/**
 * QMD MCP Server - Model Context Protocol server for QMD
 *
 * Exposes QMD search and document retrieval as MCP tools and resources.
 * Documents are accessible via qmd:// URIs.
 *
 * Follows MCP spec 2025-06-18 for proper response types.
 */
/**
 * Periodically check this MCP process's RSS and exit cleanly when it
 * crosses a configurable ceiling, so the parent (Claude Code stdio
 * client, pm2, systemd, etc.) can respawn a fresh process. Contains
 * the blast radius of memory leaks in the search/expansion path
 * without requiring a full re-architecture.
 *
 * Configuration:
 *   QMD_MCP_RSS_LIMIT_BYTES — ceiling in bytes. Default 0 (disabled).
 *     Set to e.g. `2147483648` (2 GiB) to opt in.
 *   QMD_MCP_RSS_CHECK_INTERVAL_MS — poll interval. Default 60000 (60s).
 *
 * Default-off so we can ship the diagnostic + pragma fix safely and
 * graduate the supervisor on once we have soak data showing no
 * false positives. Operators can opt in immediately by exporting
 * `QMD_MCP_RSS_LIMIT_BYTES=2147483648` in their MCP launcher env.
 */
export type RssSupervisorHandle = {
    stop: () => void;
    /** Snapshot the most recent RSS reading (test hook). */
    lastRss: () => number;
};
export interface RssSupervisorOptions {
    /** RSS ceiling in bytes. 0 disables. */
    limitBytes?: number;
    /** Polling cadence in ms. Default 60000. */
    intervalMs?: number;
    /** Override RSS reader for tests. */
    readRss?: () => number;
    /** Override exit hook for tests. */
    onExceeded?: (rss: number, limit: number) => void;
    /** Override stderr writer for tests. */
    log?: (line: string) => void;
}
export declare function startRssSupervisor(opts?: RssSupervisorOptions): RssSupervisorHandle | null;
export declare function startMcpServer(): Promise<void>;
export type HttpServerHandle = {
    httpServer: import("http").Server;
    port: number;
    stop: () => Promise<void>;
};
/**
 * Start MCP server over Streamable HTTP (JSON responses, no SSE).
 * Binds to localhost only. Returns a handle for shutdown and port discovery.
 */
export declare function startMcpHttpServer(port: number, options?: {
    quiet?: boolean;
}): Promise<HttpServerHandle>;