import type { Message } from '../types/message/index.js';
/**
 * The one marker that says a message is a compaction summary.
 *
 * It lived in the iteration phase, which is a layer above this module, so
 * anything down here that needed it — a host-callable compaction, for one —
 * either could not reach it or would have had to import upward. Two copies
 * of the string is the other way that goes, and then a rename in one of
 * them makes every prior summary invisible to the check that drops it.
 */
export declare const COMPACTION_HEADER = "[COMPACTED CONTEXT] The following is a structured summary of the conversation so far.";
/**
 * Identity check for a prior compaction summary in the leading floor.
 *
 * Used to replace a summary produced by the SAME run in place, and by restore
 * paths to preserve summaries whose state was produced elsewhere. A retained
 * summary is deliberately not replaceable: it is the only surviving record
 * of an opaque older span.
 */
export declare function isCompactionMessage(content: string | null | undefined): boolean;
/** The summary, as the system message that replaces what it summarises. */
export declare function buildCompactionMessage(body: string): Message;
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