Guides

Learn the format, not just the folklore.

Four in-depth explainers based on public Anthropic and OpenAI documentation. We cite the source pages so you can verify every claim.

Progressive disclosure, where Skills run, pre-built document Skills, and the security habits that matter.

Frontmatter rules, third-person descriptions, folder layout, and the checklist to run before you share a Skill.

What differs, what OpenAI’s late-2026 GPT retirement means, and how to write instructions that survive a move.

Techniques that official Anthropic and OpenAI docs still recommend, plus when a repeated prompt should become a Skill.