/** @experimental Identity of the provider attempt that produced the current stream part. */
export interface Identity {
    readonly modelCallId: string;
    readonly modelAttemptId: string;
    readonly attempt: number;
}
/** @experimental Mutable cell tracking the active attempt identity within one run. */
export interface IdentityCell {
    current: Identity | undefined;
}
/** @experimental */
export declare const makeIdentityCell: () => IdentityCell;