Customizing help for a command programmatically (UsageMessageSpec?)

[snicoll]

Hello,

I am trying to improve the output of mycli help my-command, largely into providing more context about what the parameters mean and what is possible. In short, it's really about adding more text in specific areas, not the layout of the output itself. One example of that is the header field of @Command where I envision quite a bit of text to explain what the command actually does.

I can see the various annotations let me do that but I'd prefer adding this in code rather as large piece of text within the annotation itself. For version I can implement IVersionProvider and get a callback. I was wondering if picocli has a model of the help output that would let me hook into it and add additional data?

Thanks!