ModelMessageBlock

type ModelMessageBlock = 
  | {
  index: number;
  type: "thinking";
}
  | {
  length: number;
  type: "text";
}
  | {
  id: string;
  type: "tool-call";
};

Defined in: packages/ai/src/types.ts:423

One block of an assistant ModelMessage, in the order the model sent it. Each entry points into a field of the message. See ModelMessage.blockOrder.