Reviews a REST or GraphQL interface change for backward compatibility and design problems before it ships. Detects removed or renamed fields, narrowed types, changed nullability, removed enum values, altered error shapes, and pagination that breaks under concurrent writes, then gives a compatible migration path. Use when adding or changing an endpoint, editing an OpenAPI or GraphQL schema, or deciding whether a change needs a version bump. Do not use for internal function signatures, database schema review, or client-side code.
