutes)

1. Connect your agent

claude mcp add-json --scope user exnos '{"command":"npx","args":["@golproductions/exnos"]}'

Any MCP client (.mcp.json):

{ "mcpServers": { "exnos": { "command": "npx", "args": ["@golproductions/exnos"] } } }

2. Load the extension

npx @golproductions/exnos path

Open chrome://extensions, enable Developer mode, click Load unpacked, pick that folder. Badge reads ON when connected.

Related MCP server: webclaw-mcp

What it sees

A single exnos_verify call returns:

• URL, title, ready state -- navigation facts, not assumptions

• Every visible field with its live value

• Every button with its disabled state

• Checkboxes and radios with checked state

• Visible alerts and UI warnings

• Console errors and uncaught exceptions captured from page load

• Network requests -- every fetch and XHR: URL, method, status, response body, timing. Failures surfaced first.

• WebSocket frames -- sent and received, last 30

• localStorage, sessionStorage, cookies -- live storage state

• Performance -- page load, TTFB, DOM ready, paint timing, long tasks, JS heap

• Focus -- which element has focus right now

• Shadow DOM -- pierces component library boundaries

• Same-origin iframes -- text and errors inside frames

• App globals -- any window.__* values the app sets

Tools

CLI

npx @golproductions/exnos path     # print extension folder path
npx @golproductions/exnos init     # write Exnos rule into agent rules files
npx @golproductions/exnos rules    # print the rule text

Notes

• Server on 127.0.0.1:17872 (override: EXNOS_PORT). GET / returns {"exnos":true,"extension":true|false}.

• Extension reconnects automatically after Chrome or server restart.

• Internal pages (chrome://) cannot be inspected.

• Console errors are captured from document_start. Pages open before the extension loaded need one reload.

• Network tap intercepts fetch and XHR at document_start. Requests made before the extension loaded are not captured.

License

MIT. The names "Exnos" and "GOL Productions" are trademarks of GOL Productions and are not licensed under MIT. Forks must use a different name.

Product · GOL Productions · GitHub