Skills have been really helpful in my team as we've been encoding tribal knowledge into something that other developers can easily take advantage of. For example, our backend architecture has these hidden patterns, that once encoding in a skill, can be followed by full stack devs doing work there, saving a ton of time in coding and PR review.

We then hit the problem of how to best share these and keep them up to date, especially with multiple repositories. It led us to build sx - https://github.com/sleuth-io/sx, a package manager for AI tools.

Depending on your workflow, none.

While I do agentic development in personal projects a lot at this point, at work it's super rare beyond quick lookups to things I should already know but can't be arsed to remember exactly (like writing a one-off SQL scripts which does batching mutations and similar)