Gemini should be told a rule that never provide mock functions, placeholders and demo
most of the time i see this issue, when i asked it to add a function it add mock functions, just a demo project.
this is making useless projects it mean only that firebase studio can be only used for prototype.
In rules, which it should always follow this rule can be set as mode
if mode is prototype then it can go for placeholders and mock data but if its development or production then this is useless with mock or placeholder building the apps.

I always specially instruct gemini that do not use mock or placeholder but it always do same did not follow the prompt . So setting strict rule can help on this.