export declare function extractFollowupSessionHeaders(headers: unknown): Record<string, string> | undefined;
export declare function buildServerToolNestedRequestMetadata(args: {
    baseMetadata?: Record<string, unknown>;
    extraMetadata?: Record<string, unknown>;
    entryEndpoint: string;
    onMergeRuntimeMetaError?: (error: unknown) => void;
}): Record<string, unknown>;