What I'm actually using right now, what I use each one for, and how to install any of them in a couple of minutes.
A skill is a saved set of instructions your AI pulls in when a task matches. Someone has usually already built the one you need, and it's almost always better than the prompt you'd write from scratch.
My rule: start with a task you want off your plate, then go find the skill. Never the other way around. Everything below is free, and the install steps for all of it are in the cheat sheet at the end.
The Five From The Video
Caveman. Makes your agent answer in as few words as possible, with the answer up front and the filler gone. I turn it on for long building sessions in Claude Code where I'm burning tokens on filler. Its own README is honest that a plain "answer concisely" gets you most of the way, so use /ultracave when you want the real savings. My full breakdown: The Caveman Skill.
Last 30 Days. I use it almost every day. Type /last30days and a topic, and it searches the last 30 days of Reddit, Hacker News, X, YouTube and more, ranks posts by real engagement, and hands back one summary with sources. I use it for content research, checking what customers are complaining about, and comparing tools before I pay for one. Reddit and Hacker News work with no API keys, and a 30-second setup wizard adds X, YouTube and TikTok. More here: Last 30 Days.
Awesome Claude Skills. A library of hundreds of skills for sales, design, competitor research and more. I browse it before I build anything myself. Two worth trying first: lead-research-assistant and competitive-ads-extractor.
Marketing Skills. About 50 marketing skills from Corey Haines covering copy, SEO, conversion and A/B tests. Run product-marketing first. It writes one file about your product and audience that every other skill reads. Then try copywriting, cro, ai-seo and marketing-council.
Superpowers. For coding agents like Claude Code. It makes the agent clarify what you actually want, write a plan, build it with tests, and review its own work. It's the difference between "it built something" and "it built the right thing."
Design.UI UX Pro Max and Taste are the two I love for anything visual Claude builds, so it stops looking like every other AI website. More in 5 AI Design Skills.
Marketing and research (ones I built).
Competitor Ad Spy reads competitors' longest-running ads and turns them into ideas for my brands.
The YouTube skill watches videos for me. I use it to reverse engineer viral creators and analyze competitors.
Email Flows Audit reviews an entire email program and ranks the fixes.
Marketing Brain is ten years of my marketing experience in one file, so AI gives advice the way I would.
Decisions.The LLM Council gives me five advisers who argue with each other instead of agreeing with me.
Life. A morning briefing, a wardrobe stylist, dinner planning, a financial pulse and a home maintenance tracker. All five are in 5 Claude Skills That Run My Entire Life.
Install Any Of Them
In claude.ai you upload a skill as a zip. In Claude Code you install it with two commands. Everything is below, including the checks I run before installing anything.
Skill Install Cheat Sheet
SKILL INSTALL CHEAT SHEET
From Learn AI With Mariah
----------------------------------------------------------------
IN CLAUDE.AI (web or desktop app)
----------------------------------------------------------------
1. Settings > Capabilities > turn on "Code execution and file creation"
(called "Create and edit files" in the newer Settings layout)
(Team/Enterprise: your admin turns it on under Plugins & skills)
2. Customize > Skills > + > Create skill > Upload a skill
3. Upload the skill as a .zip (a folder with a SKILL.md inside)
----------------------------------------------------------------
IN CLAUDE CODE (type these inside a Claude Code session)
----------------------------------------------------------------
CAVEMAN
/plugin marketplace add JuliusBrussee/caveman
/plugin install caveman@caveman
Then: /caveman (or /ultracave for even shorter, "stop caveman" to turn off)
LAST 30 DAYS
/plugin marketplace add mvanhorn/last30days-skill
/plugin install last30days
Then: /last30days [any topic, person or company]
claude.ai version: download last30days.skill from the repo's Releases page
and upload it under Customize > Skills.
MARKETING SKILLS
/plugin marketplace add coreyhaines31/marketingskills
/plugin install marketing-skills
Run product-marketing FIRST so every other skill knows your product.
claude.ai version: download one <skill>-claude-web.zip per skill from Releases.
SUPERPOWERS (coding agents only)
/plugin install superpowers@claude-plugins-official
Test it: "Let's make a react todo list." It should ask questions before coding.
AWESOME CLAUDE SKILLS (pick individual skills, no single install)
Browse github.com/ComposioHQ/awesome-claude-skills, then:
- claude.ai: zip the skill's folder and upload it
- Claude Code: copy the folder into ~/.claude/skills/
----------------------------------------------------------------
IN CODEX, CURSOR, GEMINI CLI AND OTHER AGENTS
----------------------------------------------------------------
npx skills add JuliusBrussee/caveman -g
npx skills add mvanhorn/last30days-skill -g
npx skills add coreyhaines31/marketingskills
gemini extensions install https://github.com/obra/superpowers
----------------------------------------------------------------
BEFORE YOU INSTALL ANY SKILL
----------------------------------------------------------------
- Read the SKILL.md. It's plain English. If you can't tell what it does, skip it.
- Check who made it, how many stars it has, and when it was last updated.
- Be extra careful with skills that run scripts or ask for API keys.
- Never paste passwords or keys into a skill file.
How to set it up. Two ways:
Not technical? Use the claude.ai steps. Last 30 Days and Marketing Skills both ship ready-made uploads on their Releases pages.
Using Claude Code? Paste the two commands for the skill you want into a session, then call it with its slash command.
Read a skill before you install it
A skill is instructions your AI will follow, and some run code on your machine. Read the SKILL.md (it's plain English), check who made it and when it was last updated, and be careful with anything that asks for API keys.
Want to share your whole setup with your team in one link? That's Skill Packs.