Claude Code has become the go-to AI coding agent for tens of thousands of developers. Skills extend what it can do — drop in a SKILL.md and your agent instantly knows how to review PRs, generate documentation, audit dependencies, or scaffold entire features.
With 21,000+ skills in the MDSkill directory, knowing where to start is the hard part. This post cuts through the noise: here are the skills consistently topping the leaderboard by installs, with security scores to back them up.
What makes a skill worth installing?
Before the list, a quick note on how we evaluate:
- Security score (0–100) — our static analyser checks for prompt injection resistance, data handling hygiene, and output surface area
- Install count — real installs tracked via anonymous telemetry (no personal data)
- Description quality — does it explain exactly what the skill does and when to use it?
Top skills for code review
Code review is where Claude Code skills shine hardest. The best ones do more than flag style issues — they catch security vulnerabilities, surface dependency risks, and output structured findings you can act on immediately.
Look for skills in the anthropics and ComposioHQ repositories on the leaderboard. These consistently rank in the top 10 for security score and install volume.
# Install a top code review skill
npx mdskill add anthropics/claude-plugins-official/build-mcp-server
Top skills for documentation
Documentation is the chronic debt of every fast-moving codebase. Skills that automate README generation, changelog authoring, and inline comment writing save hours every sprint.
The writing and docs categories on the directory are a good starting point. Filter by security score to avoid skills that hallucinate API references.
Top skills for security auditing
Security skills are arguably the highest-leverage category. A well-written security skill teaches your agent to spot OWASP Top 10 vulnerabilities, flag outdated dependencies with known CVEs, and output findings in a structured format your team can triage.
Browse the Security category for the current top performers.
Top skills for design workflows
If you work at the intersection of design and engineering, design skills are underrated. The best ones can read Figma specs, generate accessible component code, and review designs against your existing design system tokens.
Browse the Design category to find skills compatible with your stack.
How to find the right skill
The fastest way to find a skill that fits your workflow:
- Open the leaderboard and filter by category
- Check the security score — anything below 60 deserves extra scrutiny
- Read the
SKILL.mdcontent on the detail page before installing - Install and test on a real task before committing to your team's shared skills directory
# One-command install
npx mdskill add owner/repo/skill-name
# Or browse first
npx mdskill browse
Building your own
The best skill in your stack might not exist yet. If you have a workflow you repeat — a specific PR review format, a documentation template, a custom linting checklist — turn it into a skill, publish it, and let the community vote with installs.
Read How to Build an Agent Skill for a step-by-step guide.