import type { ContextMode, ContextBudgetPlan } from './ContextBudgetPolicy.js';
export type ContextSlot = 'system_policy' | 'user_request' | 'must_keep' | 'conversation_summary' | 'retrieval_evidence';
export interface ContextBlock {
    id: string;
    slot: ContextSlot;
    text: string;
    tokens: number;
    score?: number;
    timestamp?: string;
    duplicateKey?: string;
    required?: boolean;
    compressed?: boolean;
}
export interface PackContextInput {
    windowTokens: number;
    mode?: ContextMode;
    blocks: ContextBlock[];
    confidenceThreshold?: number;
}
export interface PackedContextResult {
    plan: ContextBudgetPlan;
    selected: ContextBlock[];
    dropped: ContextBlock[];
    usedInputTokens: number;
    slotUsage: Record<ContextSlot, number>;
    overflowHandled: boolean;
    recallConfidence: number;
    shouldAskClarification: boolean;
}
export declare function packContext(input: PackContextInput): PackedContextResult;