/**
 * Time Formatter - Human-Readable Time Formatting
 *
 * Converts Unix timestamps to human-readable relative time format
 * Examples: "2d ago", "3h ago", "just now"
 *
 * Used by list_decisions and recall_decision tools
 *
 * @module time-formatter
 */
/**
 * Format Unix timestamp (milliseconds) to human-readable relative time
 *
 * AC #2: Format created_at as human-readable ("2d ago", "3h ago", etc.)
 *
 * @param timestamp - Unix timestamp in milliseconds OR ISO 8601 string
 * @returns Human-readable time string
 *
 * @example
 * formatTimeAgo(Date.now() - 3600000) // "1h ago"
 * formatTimeAgo(Date.now() - 172800000) // "2d ago"
 * formatTimeAgo("2025-11-20T10:30:00Z") // "2d ago" (if today is 2025-11-22)
 */
export declare function formatTimeAgo(timestamp: number | string | null | undefined): string;
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