VinF Hybrid Inference: disable multi-turn support #8973
Merged
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Problem statement
We can't differentiate roles until Chrome supports the LanguageModelMessage type.
Multi-turn requests differentiate turns by role, so without roles, we can't support multi-turn.
We can't throw to indicate a lack of support, like we can with countToken, because ChromeAdapter integrates below
ChatSession.
Bug: b/413402604
Proposal
This change indicates a lack of support for multi-turn requests by updating the request validator to fail if a request contains non-"user" roles. We can relax this once LanguageModelMessage is released.