Next.js's AGENTS.md bans "Generated with Claude Code" commit footers (I read 100 of these files)

While analysing the AGENTS.md files of GitHub's 100 most-starred repos, we found this in vercel/next.js: Do NOT add "Generated with Claude Code" or co-author footers to commits or PRs It's part of a pattern: 784 explicit don't-rules across the corpus. - Bun forbids running bun test directly - hugo says "don't write a novel" - neovim's entire file is one AI-disclosure rule. The files read like scar tissue ie, every rule is a mistake an agent already made once. Full analysis, including a copy-paste template distilled from all 100: coldtea.ai/blog/agents-md-field-study