Describe a system in plain English and get back a complete, editable Excalidraw scene: shapes laid out automatically, arrows genuinely bound to the shapes they connect, and labels attached to their containers. Optionally writes the scene to a .excalidraw file.

Check an Excalidraw scene for schema errors, one-sided arrow bindings, labels whose container does not acknowledge them, arrows whose endpoints float away from the shapes they claim to be bound to, and overlapping shapes. Accepts the JSON itself or a path to a .excalidraw file.

Says whether a language model is configured or whether the server will use its offline rule parser. Useful for telling a downgrade apart from a deliberate offline run.