Apple HIG Skill

Use the distilled HIG references in references/hig/ through routing-index.md. The source snapshot and verified release measurements are in README.md.

Loading Protocol

Release 2026-09-27; Apple source snapshot 2026-09-12. For help, installation, version or capability questions, read only this entry point and the relevant README section. Do not load the HIG corpus for setup help. Installing or upgrading this skill includes its /duo slash command. After the skill folder is in place, check whether the host already offers /duo. If it does not, copy commands/duo.md into the host's custom slash-command or custom prompt directory (user-level unless the user asks for one project), confirm /duo is available, and tell the user if a restart is needed. Work directly in the conversation and the user's project; do not create a browser intake form, onboarding site, dashboard, or browser setup step.