Souradip Poddar, Chia-Tung Ho and coauthors present HeaRT, an agentic AMS design framework that organizes circuit hierarchy, functional roles and feedback relationships to guide design changes. The work includes topology exploration as well as parameter refinement. The authors list NVIDIA, UT Austin and George Washington University affiliations. This records a research publication, not NVIDIA production deployment. The Event retains the November 24, 2025 initial-publication date; the March 26, 2026 revision is supporting evidence for the same research milestone.