/**
 * Compact, human-readable fleet / delegate lines for TUI chat history.
 *
 * Goals:
 * - One short scan line (no raw `Budget exceeded: timeout (limit=…)` dumps)
 * - Duration that reads as 12s / 2m 51s rather than 171s
 * - Delegate start shows a tight task preview, not a paragraph
 */
/** Format a duration for a history chip. */
export declare function formatHistoryDuration(ms: number): string;
/** Collapse whitespace and hard-cap a task/description for a single history line. */
export declare function shortenTaskPreview(task: string, maxChars?: number): string;
export interface SubagentCompletionLike {
    status: string;
    iterations: number;
    toolCalls: number;
    durationMs: number;
    error?: {
        kind?: string | undefined;
        message?: string | undefined;
    } | undefined;
}
/**
 * One-line outcome for `subagent.task_completed` (and similar).
 *
 * Known budget/timeout kinds drop the raw engine message — the kind + stats
 * are enough. Unknown failures keep a short message tail when useful.
 */
export declare function formatSubagentCompletionText(e: SubagentCompletionLike): string;
/**
 * Compact `delegate.started` body. Label already carries the role; this is
 * just the task preview (or a bare "started" when the task is empty).
 */
export declare function formatDelegateStartedText(task: string): string;
/**
 * Compact `delegate.completed` body for success. Failures are left to
 * `subagent.task_completed` so history doesn't print the same death twice.
 */
export declare function formatDelegateSuccessText(input: {
    summary?: string | undefined;
    iterations: number;
    toolCalls: number;
    durationMs: number;
}): string;
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