Agent Skills are the open standard ( agentskills.io ) for packaging team-specific instructions that any AI coding tool can discover. Migrating from hand-maintained Cursor rules means moving from static markdown you write once to structured, evidence-ranked intelligence your team already enforced in PR review — and (optionally) letting tooling generate the skill automatically. Why migrate? Cursor rules live only in Cursor's tree. Copilot wants .github/copilot-instructions.md ...