Addy Osmani's Agent Skills Collection: Guide and Install
Addy Osmani's agent-skills GitHub collection explained with install guide and marketplace comparison.
Quick Answer: Addy Osmani's agent-skills (github.com/nicepkg/agent-skills) is a curated, open-source GitHub collection of AI agent skills. It focuses on quality over quantity with hand-picked SKILL.md files. All free. Install by copying SKILL.md files to your agent's .skills/ directory.
Addy Osmani, a senior engineering leader at Google Chrome, has been one of the most visible advocates for AI agent skills in 2026. His agent-skills GitHub repository has become a popular starting point for developers exploring the SKILL.md ecosystem.
What the collection includes
The repository contains curated SKILL.md files covering common development workflows: code review, testing, documentation, refactoring, performance optimization, and accessibility auditing. Unlike larger directories that scrape thousands of skills from GitHub, this collection is hand-picked with a focus on quality.
Each skill follows the standard SKILL.md format and works with any compatible agent including Claude Code, Cursor, OpenCode, Codex CLI, and others.
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How to install
Clone the repository or download individual SKILL.md files. Copy them to your agent's skills directory:
For Claude Code: ~/.claude/skills/
For Cursor: .cursor/skills/ in your project
For Codex CLI: ~/.codex/skills/
For OpenCode: ~/.opencode/skills/
Skills activate automatically on your next agent session.
How it compares to the Agensi marketplace
Osmani's collection is free, open-source, and curated by a single expert. Agensi is a full marketplace with 1,600+ skills, automated security scanning, creator payments, reviews, and one-command install.
The collections complement each other. Osmani's repo is a good starting point. Agensi gives you breadth, security verification, and premium skills from specialized creators. Many developers use both.
For more free skill options, see best free AI agent skills 2026.