July 17, 2026

5.75.4

(fix): fern check now compiles each docs page’s MDX and reports syntax errors such as unclosed components (e.g. a <Card> without a closing tag). Previously the MDX-validation rule was defined but not registered, so malformed MDX passed validation and only broke at render/build time. Reported at warning severity to avoid breaking existing runs on repos with latent MDX issues.

5.75.3

(fix): Improve OpenAPI example generation performance for schemas with shared allOf ancestors while preserving inherited properties and constraints.

5.75.2

(fix): The OpenAPI importer now emits a warning when a discriminated union lists a member in its oneOf/anyOf that is absent from the discriminator mapping. Previously such members were silently dropped from the generated union, producing an SDK whose wire contract did not match the spec. The warning names the offending schema so the failure is loud instead of silent.

5.75.1

(fix): Fix fern docs theme upload failing with a 422 “Content has not been uploaded” error when binding theme assets. The content-existence check now uses the org-scoped registry content path so uploaded content is stored under the same org as the subsequent file bind.

(fix): Fix fern docs theme upload always targeting the production registry regardless of the CLI build environment. It now falls back to DEFAULT_FDR_ORIGIN (the origin configured for the CLI build, e.g. dev) like other CLI services, so a dev-CLI login token is no longer sent to the production registry (which returned 403 “Failed to resolve organizations”).