/**
 * /cost — session token and cost totals.
 *
 * Walks every assistant message in the current session and sums tokens + cost,
 * then prints a session total followed by a per-model breakdown.
 * Per-tool attribution is intentionally not shown — tokens aren't tracked
 * per-tool, and any heuristic would be misleading.
 */
import type { ExtensionAPI } from "../../core/extensions/types.js";
export declare function setupCost(hoo: ExtensionAPI): void;
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