/**
 * Leaper Agent – Prompt Caching
 * Anthropic prompt cache control (system_and_3 strategy).
 */
export interface CacheControl {
    type: 'ephemeral';
    ttl?: '5m' | '1h';
}
export interface MessageWithCache {
    role: string;
    content: unknown;
    cache_control?: CacheControl;
}
export type MessageContent = string | Array<{
    type: string;
    text?: string;
    cache_control?: CacheControl;
    [key: string]: unknown;
}>;
export declare function applyCacheMarker(message: MessageWithCache, ttl?: '5m' | '1h'): MessageWithCache;
export declare function applyAnthropicCacheControl(messages: MessageWithCache[], systemPrompt?: string): {
    messages: MessageWithCache[];
    system?: MessageWithCache[];
};
export declare function isCachingAvailable(): boolean;
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