API schema discovery

I know this has been answered before but for the life of me I can’t find it in the seach.

is the api discovery tool in server connect based on a publically available repository or is it custom built?

Sorry to ask this

Can you please explain which component are you referring to?

sorry in the code when putting in the api then returning the schema that action of returning the schema is that based on a opensource library or did you folks write it?