API to Get all tables / Get tables schema info?

Looking at Glide Tables API it mentions Get all tables and Get table schema info are available:

But I can’t figure out the API query for it. This returns a 401 unauthenticated request error:

https://api.glideapp.io/api/apps/yjibsbwgcogU5spoof/tables

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Is getting tables and schema info only available through the javascript client?