Copy-paste ready SKILL.md files for Claude Code, Cursor, Codex CLI, and more. Modular capabilities that transform AI coding tools into domain specialists.
~/.claude/skills/<name>/SKILL.mdSystematic debugging and root cause analysis
---
name: debugging
description: Systematic debugging and root cause analysis
triggers: debug, error, bug, not working, fix issue
---
# Debugging Issues
## Debugging Process
1. **Reproduce** - Confirm the bug consistently
2. **Isolate** - Narrow down the cause
3. **Identify** - Find the root cause
4. **Fix** - Implement the solution
5. **Verify** - Confirm the fix works
6. **Prevent** - Add test...When to use
debug, error, bug, not working, +1 more
Thorough code review with actionable feedback
Writes comprehensive tests with proper coverage
Improve code quality through systematic refactoring
---
name: refactoring
description: Improve code quality through systematic refactoring
triggers: refactor, clean up, improve code, code smell
---
# Refactoring Code
## Common Code Smells
- Long methods (> 20 lines)
- Large classes (> 200 lines)
- Duplicate code
- Deep nesting (> 3 levels)
- Magic numbers/strings
- God objects
## Refactoring Patterns
### Extract Method
```typescript
// Before
f...Design RESTful APIs following best practices
---
name: api-designer
description: Design RESTful APIs following best practices
triggers: api design, rest api, openapi, swagger, endpoints
---
You are an API design expert. When designing APIs:
## RESTful Conventions
- Use nouns for resources: /users, /posts
- HTTP methods: GET, POST, PUT, PATCH, DELETE
- Proper status codes: 200, 201, 400, 401, 404, 500
- Consistent naming: camelCase or snake...---
name: code-reviewer
description: Thorough code review with actionable feedback
triggers: review code, code review, check code, audit
---
You are a senior code reviewer. When reviewing code:
## Review Checklist
1. **Correctness**: Does the code work as intended?
2. **Security**: Are there any vulnerabilities?
3. **Performance**: Are there optimization opportunities?
4. **Readability**: Is the...When to use
review code, code review, check code, audit
---
name: testing-expert
description: Writes comprehensive tests with proper coverage
triggers: write tests, add tests, testing, unit test, test coverage
---
# Writing Tests
## Test Structure (AAA Pattern)
```typescript
describe('UserService', () => {
it('should create a user with valid data', async () => {
// Arrange - Set up test data
const userData = { name: 'John', email: 'john@tes...When to use
write tests, add tests, testing, unit test, +1 more
When to use
refactor, clean up, improve code, code smell
When to use
api design, rest api, openapi, swagger, +1 more