I built OasRails, a Rails engine that automatically generates OpenAPI 3.1 documentation from YARD comments in your Rails controllers. It renders the docs using RapiDoc for a slick, interactive UI—no DSLs, no generators, and no dependency on RSpec or Grape.I was inspired by FastAPI’s interactive docs and wanted something similar for Rails. After not finding anything that met my needs, I built OasRails during downtime as a freelancing dev.