Agent Readiness Inspector

Audit sites for AI-agent readiness: robots.txt, llms.txt, Markdown negotiation, MCP, Content Signals. Local, no analytics.

Available on: Chrome Web Store Firefox Add-ons Edge Add-ons GitHub

Agent Readiness Inspector shows what AI agents can actually discover, read, and use on the site in front of you. It runs 22 standards-based checks directly in the browser and puts the score, the evidence, and copy-ready fix prompts beside the current tab.

Chrome and Edge use a native side panel. Firefox provides the same interface as a popup and a sidebar.

What it checks

  • robots.txt, sitemaps, and AI crawler rules
  • llms.txt and Markdown content negotiation
  • Content Signals and Web Bot Auth
  • Link headers, Agent Skills, and API Catalogs
  • MCP Server Cards, OAuth discovery, and WebMCP
  • Emerging agentic commerce protocols

What you get

  • A comparable score and a readiness level
  • Raw evidence for every verdict
  • Prioritized, copy-ready fix prompts
  • Saved sites, batch rescans, and score history
  • Scheduled monitoring with a local alert inbox
  • Optional notifications when a check regresses
  • An optional score badge and auto-scan mode, both controlled in settings

Because the audit runs inside the browser, it can inspect staging sites and many authenticated pages that an external scanner cannot reach. Browser cookie protections may still limit session access on some sites.

Repair kits

A failed check comes with the fix: what the standard requires, the change for the stack the site appears to run on (Cloudflare, Vercel, Netlify, nginx, Next.js), and the one command that proves it landed.

Privacy

The extension handles site URLs and response content only to produce the audit. Results, saved sites, history, settings, and alerts stay in local browser storage. 301.st receives no scan or browsing data. There is no analytics, telemetry, advertising, or remote code. One check reads DNS: it asks a public DNS-over-HTTPS resolver whether the audited hostname publishes agent-discovery records.

Why site access is required

The extension can audit any site you choose, so it needs host access to fetch that site's headers, robots.txt, sitemap, and well-known resources. It does not inject content into the pages you visit.

Open source

Source code: github.com/investblog/agent-readiness-inspector. Apache 2.0 license. Agent Readiness Inspector is an independent implementation of open web standards. It is not affiliated with or endorsed by Cloudflare.