Hello all,
repeated discussions about what constitutes a breaking change has prompted us, the Wikidata development team, to draft a policy on interface stability. The policy is intended to clearly define what kind of change will be announced when and where.
A draft of the policy can be found at
https://www.wikidata.org/wiki/Wikidata:Stable_Interface_Policy
Please comment on the talk page.
Note that this policy is not about the content of the Wikidata site, it's a commitment by the development team regarding the behavior of the software running on wikidata.org. It is intended as a reference for bot authors, data consumers, and other users of our APIs.
We plan to announce this as the development team's official policy on Monday, August 22.