content: 
  | string
  | ContentPart<unknown, unknown, unknown, unknown, unknown>[];

content: 
  | string
  | ContentPart<unknown, unknown, unknown, unknown, unknown>[];

optional error: string;

optional error: string;

state: ToolResultState;

state: ToolResultState;

toolCallId: string;

toolCallId: string;

type: "tool-result";

type: "tool-result";