About Claude Guard

Claude Guard is a browser environment self-check service for Claude risk-control research. It collects 72 observable signals across network identity, locale consistency, automation markers, and fingerprint entropy, then returns a red, warning, white, or neutral verdict.

The project is intentionally simple: pure Node.js built-in http, built-in node:sqlite, vanilla HTML, CSS, and JavaScript, with no third-party npm dependencies.

What It Is For

Use it to understand whether your browser timezone, language, fonts, IP location, request headers, WebRTC behavior, and device fingerprint signals are internally consistent for Claude access. It is a self-check and research tool, not an official Anthropic decision system.