A Cloudflare-hosted scanner at isitagentready.com demonstrates that most websites lack the emerging protocols required for autonomous AI agents to discover, access, authenticate and transact. The tool audits five categories — discoverability via robots.txt, sitemaps and Link headers; content accessibility through Markdown content negotiation; bot access controls with AI-specific robots.txt rules; capability discovery including MCP Server Card, Agent Skills, WebMCP, API Catalog, OAuth discovery and protected-resource metadata; and commerce readiness via x402, UCP and ACP headers — citing primary checks run against live sites (https://isitagentready.com). A 2023 WebArena benchmark paper documented brittle agent performance on unmodified web UIs, while Anthropic's 2024 analysis of production agent workflows noted that tool-calling reliability collapses without standardized discovery and auth surfaces (https://arxiv.org/abs/2307.13854; https://www.anthropic.com/news/building-effective-agents). Coverage of the scanner itself stops at implementation tips and liability disclaimers, missing the deeper historical pattern: each prior platform shift (search crawlers 1994-2000, REST APIs 2005-2015, mobile responsive design 2010-2015) required infrastructure standards before applications scaled; agent readiness is repeating the cycle yet receives less attention than model releases. Without these primitives, autonomous agents cannot reliably locate capabilities, negotiate access, or complete x402-style microtransactions, creating a practical ceiling unrelated to LLM reasoning limits.