Code Review Checklist
shareAI-lab/learn-claude-code
Reviews code against a five-part checklist covering security, correctness, performance, maintainability and testing, and reports findings in a fixed format.
Review code changes for bugs, security issues, performance problems, and style violations.
Install Code Review
$ npx skills add owainlewis/youtube-tutorials --skill code-review -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install owainlewis/youtube-tutorials code-review --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/owainlewis/youtube-tutorials.git skills-src && mkdir -p .claude/skills && cp -r skills-src/tutorials/pi-coding-agent-guide/resources/04-skills/code-review .claude/skills/code-review && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "code-review" agent skill from https://github.com/owainlewis/youtube-tutorials/tree/main/tutorials/pi-coding-agent-guide/resources/04-skills/code-review into .claude/skills/code-review/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-review", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/owainlewis/youtube-tutorials/tree/main/tutorials/pi-coding-agent-guide/resources/04-skills/code-reviewType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add owainlewis/youtube-tutorials --skill code-review -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install owainlewis/youtube-tutorials code-review --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/owainlewis/youtube-tutorials.git skills-src && mkdir -p .agents/skills && cp -r skills-src/tutorials/pi-coding-agent-guide/resources/04-skills/code-review .agents/skills/code-review && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "code-review" agent skill from https://github.com/owainlewis/youtube-tutorials/tree/main/tutorials/pi-coding-agent-guide/resources/04-skills/code-review into .agents/skills/code-review/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-review", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add owainlewis/youtube-tutorials --skill code-review -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install owainlewis/youtube-tutorials code-review --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/owainlewis/youtube-tutorials.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/tutorials/pi-coding-agent-guide/resources/04-skills/code-review .cursor/skills/code-review && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "code-review" agent skill from https://github.com/owainlewis/youtube-tutorials/tree/main/tutorials/pi-coding-agent-guide/resources/04-skills/code-review into .cursor/skills/code-review/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-review", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/owainlewis/youtube-tutorials.git --path tutorials/pi-coding-agent-guide/resources/04-skills/code-review--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add owainlewis/youtube-tutorials --skill code-review -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install owainlewis/youtube-tutorials code-review --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/owainlewis/youtube-tutorials.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/tutorials/pi-coding-agent-guide/resources/04-skills/code-review .gemini/skills/code-review && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "code-review" agent skill from https://github.com/owainlewis/youtube-tutorials/tree/main/tutorials/pi-coding-agent-guide/resources/04-skills/code-review into .gemini/skills/code-review/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-review", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install owainlewis/youtube-tutorials code-reviewInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add owainlewis/youtube-tutorials --skill code-review -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/owainlewis/youtube-tutorials.git skills-src && mkdir -p .github/skills && cp -r skills-src/tutorials/pi-coding-agent-guide/resources/04-skills/code-review .github/skills/code-review && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "code-review" agent skill from https://github.com/owainlewis/youtube-tutorials/tree/main/tutorials/pi-coding-agent-guide/resources/04-skills/code-review into .github/skills/code-review/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-review", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add owainlewis/youtube-tutorials --skill code-review -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install owainlewis/youtube-tutorials code-review --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/owainlewis/youtube-tutorials.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/tutorials/pi-coding-agent-guide/resources/04-skills/code-review .opencode/skills/code-review && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "code-review" agent skill from https://github.com/owainlewis/youtube-tutorials/tree/main/tutorials/pi-coding-agent-guide/resources/04-skills/code-review into .opencode/skills/code-review/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "code-review", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
code-review- GitHub stars
- 402
- Token cost
- ~343 tokens
- SKILL.md length
- 160 words
- Files
- 1
- Skills in repo
- 3
- Repo updated
- First seen
- Licence
- MIT
At a glance
Review code changes for bugs, security issues, performance problems, and style violations.
- Works in 3 steps: Understand the Change → Check for Issues → Report
- Asked to review code
- SKILL.md covers Step 1: Understand the Change, Step 2: Check for Issues and Step 3: Report
- Calls git
What it does
Code Review is an agent skill from owainlewis/youtube-tutorials. Review code changes for bugs, security issues, performance problems, and style violations. Use when asked to review code, a PR, or recent changes.
