/** A tool-call part rendered by <Tool>. Pure type — kept JSX-free so it can be
 *  imported by the framework-neutral state core and the React typecheck pass. */
export interface ToolPart {
    type: string;
    state: 'input-streaming' | 'input-available' | 'output-available' | 'output-error';
    input?: Record<string, unknown>;
    output?: Record<string, unknown>;
    toolCallId?: string;
    errorText?: string;
}