/**
 * Render engine messages to a compact plain-text transcript for the compactor
 * window, and account their tokens. Reuses the existing context-xray token
 * accounting so OM thresholds match what the rest of the framework counts.
 */
import type { EngineMessage } from "../engine/types.js";
/** Flatten one engine message to a single labeled line block. */
export declare function messageToText(message: EngineMessage): string;
/** Render a contiguous window of messages to one text blob. */
export declare function windowToText(messages: EngineMessage[]): string;
/** Token count for a window of messages (reuses framework tokenizer). */
export declare function countWindowTokens(messages: EngineMessage[]): Promise<number>;
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