import { Message } from './session.js';
export interface ISummarizer {
    summarize(messages: readonly Message[]): Promise<string>;
}
export interface TruncatingSummarizerOptions {
    /** Approximate maximum characters of summary output. Default: 2000. */
    maxChars?: number;
}
export declare class TruncatingSummarizer implements ISummarizer {
    private readonly maxChars;
    constructor(options?: TruncatingSummarizerOptions);
    summarize(messages: readonly Message[]): Promise<string>;
}
export interface AnthropicSummarizerOptions {
    apiKey?: string;
    model?: string;
    endpoint?: string;
    timeoutMs?: number;
}
export declare class AnthropicSummarizer implements ISummarizer {
    private readonly apiKey;
    private readonly model;
    private readonly endpoint;
    private readonly timeoutMs;
    constructor(options?: AnthropicSummarizerOptions);
    summarize(messages: readonly Message[]): Promise<string>;
}
export interface GoogleAISummarizerOptions {
    apiKey?: string;
    model?: string;
    endpoint?: string;
    timeoutMs?: number;
}
export declare class GoogleAISummarizer implements ISummarizer {
    private readonly apiKey;
    private readonly model;
    private readonly endpoint;
    private readonly timeoutMs;
    constructor(options?: GoogleAISummarizerOptions);
    summarize(messages: readonly Message[]): Promise<string>;
}
/**
 * Pick an ISummarizer based on available credentials:
 *   1. OrcaRouter credential + a selected model → OrcaRouterSummarizer
 *   2. ANTHROPIC_API_KEY → AnthropicSummarizer
 *   3. GOOGLE_AI_API_KEY → GoogleAISummarizer
 *   4. fallback        → TruncatingSummarizer (no network, no key)
 *
 * Anthropic sits second because this project is Claude-adjacent; users
 * who prefer Gemini can either unset ANTHROPIC_API_KEY or construct
 * GoogleAISummarizer directly.
 *
 * ORCAROUTER IS OPT-IN, not a fallback. It is selected only when the user has
 * both connected an OrcaRouter credential AND chosen a model for optimizer
 * calls, so a machine that merely happens to have a key in its environment
 * does not silently start routing summaries through a gateway nobody selected.
 * The credential itself is resolved by the shared seam, so a pasted key and a
 * PKCE-issued one behave identically here.
 */
export declare function createSummarizerFromEnv(): ISummarizer;
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