/**
 * Help Command Handler
 * Lists all registered commands or shows help for a specific command.
 */
import type { CommandRegistry } from '../registry.js';
/**
 * Handle the /novel help command.
 *
 * @param args - Positional arguments; args[0] is an optional command name.
 * @param registry - The CommandRegistry instance to query.
 * @param json - When true, return a machine-readable JSON schema instead of prose.
 * @returns Formatted help string (or JSON when `json` is set).
 */
export declare function handleHelpCommand(args: string[], registry: CommandRegistry, json?: boolean): string;
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