OpenAPI Overlays Tooling Support Across Open-Source and Commercial Services

The OpenAPI Overlay Specification reached a stable 1.0.0 release , and the tooling has been steadily catching up ever since. Overlays give you a clean, repeatable way to apply a list of actions to an OpenAPI document — strip internal endpoints before publishing, inject examples, tweak a spec before SDK generation, or speak to multiple audiences from a single source of truth — all without forking or hand-editing the underlying description. I keep getting asked which tools actually support overlays today, so I wanted to round up the open-source libraries and CLIs alongside the commercial service