import type { Provider, Message } from '../providers/index.js';
export interface ContextStats {
    totalTokens: number;
    messageCount: number;
    compactedCount: number;
    estimatedPct: number;
}
export interface ContextBudgetOptions {
    contextLimit?: number;
    inputLimit?: number;
    outputReservation?: number;
    scalableBuffer?: number;
}
export interface ContextBudgetDiagnostics {
    contextLimit: number;
    inputLimit?: number;
    outputReservation: number;
    scalableBuffer: number;
    reservedTokens: number;
    effectiveInputLimit: number;
    autoCompactThreshold: number;
}
export declare class ContextManager {
    private provider;
    private model;
    private compactCount;
    private contextLimit;
    private inputLimit?;
    private outputReservation;
    private configuredScalableBuffer?;
    constructor(provider: Provider, model: string, contextLimitOrOptions?: number | ContextBudgetOptions, options?: ContextBudgetOptions);
    private validPositive;
    setContextLimit(limit: number): void;
    updateBudget(options: ContextBudgetOptions): void;
    getContextLimit(): number;
    getBudgetDiagnostics(): ContextBudgetDiagnostics;
    estimateTokens(messages: Message[]): number;
    getStats(messages: Message[]): ContextStats;
    shouldCompact(messages: Message[]): boolean;
    private safeKeepFrom;
    private tailKeepFromByBudget;
    compact(messages: Message[]): Promise<Message[]>;
    pruneToolResults(messages: Message[]): Message[];
    trimOldMessages(messages: Message[], maxTokens?: number): Message[];
    optimize(messages: Message[]): Message[];
    private summarize;
}
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