skills/README.md
Agent skills for working in this repository: focused guides that capture preferences which are useful but impractical to enforce with a lint rule of our own (see #12370).
Each skill lives in its own directory with a SKILL.md file:
skills/<name>/SKILL.md
SKILL.md uses YAML front matter with a name and a description (what the skill does and when to use it), followed by the guidance in Markdown. This is the portable format used by tools such as Vercel's skills package and Claude Code.
rule-performance — defer expensive TypeScript type lookups behind cheap AST/syntactic guards when writing or reviewing typed lint rules.