/**
 * Provider abstraction — one interface, many backends.
 *
 * All backends speak the same simple "send a system prompt + user message,
 * get text back" protocol. We don't need streaming or tool use for translate/
 * expand/rerank.
 */
import type { LlmCreds } from './config.js';
export interface ProviderRequest {
    system: string;
    user: string;
    /** Hard cap on output tokens. */
    maxTokens: number;
    /** 0..1; lower = more deterministic. We default to 0.1. */
    temperature?: number;
}
export interface ProviderResponse {
    text: string;
    /** Total input + output tokens, when reported by the backend. */
    tokens: {
        input: number;
        output: number;
    } | null;
}
export interface Provider {
    readonly creds: LlmCreds;
    call(req: ProviderRequest): Promise<ProviderResponse>;
}
export declare function createProvider(creds: LlmCreds): Provider;
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