/**
 * Agent liveness computation.
 * Pure function that determines agent state from last_active timestamp.
 */
import type { AgentLiveness, LivenessThresholds } from "./types.js";
export declare const DEFAULT_LIVENESS_THRESHOLDS: LivenessThresholds;
/**
 * Compute agent liveness state based on elapsed time since last activity.
 * - "active" if elapsed < idle_after_ms
 * - "idle" if elapsed < gone_after_ms
 * - "gone" otherwise
 */
export declare function computeLiveness(lastActive: string, now?: Date, thresholds?: LivenessThresholds): AgentLiveness;
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