Its easy to get an unfriendly error via normal Playground UI

Go to Playground
Select Edit endpoint
Change Engine from


(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.