export interface JsonRpcMessage {
    jsonrpc?: string;
    id?: number | string | null;
    method?: string;
    params?: Record<string, unknown>;
    result?: unknown;
}
export interface JsonRpcResponse {
    jsonrpc: '2.0';
    id: number | string | null;
    result?: unknown;
    error?: {
        code: number;
        message: string;
    };
}
/**
 * Handle one JSON-RPC message. Returns the response, or null when the message
 * needs none (notifications, client responses).
 */
export declare function handleMcpMessage(msg: unknown): Promise<JsonRpcResponse | null>;