/**
 * Login tool - initiates device auth flow then polls for approval.
 * Returns the URL immediately while polling in the background.
 * If polling completes within a reasonable time, returns success.
 * If not, stores the flow state so a subsequent call can check.
 */
export declare function loginTool(): Promise<{
    content: {
        type: string;
        text: string;
    }[];
}>;
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