Variable: MastraHistoryUIMessageSchema

const MastraHistoryUIMessageSchema: ZodObject<{ id: ZodString; metadata: ZodOptional<ZodUnknown>; parts: ZodReadonly<ZodArray<ZodUnknown>>; role: ZodEnum<{ assistant: "assistant"; system: "system"; user: "user"; }>; }, $strip>

Structural shape for an AI SDK V5 UIMessage. Defined locally so the shared types package stays dependency-free (no ai import). The runtime values returned by the /route/history endpoint are produced by toAISdkV5Messages and are 1:1 compatible with UIMessage from the ai package; clients can safely cast when needed.