If you use Claude Code every day, you've probably found yourself typing the same instructions over and over:
"Review this code for bugs"
"Generate a test for this function"
"Write a commit message for these changes"
I got tired of that pattern and started collecting reusable prompts — "skills" — that I could drop into any project. After months of iterating, I've got a pack of 50. Here are 10 of them that save me the most time.
The best part? They're all free — just clone and use.
1. Auto Commit Messages
The skill that started it all. It reads git diff --cached and generates conventional commit messages.
Why it works: It enforces the type(scope): description format and writes a body explaining why, not how. No more "fixed stuff" in your git log.
claude -p "$(cat skills/01-auto-commit.md)"
Example output:
feat(auth): add JWT token rotation
Implement automatic token refresh when the existing token is within 5 minutes
of expiry. The refresh endpoint validates the current token before issuing a
new one with an extended TTL.
Closes #142
2. Code Review Assistant
This one runs on every PR diff before I push. It catches logic bugs, security vulnerabilities, and performance issues — formatted with severity tags so I know what to fix first.
claude -p "$(cat skills/02-code-review.md)" -p "$(git diff main)"
Output format:
🔴 HIGH — sql_injection_risk in users.ts:45
→ Raw string interpolation in SQL. Use parameterized query.
→ Fix: db.query('SELECT * FROM users WHERE id = $1', [userId])
🟡 MEDIUM — memory_leak in websocket.ts:102
→ Event listeners never cleaned up on component unmount.
3. Bug Investigator
When you've been debugging for 30 minutes and getting nowhere, this skill forces a systematic approach instead of more random console.log statements.
It walks through: gather evidence → form hypotheses → diagnostic commands → narrow down.
The key rule: no random fixes. Every diagnosis step has a command to confirm or rule out the hypothesis first.
4. Test Generator
Covers happy path, edge cases, and error states in one pass. If you're testing a React component, it also checks loading/error/empty states — the stuff everyone forgets.
claude -p "$(cat skills/04-test-generator.md)" -p "$(cat src/services/auth.ts)"
5. Project Context Builder
Perfect for onboarding or picking up a legacy project. It reads the architecture, data flow, config, and dependencies, then outputs a structured markdown brief.
I used this on a project that had zero documentation and went from "no idea" to "can ship a bug fix" in 15 minutes.
6. API Documentation Generator
Generates endpoint docs with request format, response schema, auth requirements, and curl examples. It cross-references your OpenAPI spec if one exists.
7. Database Migration Assistant
The most dangerous thing you can do is run a migration that breaks production. This skill detects breaking changes, generates rollback scripts, and flags lock contention on large tables.
For destructive operations, it always suggests a two-phase approach: deploy app first, then migrate data.
8. Refactoring Planner
Never refactor without a safety net. This skill generates a plan that:
- First writes tests to cover current behavior
- Then maps dependencies and side effects
- Then breaks the work into small, reversible steps
- Finally verifies after each step
9. Dependency Audit
Checks for CVEs, license conflicts, and unused dependencies. It goes beyond npm audit by checking if the package is actually maintained and if the license is compatible with your project.
10. Performance Audit
Finds slow code paths, N+1 queries, memory leaks, and configuration gaps. Outputs severity-sorted findings with specific line references and fix suggestions.
Free vs Full
These 10 skills are a free sample. The full pack has 50 skills covering Security, DevOps, Architecture, Cloud, AI/ML Workflows, Frontend, Microservices, and more.
| What you get | Free | Full |
|---|---|---|
| Code Review | ✅ | ✅ |
| Commit Messages | ✅ | ✅ |
| Test Generation | ✅ | ✅ |
| Security Audit | ❌ | ✅ |
| DevOps Automation | ❌ | ✅ |
| Architecture Design | ❌ | ✅ |
| AI/ML Workflows | ❌ | ✅ |
| Total skills | 10 | 50 |
| Price | Free | $19 |
Get Started
git clone https://github.com/zhirenhun-stack/claude-code-skills.git
cd claude-code-skills
claude -p "$(cat skills/02-code-review.md)" -p "$(git diff)"
If you find these useful, star the repo — it helps more people find them.
And if you want the remaining 40 skills → Get the Full Pack
Got a skill idea? Open an issue on GitHub. I'm always adding new ones.
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