/**
 * @fileoverview Shared content[] rendering helpers for tool `format()` functions,
 *   enforcing content/structuredContent parity: exact numeric rendering (never lossy
 *   `toFixed`/`Math.round`) and explicit null/empty state so a client reading only
 *   `content[]` sees every value a `structuredContent` client sees — including the
 *   difference between an absent field and a zero/empty one.
 * @module mcp-server/tools/format-helpers
 */
/**
 * Placeholder rendered for a null, undefined, or empty value. Matches the
 * codebase's existing `join(', ') || 'none'` convention (e.g. get-block's
 * `activeServiceIds`).
 */
export declare const EMPTY = "none";
/**
 * Render a nullable scalar, or {@link EMPTY} when it is null, undefined, or an
 * empty string. Numeric `0` is a real value and renders as `"0"` — only null,
 * undefined, and `""` collapse to `none`. Pass `render` to wrap a present value
 * (e.g. a `#` colour prefix or a `°` unit suffix) so the affix never attaches to
 * the placeholder.
 */
export declare function orNone(value: string | number | null | undefined, render?: (value: string | number) => string): string;
/** Render a lat/lon pair at exact precision — never rounded through `toFixed`. */
export declare function coords(lat: number, lon: number): string;
/**
 * Render a position at exact precision, or {@link EMPTY} when it is null/undefined —
 * so an absent position is explicit rather than a missing line.
 */
export declare function coordsOrNone(position: {
    lat: number;
    lon: number;
} | null | undefined): string;
/**
 * Join a list, or render {@link EMPTY} when it is empty. Mirrors the existing
 * `arr.join(', ') || 'none'` idiom so an empty collection is explicit.
 */
export declare function listOrNone(items: readonly string[], separator?: string): string;
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