Metadata changes have historically been a costly development activity within the Samvera community. Over the years, there have been evolving community efforts to tame this problem by providing mechanisms for metadata configuration. This presentation will cover Project Surfliner’s implementation of the Machine-readable Metadata Modeling (M3) Specification—now nearly feature‐complete, and including some necessary extensions—focusing on how it supports our metadata experts in managing different schemas for our adopter campuses and coordinating metadata mappings between applications in our growing digital library architecture. We’ll also cover how our work fits into the technical landscape of configurable metadata in other community projects.