/**
 * MCP tool helper that calls the storage-broker Hono routes on localhost and
 * surfaces structured error bodies on non-2xx responses, so a denied request
 * returns the route's `error` reason (e.g. "cross-account") the agent can act
 * on, never a bare status line. Mirrors the WhatsApp call-api helper.
 */
export declare function callApi(baseUrl: string, path: string, method?: "GET" | "POST", body?: unknown, extraHeaders?: Record<string, string>): Promise<unknown>;
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