/**
 * Resolve the local Agent Server URL for trusted loopback clients.
 *
 * Prefers `explicit`, then `MDA_CHANNEL_API_URL` / `LANGGRAPH_API_URL`, else
 * `http://127.0.0.1:{PORT|8000}`. `LANGSMITH_ENDPOINT` is deliberately not
 * consulted: it is the tracing/API endpoint (LangSmith SaaS by default), not
 * this server's origin.
 */
export declare function resolveLoopbackApiUrl(explicit?: string): string;
/**
 * API key for trusted loopback LangGraph SDK clients.
 *
 * Prefers `explicit`, then `LANGSMITH_API_KEY`, else `"local"` (in-process /
 * unit-test clients that do not authenticate against Host).
 */
export declare function resolveLoopbackApiKey(explicit?: string): string;
/**
 * Whether `value` addresses this host.
 *
 * Server-local trust (the ingress secret, which lets its holder assert any
 * actor id) must never travel to an off-host origin, so callers gate it on
 * this predicate.
 *
 * @param value - Absolute URL, or a host with an optional port.
 */
export declare function isLoopbackUrl(value: string): boolean;
/**
 * Whether a `Host`-style value (optional port, optional brackets) is loopback.
 *
 * @param host - Host value such as `localhost:8000`, `127.0.0.1`, or `[::1]:80`.
 */
export declare function isLoopbackHost(host: string): boolean;
//# sourceMappingURL=loopback.d.ts.map