Github Copilot had a tool that runs in the terminal for longer I'm pretty confident. I can activate it with syntax "?? <question>" and it'll respond with a command, explaining the parameters. I've been using it quite a bit, for stuff like ffmpeg or writing bash 1-liners.

yep that was the alias during beta

now its just gh copilot

https://docs.github.com/en/copilot/using-github-copilot/usin...

https://github.com/github/gh-copilot