How do I do that so that it doesn't get all of the commands, but only the ones I register? I don't want a cache:clear option when running my app.

When I do this, I get ALL the commands. How do I limit them to just a namespace or my selected commands?

$kernel = new Kernel('dev', true); // (bool) $context['APP_DEBUG']);
$kernel->boot();
//
//// Full Symfony app, but we control what commands to register
$application = new Application($kernel);
//
//// Only add specific commands
$container = $kernel->getContainer();
$uploadCommand =  $container->get(UploadCommand::class);
$application->add($uploadCommand);
$application->run();

In that case, you might want to create your own Application class and override the getDefaultCommands() method to return [].

Regarding the cache:clear command, it’s registered via DI. Similarly, your own command doesn’t need to be registered manually if it’s managed by DI.

To exclude certain default commands registered via DI, like CacheClearCommand, you can remove their console.command tag at compile time.

I think what I really want is the opposite, to tag certain commands and only include those.

E.g.

#[AsCommand(...)]
#[AsTaggedItem('myapp.command')] // <-- this probably isn't right.

Then in the app

$taggedServices = $kernel->getContainer()->findTaggedServiceIds('myapp.command');
foreach ($taggedServices as $id => $tags) {
    $application->add($kernel->getContainer()->get($id));
}

But even with $application extending a base command that overwrites getDefaultCommands(), it returns everyting

<?php

namespace App\Console;

use Symfony\Bundle\FrameworkBundle\Console\Application;
use Symfony\Component\Console\Command\CompleteCommand;
use Symfony\Component\Console\Command\DumpCompletionCommand;
use Symfony\Component\Console\Command\HelpCommand;
use Symfony\Component\Console\Command\ListCommand;

class BaseApplication extends Application
{

    protected function getDefaultCommands(): array
    {
        return [new HelpCommand()]; // , new ListCommand(), new DumpCompletionCommand(), new ListCommand()];
        return [new ListCommand()]; //, new CompleteCommand(), new DumpCompletionCommand()];
    }
}

It still shows the entire list, not just my added commands.

Ah! Overwriting registerCommands seems to work:

class BaseApplication extends Application
{
    protected function registerCommands(): void
    {
    }

Thanks! I saw that presentation in Chicago, and I'll likely watch it again next month at Symfony Online. Now that I have a more urgent need I'll review it more closely. Thanks for the link!