We indexed 86,000 Claude Code, Codex and Cursor extensions. Here's what the data shows about the ecosystem.

Skillselion — Wed, 01 Jul 2026 20:15:26 +0000

86,047. That's how many extensions for Claude Code, Codex, and Cursor we index at Skillselion, refreshed every day. We sorted the whole catalog by what each extension actually does. The breakdown says something uncomfortable about where the community spends its time.

The catalog in numbers

Across Claude Code, Codex, Cursor, and other coding agents this week:

86,047 extensions total
65,933 agent skills
9,828 plugin marketplaces
7,901 MCP servers
2,385 plugins
120.2 million recorded installs

Skills make up 77% of the catalog. One skill is one SKILL.md file, so anyone with a text editor and a git push ships one.

What everyone is building

Sort by the job each extension does and the pattern jumps out:

Agent tooling: 37,265 (context, memory, orchestration, sub-agents)
Integrations: 12,165 (agents wired to APIs and services)
Backend: 6,786
Frontend: 5,070
Security and review: 2,386
Docs: 1,897

Agent-tooling beats backend, frontend, docs, and security put together. Developers sharpen the agent before they point it at the actual product.

The gap almost nobody is working

Now count the extensions for shipping and growing a product instead of building it:

Launch and distribution: 627
App store optimization: 107
Generative engine optimization: 71
Audience and positioning: 84

Seventy-one extensions help you get your work in front of users. Thirty-seven thousand help the agent write code. If you build for these agents and want a niche nobody has crowded, that space is wide open.

The real problem is finding the one you need

66,000 skills is not too few. It's too many to hold in your head. You won't remember a skill exists at the moment you need it, and you won't scroll a 66k-row list in the middle of a task.

Two things we lean on:

Rank by installs, not stars. A star means someone bookmarked it. An install means someone ran it. The top of those two lists barely overlaps.
Pull skills in mid-task. We built an MCP that queries the catalog from inside the agent. Describe the gap in plain words, get the top-ranked skill loaded, keep working. It runs in Claude Code, Codex, and Cursor.

See what ranks for your stack

Type your stack into the catalog and watch which skills people actually install, no signup needed: skillselion.com. Or drop the loader, skillselion-mcp, into your agent and let it pull the right skill the next time you hit a wall.