import type { AgentMessage } from '@earendil-works/pi-agent-core';
export interface CompactionUnit {
    messages: AgentMessage[];
    text: string;
    estimatedTokens: number;
}
export interface CompactionChunk {
    text: string;
    estimatedTokens: number;
    messageCount: number;
    oversized: boolean;
}
export declare function serializeMessageForCompaction(message: AgentMessage): string;
export declare function buildCompactionUnits(messages: readonly AgentMessage[]): CompactionUnit[];
export declare function planCompactionChunks(messages: readonly AgentMessage[], maxChunkTokens: number): CompactionChunk[];
export declare function extractExactIdentifiers(messages: readonly AgentMessage[], limit?: number): string[];