interface EventBus {
    on(event: string, handler: (data: unknown) => void): () => void;
    emit(event: string, data: unknown): void;
}
export interface CavemanApplyResult {
    systemPrompt: string;
    tag: "caveman:on" | "caveman:off" | "caveman:unavailable";
    applied: boolean;
    warning?: string;
}
export declare function applyCavemanRpc(events: EventBus | undefined, systemPrompt: string, enabled: boolean, timeoutMs?: number): Promise<CavemanApplyResult>;
export {};