I Built an AI Skill That Writes LinkedIn Posts — And Then Used It to Write This Post

I built an AI skill that writes LinkedIn posts. Then I used that skill to write the LinkedIn post about it. That's either very meta or very efficient. Probably both. What Even Is a Claude Code Skill? A skill is a folder with a Markdown file inside it. That Markdown file teaches Claude exactly how to handle a specific task — your tone, your format, your rules, your quirks. No Python. No backend. No complex config. Just structured instructions. The folder goes in ~/.claude/skills/. You invoke it with a slash command. Claude reads the instructions and executes them. That's it. The entire mechanism. ~/.claude/skills/ └── linkedin-post-creator/ └── SKILL.md ← this is the whole thing It sounds too simple until you actually build one and realise how much you've just automated. How Skills Are Loaded (The Smart Part) What makes this more than just a text file is Claude's progressive disclosure model: Level 1 — always loaded: just the skill name and description (token-cheap, always visible) Leve