/**
 * MCP stdio server — plugin mode for Claude Code / Codex. The host's own agent loop
 * drives our tools; no pi and no LLM on this side. Driver/strategy come from env
 * (PI_GUI_DRIVER / PI_GUI_STRATEGY).
 *
 * Uses the low-level Server (not McpServer) so TypeBox schemas — which are plain
 * JSON Schema — pass through without a zod duplicate. stdout is protocol-only.
 */
export declare function serveMcp(): Promise<void>;