Is every API call separate?

[leei]

I don't see anything suggesting that a sequence of API calls are linked together as a conversation.

So I guess the question is:

1. Is each API call an isolated request?
2. Is there a way I can have the same backend app manage multiple conversations that each retain their own separate context?

[leei]

If this uses the Gemini model of just requiring you to augment the "messages" container by including the previous response, then that should be documented.