What is the biggest AI skills directory?

By raw volume, the automatic indexes win: skills.sh reports on the order of 970,000 installs across skills auto-indexed from GitHub, and mcpservers.org lists 3,000+ skills. Big is not the same as checked — those indexes do little or no per-skill curation.

What is the best AI skills library for beginners?

For guided learning, AI Agents Library pairs a small, fully-written-out catalogue with training and setup help. For installing into an assistant and getting on with it, a directory with copy-paste install prompts — Skill Harbor for Muse — removes the manual steps.

Are AI skills directories free to use?

Browsing is free everywhere we checked. The money differs: open indexes are free throughout; AI Agents Library gives the text free and sells downloadable files plus training in a $14/month pass; Skill Harbor listings are free or priced by their creators, paid directly to the seller.

Who wrote this comparison?

Skill Harbor — one of the directories in the table. We disclose that up front, we state the check date, and each competitor entry names at least one place where it beats us. Verify anything load-bearing on the directory's own site before you rely on it.

Best AI Skills Libraries and Directories, Compared Honestly

Disclosure first: this page is published by Skill Harbor, one of the directories below. We are not going to pretend otherwise. What we can do is state our check date (October 11, 2026), compare on facts you can verify, and name — for every competitor — at least one place where it beats us.

The short version

There are three kinds of places to find AI skills. Automatic indexes (skills.sh, mcpservers.org) crawl GitHub and list enormous numbers of skills with little or no curation. Curated libraries (AI Agents Library, agenticskills.io) keep a small catalogue a person has actually written or reviewed. Open marketplaces/directories (Skill Harbor) sit between: a large catalogue, but every listing is a real product page from an identified creator, with an install prompt that does the work. Which one is "best" depends entirely on whether you want volume, guidance, or installation.

Compared

Directory	Type	Size (checked Oct 2026)	Curation	Platforms	Cost model
Skill Harbor (us)	Open directory / marketplace	2,300+ listings	Every listing reviewed; install prompts validated at insertion; creators can be identity-verified	Muse today, more coming	Free listings + paid listings priced by creators, paid to the seller, 0 commission
skills.sh (Vercel)	Automatic index	~970K installs reported	None — auto-indexed from GitHub	Many agent tools	Free
mcpservers.org	Index + protocol presence	3,000+ skills	Light	MCP ecosystem	Free
AI Agents Library	Curated library + training	67 public skills (we counted)	High — one author writes every skill and page	Claude, ChatGPT, Gemini Spark, Muse	Text free; files + training in a $14/mo pass
agenticskills.io	Curated library	193+ skills, 16 categories	Curated, with S/A/B tiers	Agent tools generally	Free + newsletter
agentic-awesome-skills (GitHub)	GitHub library	1,962+ skills	Maintainer-curated list	Agent tools generally	Free, open source

Where each one beats us

skills.sh beats us on volume and plumbing. If you want the firehose — every skill published to GitHub, installable from a CLI — that is the firehose. We will never out-crawl it, and we do not try: our bet is that a checked listing beats a raw index entry when a beginner is deciding what to run.

mcpservers.org beats us on being wired into the agents themselves. It shows up inside the search protocols agents use, so discovery happens without a human ever visiting a website. That is a distribution trick worth respecting — and copying, eventually.

AI Agents Library beats us on teaching. Every one of its 67 skills comes with a long guided page, worked examples and a training academy behind it. If you are a non-technical business owner who wants to be taught, not just handed a listing, their hand-holding is ahead of ours today.

agenticskills.io beats us on ranking transparency. Its S/A/B tiers tell you at a glance what the curator thinks is best. Our listings carry verification and test badges, but not a curator's league table.

agentic-awesome-skills beats us on GitHub-native simplicity. One repo, everything in the open, no account, no website to trust. For developers who live in Git, that is hard to argue with.

Where we think Skill Harbor wins

Installation: every listing carries a copy-paste install prompt — your Muse fetches, safety-checks, installs and verifies. Nobody else in this table makes the agent do the whole install as the default flow.
One assistant, done properly: everything here is built and tested for Muse first, instead of being generic across ten tools.
Creators are real parties to the deal: creators claim their pages, set their own price and checkout, and get paid directly. A listing here is a storefront, not just an index card.
Bilingual: the directory, the listings and the install prompts run in English and French.

How to choose

Want everything that exists, and you can vet code yourself → skills.sh or the GitHub library.
Want to be taught, step by step, as a beginner → AI Agents Library.
Want a curator's shortlist → agenticskills.io.
Want skills for Muse, installed by your agent, from identified creators → that's us.

Frequently asked questions

What is the biggest AI skills directory?: By volume, the automatic indexes — skills.sh and mcpservers.org. Big is not the same as checked.
What is the best library for beginners?: For guided learning, AI Agents Library. For installing into Muse and moving on, a copy-paste install directory like this one.
Are these directories free?: Browsing is free in all six. The paid layers differ: training passes there, creator-priced listings here.
Who wrote this comparison?: Skill Harbor — see the disclosure at the top. Check dates and claims on each directory's own site.

Browse the directory Skills for Muse