/** How a turn renders itself into the transcript and the channel. */
export declare function shouldPersistFinalAssistantMessage(options: {
    resultText: string;
    quietPreempted: boolean;
}): boolean;
export declare function formatEngineErrorAssistantMessage(error: string): string;
/**
 * What a settled turn shows. An engine that answered wins; otherwise its error
 * is surfaced; a turn with neither shows nothing, rather than a placeholder
 * that reads like an answer.
 */
export declare function turnDisplayText(result: string | undefined, error?: string | null): string;
/** When a usage limit is expected to lift, in the operator's local phrasing. */
export declare function formatResumeTime(resumeAt: Date | null | undefined): string | null;
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