To be precise I'd call it a "dynamic API client". The codebase doesn't change, you read the schema and corresponding actions become available on the client.

There are also "autogenerated API clients", where the API code is templated, based on the API schema.

(I think the swagger-js client also falls into the "dynamic" category, tho most other language implementations based on swagger fall into the templated "autogenerated" category.)

And, yup, working towards bring Core API up to feature parity with Swagger, so that you can fully interoperate with everything that the Swagger ecosystem already provides.