export declare function setJsonMode(on: boolean): void;
export declare function isJsonMode(): boolean;
/**
 * Helper for handlers: scan args for output-mode flags.
 *   --json                → force JSON
 *   --output text|json|auto → explicit mode
 * Returns true if an explicit flag was found (so the caller knows the
 * user/agent expressed an intent vs. relying on auto-detection).
 */
export declare function detectJsonModeFromArgs(args: readonly string[]): boolean;
export declare function wasExplicitlySet(): boolean;