MCP - download attachments

It appears that the MCP server is not able to download attachments. Endpoints return attachment links as .../rails/active_storage/blobs/... links that can be downloaded successfully by other methods (e.g. curl) as long as the X-API-KEY header is included and redirects are followed. However, MCP clients are typically unaware of the key itself as it is part of the server configuration. Is there any workaround suggested?