export interface RequireSignedInDeps {
    /** The token that would authenticate a machine call, if any (env override or config). */
    currentToken: () => Promise<string | undefined>;
    /** Emit a line (stderr, so it never pollutes machine-readable stdout). */
    print: (line: string) => void;
}
/**
 * True when a token is present. When absent, prints the L3 not-signed-in message and returns
 * false. The exact copy is locked by the f1 design:
 *   ✗ You're not signed in.
 *     Run `vincentt login` to connect this machine to your Vincentt account.
 */
export declare function requireSignedIn(deps: RequireSignedInDeps): Promise<boolean>;