commands.md vs skill.md -- community guidelines

For the community to effectively contribute custom plugins, it seems like more clarity is needed on the topic of creating the skill.md and the command.md. The Readme defines commands.md as specifically defining the slash commands / explicit actions that get triggered. Whereas skill.md is defined as the domain expertise, best practices, and step-by-step workflows. OK that makes sense; however, looking at the commands.md files, there is a lot more content than just defining the commands and actions. In fact in most examples I've reviewed, there's a lot of overlap. A good example is Legal/skills/contract-review and Legal/commands/review-contract

Additionally, it is unclear how skills get read based on command, and whether the available skills for any command are limited to those that are in the same plugin folder. There are no explicit references to skills in any command file or accompanying plugin json file. I had an entire conversation with Claude about this to try and figure it out and we concluded that it must be reading all skills for any command triggered by the user (but probably only the skills in that same plugin). Can someone clarify this?