| name | code-review-skill |
| description | Provides comprehensive code review guidance for React 19, Vue 3, Angular 17+, Svelte 5, Rust, TypeScript, Java, PHP, Python, Django, Go, C#/.NET, Kotlin, Swift, NestJS, C/C++, and more.
Helps catch bugs, improve code quality, and give constructive feedback.
Use when: reviewing pull requests, conducting PR reviews, code review, reviewing code changes,
establishing review standards, mentoring developers, architecture reviews, security audits,
checking code quality, finding bugs, giving feedback on code.
|
| allowed-tools | ["Read","Grep","Glob","Bash","WebFetch"] |
Code Review Skill
Transform code reviews from gatekeeping to knowledge sharing through constructive feedback, systematic analysis, and collaborative improvement.
When to Use This Skill
- Reviewing pull requests and code changes
- Establishing code review standards for teams
- Mentoring junior developers through reviews
- Conducting architecture reviews
- Creating review checklists and guidelines
- Improving team collaboration
- Reducing code review cycle time
- Maintaining code quality standards
Core Principles
1. The Review Mindset
Goals of Code Review:
- Catch bugs and edge cases
- Ensure code maintainability
- Share knowledge across team
- Enforce coding standards
- Improve design and architecture
- Build team culture
Not the Goals:
- Show off knowledge
- Nitpick formatting (use linters)
- Block progress unnecessarily
- Rewrite to your preference
2. Effective Feedback
Good Feedback is:
- Specific and actionable
- Educational, not judgmental
- Focused on the code, not the person
- Balanced (praise good work too)
- Prioritized (critical vs nice-to-have)
❌ Bad: "This is wrong."
✅ Good: "This could cause a race condition when multiple users
access simultaneously. Consider using a mutex here."
❌ Bad: "Why didn't you use X pattern?"
✅ Good: "Have you considered the Repository pattern? It would
make this easier to test. Here's an example: [link]"
❌ Bad: "Rename this variable."
✅ Good: "[nit] Consider `userCount` instead of `uc` for
clarity. Not blocking if you prefer to keep it."
3. Review Scope
What to Review:
- Logic correctness and edge cases
- Security vulnerabilities
- Performance implications
- Test coverage and quality
- Error handling
- Documentation and comments
- API design and naming
- Architectural fit
What Not to Review Manually:
- Code formatting (use Prettier, Black, etc.)
- Import organization
- Linting violations
- Simple typos
Review Process
Phase 1: Context Gathering (2-3 minutes)
Before diving into code, understand:
- Read PR description and linked issue
- Check PR size (>400 lines? Ask to split)
- Review CI/CD status (tests passing?)
- Understand the business requirement
- Note any relevant architectural decisions
For large diffs, pipe the diff through scripts/pr-analyzer.py (git diff main...HEAD | python scripts/pr-analyzer.py) to triage complexity and get a suggested review approach before reading.
Phase 2: High-Level Review (5-10 minutes)
- Architecture & Design - Does the solution fit the problem?
- Performance Assessment - Are there performance concerns?
- File Organization - Are new files in the right places?
- Testing Strategy - Are there tests covering edge cases?
Phase 3: Line-by-Line Review (10-20 minutes)
For each file, check:
- Logic & Correctness - Edge cases, off-by-one, null checks, race conditions
- Security - Input validation, injection risks, XSS, sensitive data
- Performance - N+1 queries, unnecessary loops, memory leaks
- Maintainability - Clear names, single responsibility, comments
- Reuse - Before accepting new code, search for existing utilities/helpers that could replace it. Check adjacent files and shared modules for similar patterns. See Universal Quality Guide for anti-patterns like parameter sprawl, leaky abstractions, nested conditionals, stringly-typed code, TOCTOU, and no-op updates.
Phase 4: Summary & Decision (2-3 minutes)
- Summarize key concerns
- Highlight what you liked
- Make clear decision:
- ✅ Approve
- 💬 Comment (minor suggestions)
- 🔄 Request Changes (must address)
- Offer to pair if complex
Review Techniques
Technique 1: The Checklist Method
Use checklists for consistent reviews. See Security Review Guide for comprehensive security checklist.
