import { type DeliveryMessage } from "../../contracts/index.js";
export interface MessageSelectRequest {
    installId?: string;
    clientVersion: string;
    clientKind: "cli" | "mcp";
    /** Enum signal — never a transcript or raw content */
    trigger?: "first_verified_run" | "milestone_reached" | "version_check";
}
export interface MessageClientOptions {
    endpoint?: string;
    timeoutMs?: number;
}
/**
 * Fetch a server-selected message from the Control Plane.
 * Returns null on any network failure, timeout, or validation error.
 * Never throws — the primary command must never be affected.
 */
export declare function fetchSelectedMessage(request: MessageSelectRequest, options?: MessageClientOptions): Promise<DeliveryMessage | null>;