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Development & Coding
Code Reviewer / Simplify skill
Runs a structured quality review pass over any code the agent writes or modifies. Checks for logic that could be simplified, functions violating single responsibility, inconsistent patterns, performance issues (N+1 queries, unnecessary re-renders), dead code, and naming clarity. Crucially, it doesn't just flag problems — it fixes them before you see the output.
Why it matters
Technical debt compounds fast when agents ship first drafts. This skill makes every output a second draft. Claude Code ships /simplify built in, and Addy Osmani's skills bring the same review discipline to any agent.
How to install Code Reviewer / Simplify
- With the skills CLI. One command copies the skill into your project:
npx skills add addyosmani/agent-skills --skill code-review-and-quality - In Claude Code, by hand. Copy the
code-review-and-qualityfolder from the repository into.claude/skills/in your project, or into~/.claude/skills/to use it everywhere. - In AGNT. Download AGNT free, then add the skill folder from Skills → Import. It runs with the model you choose, next to your agents, workflows and memory.
Source and maintenance
| Repository | addyosmani/agent-skills |
| Skill folder | code-review-and-quality |
| GitHub stars (13 November 2026) | 117,051 |
| Last commit | 1 Nov 2026 |
| Category | Development & Coding |
| Ranked | #1 in The 100 Best AI Agent Skills in 2027 |
Checked against GitHub on 13 November 2026.
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