What Open-Source Projects Tell Their Coding Agents: A Census of AGENTS.md and CLAUDE.md
Coding agents can be guided with instruction files in a repository. We examine this emerging practice through a census of 22,854 popular, active GitHub repositories in thirteen languages, treating each repository's root'AGENTS$.$md'and'CLAUDE$.$md'as one instruction set. Agent instructions appear in 26.3% of repositori...