Copilot Customization Files
GitHub Copilot supports several file-based customization mechanisms beyond the global .github/copilot-instructions.md. This page covers advanced file types — .instructions.md, .prompt.md, SKILL.md, and *.chatmode.md — plus Copilot Extensions that give teams scoped, reusable, and agent-discoverable customization. For the basics of .github/copilot-instructions.md, .cursorrules, and CLAUDE.md, see Prompt Engineering → Workspace Instruction Files.