/**
 * @fileoverview Markdown rendering for the `budget` enrichment field — shared by the
 * `enrichmentTrailer` of every tool that calls the OpenAlex API. Collapses the three
 * numeric fields to one trailer line; `structuredContent` keeps the numbers.
 * @module mcp-server/tools/render-budget
 */
import type { UpstreamBudget } from '../../services/openalex/budget.js';
/**
 * One-line budget trailer. `costUsd: 0` renders as "free" rather than `$0.0000` because it
 * carries real signal — it means the call was a singleton ID lookup, which OpenAlex does not
 * bill, so batching by ID beats paging a filtered list. The prepaid segment appears only for
 * an account holding that balance: without it, "left today" is the whole spendable figure;
 * with it, the daily line alone reads as broke on an account that keeps serving.
 */
export declare function renderBudgetTrailer(budget: UpstreamBudget | undefined): string;
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