Takafumi Mizuguchi

At 2 AM a parent's child has a fever. Three options: call a professional, drive to an open pharmacy, or wait until morning. The right one needs medical judgment the parent doesn't have. Japan's pediatric advice line takes 1.24M such calls a year — and its own ministry flags eleven structural gaps. Yorukusu is a SwiftUI iOS app that loads a pharmacist-authored Agent Skill (red-flag screening, OTC-only logic, parent-facing safety rationale), reconciles against a device-local Personal Health Context, and asks Claude Opus 4.7 to return one of three answers: CALL the right emergency number, GO to a pharmacy with a pharmacist on duty, or WAIT with explicit warning signs. Yorukusu does not diagnose — pharmacist-informed, not pharmacist-replacing.