/**
 * Unified LLM API for ralph-starter
 * Supports Anthropic (via SDK with prompt caching), OpenAI, and OpenRouter
 */
import { type LLMProvider } from './providers.js';
export interface LLMRequest {
    prompt: string;
    /** Optional system message (will be cached for Anthropic) */
    system?: string;
    maxTokens?: number;
    model?: string;
}
export interface LLMUsage {
    inputTokens: number;
    outputTokens: number;
    cacheCreationInputTokens?: number;
    cacheReadInputTokens?: number;
}
export interface LLMResponse {
    content: string;
    model: string;
    provider: LLMProvider;
    usage?: LLMUsage;
}
/**
 * Unified LLM call function
 * Calls the appropriate provider API based on provider type
 */
export declare function callLLM(provider: LLMProvider, apiKey: string, request: LLMRequest): Promise<LLMResponse>;
/**
 * Try to call LLM with auto-detected or specified provider
 * Returns null if no API key is available
 */
export declare function tryCallLLM(request: LLMRequest, options?: {
    provider?: LLMProvider;
    apiKey?: string;
}): Promise<LLMResponse | null>;
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