Technique 2: The Question Approach
Instead of stating problems, ask questions:
❌ "This will fail if the list is empty."
✅ "What happens if `items` is an empty array?"
❌ "You need error handling here."
✅ "How should this behave if the API call fails?"
Technique 3: Suggest, Don't Command
Use collaborative language:
❌ "You must change this to use async/await"
✅ "Suggestion: async/await might make this more readable. What do you think?"
❌ "Extract this into a function"
✅ "This logic appears in 3 places. Would it make sense to extract it?"
Technique 4: Differentiate Severity
Use labels to indicate priority:
- 🔴
[blocking] - Must fix before merge
- 🟡
[important] - Should fix, discuss if disagree
- 🟢
[nit] - Nice to have, not blocking
- 💡
[suggestion] - Alternative approach to consider
- 📚
[learning] - Educational comment, no action needed
- 🎉
[praise] - Good work, keep it up!
Severity levels: 🔴 / 🟡 / 🟢 are the three severity tiers used as the standard across all guides in this skill — 🔴 blocks the merge, 🟡 should be addressed, 🟢 is optional. The remaining markers (💡 / 📚 / 🎉) are non-blocking annotations.
Language-Specific Guides
根据审查的代码语言，查阅对应的详细指南：
| Language/Framework | Reference File | Key Topics |
|---|
| React | React Guide | Hooks, useEffect, React 19 Actions, RSC, Suspense, TanStack Query v5 |
| Vue 3 | Vue Guide | Composition API, 响应性系统, Props/Emits, Watchers, Composables |
| Angular 17+ | Angular Guide | Signals, Standalone 组件, RxJS, Zoneless 变更检测, 模板优化 |
| Rust | Rust Guide | 所有权/借用, Unsafe 审查, 异步代码, 取消安全性, 错误处理 |
| TypeScript | TypeScript Guide | 类型安全, async/await, 不可变性 |
| Python | Python Guide | 可变默认参数, 异常处理, 类属性 |
| Django / DRF | Django Guide | 安全审查, N+1 查询, Serializer 反模式, ViewSet, 异步视图 |
| FastAPI | FastAPI Guide | Depends, Pydantic v2 validation, async correctness, sessions/N+1, auth vs authorization, test-driven verification |
| Java | Java Guide | Java 17/21 新特性, Spring Boot 3, 虚拟线程, Stream/Optional |
| PHP | PHP Guide | PHP 8.x type system, PDO, security review, Composer, PHPUnit/PHPStan |
| C# / .NET | C# Guide | C# 12 特性, 异步编程, EF Core 性能, ASP.NET Core, LINQ |
| Go | Go Guide | 错误处理, goroutine/channel, context, 接口设计 |
| Kotlin / Android | Kotlin Guide | 协程, Flow, Jetpack Compose, 空安全, 内存泄漏, 架构模式 |
| Swift / SwiftUI | Swift Guide | Optionals, Swift Concurrency, Sendable/actors, SwiftUI property wrappers, value vs reference types, API design |
| NestJS | NestJS Guide | 依赖注入, 分层架构, DTO 验证, Guard/Interceptor, 循环依赖 |
| Svelte / SvelteKit | Svelte Guide | Runes, Load 函数, Form Actions, Store 迁移, SSR/CSR 边界 |
| C | C Guide | 指针/缓冲区, 内存安全, UB, 错误处理 |
| C++ | C++ Guide | RAII, 生命周期, Rule of 0/3/5, 异常安全 |
| CSS/Less/Sass | CSS Guide | 变量规范, !important, 性能优化, 响应式, 兼容性 |
| Qt | Qt Guide | 对象模型, 信号/槽, 内存管理, 线程安全, 性能 |
Cross-Cutting Guides
Language-agnostic patterns applicable to all code reviews:
| Topic | Reference File | Key Topics |
|---|
| Universal Quality | Universal Quality Guide | Reuse audit, parameter sprawl, leaky abstractions, nested conditionals, stringly-typed code, TOCTOU, no-op updates, redundant state |
Additional Resources
