/**
 * Search topic keyword appendage (DESIGN.md §7 — T03).
 *
 * Providers that lack a native topic parameter (Z.AI, MiniMax) express
 * a non-`general` topic by appending a keyword to the query string.
 * This is adapter-owned field mapping performed inside each Adapter's
 * `invoke()`, never at the command layer. The Tavily adapter passes the
 * topic natively (T04) and does not use this helper.
 *
 * Guard: when the query already ends with the topic word
 * (case-insensitive) the appendage is skipped, so `"rust news"` with
 * `--topic news` stays `"rust news"` rather than `"rust news latest news"`.
 */
import type { SearchTopic } from "../capabilities/search.js";
/**
 * Append the topic keyword to `query` unless the topic is `general`,
 * absent, or the query already ends with the topic word. Returns the
 * query unchanged in all skip cases.
 */
export declare function applySearchTopic(query: string, topic: SearchTopic | undefined): string;
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