I've got a series of paths that use the same path parameter:
catalogItemId: # <-- Not a valid parameter definition
description: The ID of the catalog item to update.
Shortly after posting this I realized that the path parameter was listed as
Path parameters MUST be required for Swagger API definitions. Changing that to
true fixed everything up. It's just a side effect of the way the schema validation occurs that causes a non descriptive error to get dumped out.