import type { EnvelopeBus } from '@zhixuan92/multi-model-agent-core/events/envelope-bus';
/**
 * Map one provider event to a headline, or null when the event says nothing a person would
 * want on screen. Returning null is the common case and must stay cheap: this runs on every
 * event of every concurrent task.
 */
export declare function headlineForEvent(fields: Record<string, string | number | boolean | null>): string | null;
interface HeadlineSink {
    setHeadline(taskId: string, headline: string): void;
    /** Called for EVERY provider event, not only the ones that make a readable headline —
     *  a `grep` that produces no printable line is still the worker doing something. */
    recordActivity(taskId: string): void;
}
/**
 * Subscribe to the bus and keep each running task's headline current.
 *
 * Returns the unsubscribe function. Failures are swallowed per-event on purpose: a headline is
 * decoration, and an exception raised here would propagate into the bus's subscriber loop and
 * disrupt logging and telemetry for a cosmetic feature.
 */
export declare function attachHeadlineProducer(bus: EnvelopeBus, sink: HeadlineSink): () => void;
export {};
//# sourceMappingURL=headline-from-events.d.ts.map