/**
 * Client-side helper for handing a local trail off to a running Principal
 * desktop app (electron-app) over its MCP bridge HTTP surface.
 *
 * Preferred over the Unix-socket handoff (viewer-ipc.ts) when the desktop app
 * is running: the bridge's `POST /api/file-city/trail/activate` route reads the
 * same on-disk trail store the app persists to, so a *local* trail id resolves
 * and opens in the app without a network fetch or GitHub token. Returns false
 * (caller falls back to the standalone viewer) when the app isn't running, the
 * probe times out, or the app doesn't have that trail.
 *
 * Duplicated rather than shared because cli and electron-app are independent
 * packages in separate repos — the HTTP route is the contract, this module
 * speaks it from the producer side.
 */
/**
 * Ask a running desktop app to open `trailId` from its local store. Returns
 * true only when the app actually surfaced the trail — i.e. it found the id AND
 * opened/focused a window (or broadcast the payload to an open one). A 404 (app
 * running but trail not in its store) or a no-window result returns false so the
 * caller can fall back to the standalone viewer.
 */
export declare function handoffToBridge(trailId: string): Promise<boolean>;
/**
 * Ask a running desktop app to open `topicId` from its local store. Mirrors
 * `handoffToBridge` but targets the topic activate route.
 */
export declare function handoffTopicToBridge(topicId: string): Promise<boolean>;
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