Start Here
The one prompt
Open Claude Code and paste this. It installs all three, checks each one actually landed, and tells you what to type first to test them.
It also catches the two mistakes that make these look installed when they are not. Those are the reason most people give up on this.
Not in Claude Code? Skip to the manual paths below. Everything works in the browser too, it just takes clicking instead of pasting.
Copy-paste prompt
You are setting up three free, open-source Claude plugins on my machine. Install all three, verify each one, then report back. Do them in this order, and confirm each one worked before moving to the next. 1) last30days An agent-led search across Reddit, X, YouTube, TikTok, Hacker News, Polymarket, GitHub and arXiv, scored by what real people actually engaged with. Repo: https://github.com/mvanhorn/last30days-skill (built by mvanhorn) Install through the Claude Code marketplace, which handles updates on its own: /plugin marketplace add mvanhorn/last30days-skill /plugin install last30days If the marketplace command is not available, use this instead: npx skills add mvanhorn/last30days-skill -g -a claude-code Do not install it both ways. Claude Code does not dedupe across install methods, so /last30days will show up twice and you will not know which one is running. 2) marketing skills Adds 40+ real marketing skills: conversion optimization, SEO, copywriting, ads, cold email, pricing, analytics, churn. Repo: https://github.com/coreyhaines31/marketingskills (built by Corey Haines) Install with: npx skills add coreyhaines31/marketingskills -a claude-code The -a claude-code flag is not optional. Run this from inside an agent session without it and the CLI installs to .agents/skills/, which Claude Code does not read. Everything will look like it worked and nothing will actually load. If I would rather pick specific skills than install all of them, show me the list first: npx skills add coreyhaines31/marketingskills --list 3) prompt master Writes the prompt for me. I describe what I want in normal words, it asks two or three questions, then hands back the finished prompt built for whichever tool I am using. Repo: https://github.com/nidhinjs/prompt-master (built by nidhinjs) Install with: mkdir -p ~/.claude/skills git clone https://github.com/nidhinjs/prompt-master.git ~/.claude/skills/prompt-master Once all three are in, verify: - List what is now installed and confirm each of the three appears exactly once. - Flag any duplicates and tell me which copy to delete and the command to delete it. - Give me the exact command or phrase that triggers each one. Then report back in plain English: - What installed cleanly. - What did not, with the specific error and the specific fix. - The first thing I should type to test each of the three. Do not tell me something worked unless you actually checked. If an install failed, say so plainly and give me the fix.
The Three
What each one actually does
last30days
Built by mvanhorn. View the repo
An agent-led search across Reddit, X, YouTube, TikTok, Hacker News, Polymarket, GitHub and arXiv, scored by what real people actually engaged with instead of what an editor ranked.
Google gives you the LinkedIn profile from 2023. This gives you what someone or something has actually been doing this month, pulled from the places Google never touches.
How you trigger it: /last30days [topic or person]
marketing skills
Built by Corey Haines. View the repo
Adds 40+ real marketing skills to Claude: conversion optimization, SEO, copywriting, ads, cold email, pricing, analytics, churn prevention, competitor research.
Ask Claude to fix your landing page without this and it guesses. With this it runs an actual playbook written by someone who has run growth for real companies.
How you trigger it: Ask in plain words: "audit the copy on my landing page"
prompt master
Built by nidhinjs. View the repo
Writes your prompt for you. You describe what you want in normal words, it asks two or three questions, then hands back the finished prompt built for whichever tool you are pointing it at.
Stops the loop where you write a vague prompt, get the wrong thing, rewrite, get closer, rewrite again, and finally get it right on the fourth try.
How you trigger it: /prompt-master, or just "write me a prompt for..."
Every Other Way In
If you are not in Claude Code
The prompt above only works where Claude can run commands. If you use Claude in the browser or the desktop app, here is the manual path for each surface.
Claude Code
The prompt above does all three. This is the manual version if you would rather run the commands yourself.
claude.ai in the browser
No terminal, so these are uploads. Go to Sidebar, Customize, Skills, Upload a skill. About 2 minutes for all three.
Claude Desktop
Only last30days ships a desktop bundle. The other two run through claude.ai or Claude Code.
Read Before You Install
The 5 things that quietly break this
None of these throw an error. They just make the plugins sit there doing nothing while you assume they are working.
The flag everyone forgets
Installing marketing skills without -a claude-code puts it in .agents/skills/, which Claude Code does not read. The install reports success. Nothing loads. This one wastes the most time.
Do not install last30days twice
The marketplace install and the npx skills install can both run, and Claude Code will not dedupe them. You get two /last30days entries and no idea which one is live. Pick one method per machine.
last30days is free on the sources that matter
Reddit, Hacker News, Polymarket and GitHub work the second you install it, no keys. X, YouTube and TikTok need a 30-second setup wizard the first time you run it.
Marketing skills has a foundation file
The product-marketing skill is the one every other skill reads first. Fill that one out about your business before you use the rest, or the other 40 are working blind.
You do not need all 40
Run npx skills add coreyhaines31/marketingskills --list and install only the ones you will use. A smaller set is easier to remember you have.
Credit
I did not build any of these
All three are other people's work, given away free. The only thing here that is mine is the install prompt and the list of things that break.
last30days is by mvanhorn. Marketing skills is by Corey Haines, who has run growth for real companies and released the whole library under MIT. Prompt master is by nidhinjs.
If any of these save you real time, go star the repo. That is the whole payment these people asked for.