Context
GoogleChrome Lighthouse v13.5.0 adds an Agent Resource Discovery schema audit to its agentic-browsing tooling.
What changed
Lighthouse added ARD schema conformance auditing and grouped ARD with llms.txt under agent discovery. The release says it is expected to ship in Chrome 156 DevTools and PageSpeed Insights within two weeks.
Why it matters
Agent-oriented resource discovery is becoming a testable web property in mainstream Google web-auditing infrastructure, creating a concrete measurement surface for agent discoverability implementations.
Visibility OS interpretation
Visibility OS treats this as tooling and conformance evidence, not evidence that ARD, ai-catalog, or llms.txt improves Google Search, AI Overviews, AI Mode, Gemini retrieval, citation, or ranking.
What remains uncertain
How widely will Agent Resource Discovery be adopted? Will PageSpeed Insights rollout match the stated schedule? Will major agents consume ai-catalog resources in production?