Different AI coding agents use different configuration files:

• .github/copilot-instructions.md for GitHub Copilot
• CLAUDE.md for Claude Code
• GEMINI.md for Gemini
• AGENTS.md for various other tools

You might switch tools later. The industry is converging on AGENTS.md, so use that as your source of truth and symlink the others to it.

ln -s AGENTS.md CLAUDE.md
ln -s AGENTS.md .github/copilot-instructions.md