export declare const SYSTEM_PROMPT_CACHE_SPLIT = "\u200B";
export declare function splitSystemPromptForCache(systemPrompt: string): {
    stable: string;
    volatile: string;
};
export type PromptCacheControl = {
    type: "ephemeral";
    ttl?: "1h";
};
export declare function stablePrefixCacheControl(): PromptCacheControl;