[smartvlad]

If you look at the actual raw output of tools/list call you may find it surprisingly similar to the OpenAPI spec for the same interface. In fact they are trivially convertible to each other.

Personally I find OpenAPI spec being more practical since it includes not just endpoints with params, but also outputs and authentication.

Know all that from my own experience plugging dozens of APIs to both MCP/Claude and ChatGPT.