agentskills.io (open standard + registry)
Leading#5 in Skillshigh confidence
The open Agent Skills spec and directory (~23k★) — discover SKILL.md skills that work across Claude Code, Codex, Gemini CLI, Cursor and more.Our read
Why it ranks #5
~23.4k GitHub stars plus support across Claude Code, Codex, Gemini CLI and Cursor make agentskills.io the central open specification rather than another vendor-specific skill list.Here is the catch
compatibility details still differ between host agents
the open format does not guarantee skill quality or security
registry coverage is smaller than broad community lists
Does this well
reduces lock-in through a simple portable format
supported by several major coding-agent ecosystems
clear reference material for skill authors
Pricing
Checked by hand on 2026-07-23. Prices in this category change often — if this looks wrong, it probably is.
Key features
portable Agent Skills specificationSKILL.md authoring guidancecross-agent compatibilitypublic skill discovery
Sources we read
Quick facts
More in this area
The rest of the Skills column.- 1SuperpowersThe recognized leader of the Claude Code skills ecosystem (~260k★): composable SKILL.md skills chaining brainstorming, planning, subagent-driven TDD and code review.
- 2Anthropic Skills (official)Anthropic's official SKILL.md skill library (~164k★) — production-grade skills like webapp testing, MCP-server building and document editing that any agent can load.
- 3awesome-claude-skillsThe most-starred curated directory of Agent Skills (~70k★): one place to discover and install community SKILL.md skills for coding and beyond.
- 4Vercel Agent SkillsVercel's official SKILL.md collection (~29k★): React/Next.js performance and composition best-practices plus project auditing and instant deploys.
- 6Trail of Bits SkillsSecurity-focused SKILL.md skills from a top audit firm (~6k★) — CodeQL and Semgrep vulnerability detection wired into the agent's workflow. Niche but high-signal.
- 7DietrichGebert/ponytailRuleset that pushes coding agents down a ladder — reuse, stdlib, one-liner — before writing new code, plus over-engineering review and audit commands.