/** This is a budget for the single progress body, not for the enclosing Status JSON. */
export declare const DEFAULT_PUBLIC_PROGRESS_CODE_POINTS = 800;
export interface BackendProgressItem {
    id: string;
    type: string;
    text?: string;
    phase?: string | null;
    delivery?: string | null;
    status?: unknown;
    exitCode?: unknown;
    /** Native item times only: never synthesize these from the read or turn time. */
    startedAtMs?: number | null;
    completedAtMs?: number | null;
}
export interface BackendProgressTurn {
    id?: string;
    turnId?: string;
    itemsComplete: boolean;
    items: BackendProgressItem[];
}
export type BackendProgressReadError = "read_failed" | "missing_exact_turn" | "incomplete_items" | "identity_mismatch";
export interface BackendPublicProgress {
    state: "available" | "no_public_progress" | "read_error";
    text: string;
    native_turn_id: string | null;
    read_at: string;
    latest_item_at: string | null;
    truncated: boolean;
    reason?: BackendProgressReadError;
}
/** Status-only projection. Callers must also verify the snapshot's exact thread identity. */
export declare function backendPublicProgress(options: {
    nativeTurnId: string | null;
    turn?: BackendProgressTurn;
    readAt: string;
}): BackendPublicProgress;
export declare function backendPublicProgressReadError(nativeTurnId: string | null, readAt: string, reason?: BackendProgressReadError): BackendPublicProgress;
export declare function validNativeItemTime(value: unknown): value is number;