Creator & Maintainer
AI Visibility Definition
Mark authored the AI Visibility Definition: the degree to which a website can be discovered, interpreted, and cited by AI systems. The accompanying AI Discovery File Specifications outline 10 machine-readable files (including llms.txt, ai.json, identity.json, and brand.txt) organised into three implementation tiers.
The Q2 2026 Adoption Study crawled 1,905 domains across the top 1,000 global and top 1,000 UK websites. Only 7.2% had any AI Discovery File (up from 6.5% in Q1), while 85% had no AI-specific policy in their robots.txt. The llms.txt file saw the strongest growth, nearly doubling from 35 to 61 valid implementations. All datasets are published as open data under CC BY 4.0.
For WordPress users, Mark built the AI Discovery Files plugin. It generates all 10 files from the WordPress admin with auto-detection, live preview, and validation. No code required.