Its easy to get an unfriendly error via normal Playground UI

API
1

Go to Playground
Select Edit endpoint
Change Engine from

text-davinci-edit-001
to
code-davinci-edit-001

(the configuration is valid)

Now select Insert endpoint
Engine is still code-davinci-edit-001 which doesn’t support Insert
Sending some prompt results in an error

Invalid URL (POST /v1/engines/code-davinci-edit-001/completions)

Its not TOO hard to figure out, but I think the message could be more clear like “That engine can’t be used with this endpoint”. Or maybe a notification that you’ve switched to an unsupported endpoint.