bin/console ai:platform:invoke

fails because it needs the provider. Since those are configured, what about prompting from the list with a ChoiceQuestion?

If the model is missing, we could prompt with a regular ask, or use the the package someone just released (blanking now where it is) that lists all the models by provider.

Then of course we can ask for the prompt.

More brainstorming: add a --prompt-file option that's the name of a file. Then I could test different providers/models with the identical prompt.

I can make a PR if you think any of these are worthwhile.