/**
 * `/insights` — agent activity summary over a configurable window.
 *
 * Source of truth: `~/.codeep/history/<id>.json`, one file per agent
 * run, written by the agent loop. Schema (relevant fields):
 *   { id, startTime, endTime, prompt, projectRoot, actions: [
 *       { type: 'write' | 'read' | 'execute' | …, path?, command?, timestamp }
 *     ]
 *   }
 *
 * We deliberately don't read sessions/*.json here — sessions store
 * chat history without tool-level detail, while history/ captures the
 * exact actions which is what users want to see ("which file did I
 * touch most this week?").
 *
 * Cost / token usage is per-process and lost across restarts (the
 * token tracker is in-memory), so /insights reports actions and time
 * but not historical dollar amounts. The current session's cost still
 * shows in /cost.
 */
interface InsightsOptions {
    /** Days to look back. Default 7. */
    days?: number;
}
/**
 * Format `/insights` output as Markdown. Returns a friendly empty-state
 * message when there's no history in the window — we don't error.
 */
export declare function formatInsights(opts?: InsightsOptions): string;
export {};