--help命令在对自定义命令运行时，将输出如下内容：

Description:
  // Whatever the value of `protected $description = '...';` is

Usage:
  // Whatever the value of `protected $signature = '...';` is
  // (with additional options truncated)

Options:
  // Additional Options as defined in `protected $signature = '...';`

  // All Default options available to each `php artisan ...` command
  -h, --help            Display help for the given command. When no command is given display help for the list command
  -q, --quiet           Do not output any message
  -V, --version         Display this application version
      --ansi|--no-ansi  Force (or disable --no-ansi) ANSI output
  -n, --no-interaction  Do not ask any interactive question
      --env[=ENV]       The environment the command should run under
  -v|vv|vvv, --verbose  Increase the verbosity of messages: 1 for normal output, 2 for more verbose output and 3 for debug

如果您将命令定义为：

<?php

namespace App\Console\Commands;

class MyCutomCommand extends Command {
  protected $signature = 'my-custom-command {--task : Valid Options: A, B, C}';
  protected $description = 'This is a Custom Command';

  public function handle() {
    // Command Logic...
  }
}

当你运行php artisan my-custom-command --help时，你会看到上面的内容，或者更具体地说：

在你的例子中，如果你的有效选项是动态的（或者太长），你可以这样调整你的代码：

private $validOptions = ['Long', 'List', 'of', 'Options'];

public function __construct() {
  // $validOptions = DB::table('valid_options')->pluck('name');, etc etc
  
  $this->signature = 'my-custom-command {--task : Valid Options: ' . implode(', ', $this->validOptions) . '}';

  parent::__construct();
}

文件：
https://laravel.com/docs/10.x/artisan#input-descriptions