It's not clear what is the meaning of "directive" in the message "wikibase-api-not-recognized".
I guess that it's something like "function" or "command" in a programming language, but it's better to document it in qqq.
Version: unspecified
Severity: normal
Whiteboard: storypoints: 1
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=38675
The directive is a string that marks which kind of internal structure to access, you might say it is a command to store some value as a specific property.
Feel free to make more descriptive qqq-descriptions.
I would actually call it "field" or "key". This message is issued when the supplied json object contains a field that is not known. Known fields would be "labels", "descriptions" and so on. If the object also contains "foobar", you will get wikibase-api-not-recognized.