MCP and Skill Market
How to tell a genuinely useful MCP server or Agent Skill from a popular but abandoned one, and where to browse a catalog that keeps itself current.
Why a catalog matters
Installing an MCP server or an Agent Skill is easy. Choosing a good one is not. Most discovery still happens through long "awesome" lists where a project with ten thousand stars sits next to one that was abandoned two years ago, and nothing on the page tells you which is which.
A useful catalog does more than list names. It sorts projects, keeps metadata fresh, and gives you enough context to judge whether a server or Skill deserves a place in your agent.
How to judge an MCP server
Before you connect anything to a client, check four things.
How to judge an Agent Skill
Skills ship as plain files, so the quality question is different from a server.
What catalogs actually contain
Discovery is unevenly distributed. Developer tooling dominates the server side, while Skills cluster around research and review work. Knowing the shape of the ecosystem keeps you from searching in the wrong place.
| Type | Category | Relative volume |
|---|---|---|
| MCP server | Developer tools | By far the largest group |
| MCP server | API development | Small but steady |
| MCP server | Browser automation | Small and growing |
| MCP server | Productivity workflow, database management, communication | Niche |
| Agent Skill | Research | Largest Skill group |
| Agent Skill | Code review | Second largest |
| Agent Skill | Writing, data analysis | Sparse |
If you need a server for something unusual, expect few options and read them carefully. If you need a research or code review Skill, you will have real choice.
How to read rankings and trending lists
Every catalog ranks differently, and any ranking you see is a proxy rather than a verdict. Three things are worth checking before you trust a placement.
Adoption, maintenance activity, and raw popularity are different metrics. A list sorted by stars answers a different question than one sorted by health.
A catalog that refreshes from source repositories reflects a project's current state. A hand-edited list decays quietly and keeps recommending dead projects.
If a ranking never states what it ranks by, treat it as a browsing starting point rather than a recommendation.
Where to browse a maintained catalog
MCP Markets is a directory for MCP servers and Agent Skills that we work alongside. It tracks several thousand servers and Skills, refreshes its inventory from source repositories on an hourly basis, and ranks servers by community adoption and maintenance health rather than by raw star count.
It is organized the way the table above suggests: developer tools make up the bulk of the server side, while research and code review lead the Skill side. The catalog also publishes focused ranking pages, so you can start from the client you already use instead of browsing everything.
If you want a single entry point, open MCP Markets, pick your client or category, and read the maintenance signals before installing anything.
Getting your own project listed
If you maintain a server or a Skill, a catalog listing is one of the cheapest ways to be found by people who are already looking for exactly what you built. Most directories accept submissions for free and ask for a repository link rather than a paid placement.
Before submitting, make sure the repository has a readable description, a working install path, and a clear statement of which permissions the project needs. Those three things are what both catalogs and their readers screen for.