After a brief period for final comments (thanks everyone for your input!), the
Stable Interface Policy is now official. You can read it here:
This policy is intended to give authors of software that accesses Wikidata a
guide to what interfaces and formats they can rely on, and which things can
change without warning.
The policy is a statement of intent given by us, the Wikidata development team,
regarding the software running on the site. It does not apply to any content
maintained by the Wikidata community.
Senior Software Developer
Gesellschaft zur Förderung Freien Wissens e.V.