export interface ClientMessageEnvelope {
    type: string;
    data?: unknown;
    /** REQUIRED for type=action (per client_action.schema.json), optional otherwise. */
    match_id?: string;
    /** REQUIRED for type=action (v1.2 enforcement 2026-07-16): the echo of
     *  action_request.data.request_id. ajv rejects an id-less action outbound. */
    request_id?: string;
    /** Only meaningful for type=action (protocol v1.1): optional model usage
     *  metadata — token counts only. ajv enforces the inner shape. */
    usage?: unknown;
}
export interface ServerMessageEnvelope {
    type: string;
    data: unknown;
    match_id?: string;
}
/** Warm the ajv cache up-front. Optional — getAjv() is lazy and
 *  serializeClientMessage / parseServerFrame call it on first use. */
export declare function initFrameHandler(): void;
/** Test-only: drop the ajv singleton so the next getAjv() call
 *  rewalks loadAllSchemas(). Pairs with __resetSchemasRootCache()
 *  in protocol/schemas.ts. NOT exported from src/index.ts. */
export declare function __resetFrameHandlerCache(): void;
export declare function serializeClientMessage(msg: ClientMessageEnvelope): string;
export declare function parseServerFrame(raw: string | Buffer): ServerMessageEnvelope;