Some of these things are documented. For example the model in frontmatter in skills is documented here: https://code.claude.com/docs/en/skills#frontmatter-refer

Some of these things are documented. For example the model in frontmatter in skills is documented here: https://code.claude.com/docs/en/skills#frontmatter-reference https://code.claude.com/docs/en/skills#frontmatter-reference (It's not easy to find though, and lots of other docs doesn't mention it or link to this)