Its SKILL.md is about 340 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Development, covering Code review. It works with Python. The repository describes itself as: All my YouTube tutorials. Everything here is free - but please follow me on YouTube if you find these helpful. The licence is MIT.
When your agent uses it
- Asked to review code
- Tasks that involve Code review
Example prompts
- “/code-review”
Workflow steps
3 steps, taken from the step headings in SKILL.md.
What it can do on your machine
Read from SKILL.md and the folder at commit 5b3d3c9. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Shell commands in SKILL.md call:
git
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use git, which can reach the network depending on how they are called.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Code Review loads about 343 tokens when it runs. Until then it costs about 40 tokens; SKILL.md has 160 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from owainlewis/youtube-tutorials at commit 5b3d3c9, republished under its MIT licence (© owainlewis). 160 words, ~343 tokens.
Download SKILL.mdSave it as
.claude/skills/code-review/SKILL.md (or your agent's skills folder).- name
- code-review
- description
- Review code changes for bugs, security issues, performance problems, and style violations. Use when asked to review code, a PR, or recent changes.
Code Review
When reviewing code, follow this process:
Step 1: Understand the Change
Run git diff (or git diff --staged for staged changes) to see what changed.
Read the modified files in full to understand the surrounding context.
Step 2: Check for Issues
Review each changed file for:
Correctness
- Logic errors, off-by-one errors, race conditions
- Missing null/undefined checks at system boundaries
- Incorrect error handling (swallowed errors, wrong error types)
Security
- SQL injection, XSS, command injection
- Hardcoded secrets or credentials
- Overly permissive file/network access
Performance
- N+1 queries, unnecessary loops, large allocations
- Missing indexes for new database queries
- Blocking operations in async code
Maintainability
- Unclear naming, overly complex logic
- Dead code, unused imports
- Missing types in TypeScript
Step 3: Report
Format your review as:
- Summary: One sentence on what the change does
- Issues: Specific problems with file paths and line numbers
- Suggestions: Optional improvements (clearly marked as optional)
Be direct. Don't pad with praise. Focus on things that matter.
© owainlewis, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in tutorials/pi-coding-agent-guide/resources/04-skills/code-review of owainlewis/youtube-tutorials.
Open the folder on GitHubat commit 5b3d3c9
Compare with similar skills
Code Review next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Code Review this skillowainlewis/youtube-tutorials | 402 | — | ~343 | Automated safety check: Pass | MIT | |
| Code Review ChecklistshareAI-lab/learn-claude-code | 78k | 5 repos | ~1.1k | Automated safety check: Pass | MIT | |
| Dignified Python Standardsdocling-project/docling | 69k | — | ~1.5k | Automated safety check: Pass | Apache-2.0 | |
| Code Review Skillawesome-skills/code-review-skill | 2.1k | — | ~2.8k | Automated safety check: Notes | MIT | |
| Docling Pull Request Reviewdocling-project/docling | 69k | — | ~1k | Automated safety check: Pass | MIT | |
| Git History Bug Auditben-manes/caffeine | 18k | — | ~3.3k | Automated safety check: Pass | Apache-2.0 |
Similar skills
Dignified Python Standards
docling-project/docling
Applies opinionated production Python conventions chosen by the project's Python version: modern type syntax, pathlib, explicit checks and interface guidance.
Code Review Skill
awesome-skills/code-review-skill
Provides comprehensive code review guidance for React 19, Vue 3, Angular 17+, Svelte 5, Rust, TypeScript, Java, Java 8, PHP, Ruby, Rails, Python, Django, FastAPI, Go, C/.NET, Kotlin, Swift, Dart…
Docling Pull Request Review
docling-project/docling
Reviews or re-reviews a Docling pull request in fixed stages, with findings that can be reproduced and an explicit record of every check that was run.
Git History Bug Audit
ben-manes/caffeine
Audits a module by walking its git history commit by commit, tracking unresolved issues forward, and reporting the ones that survive to HEAD as findings.
Code Reviewer
jewbetcha/opentrace
Comprehensive code review skill for TypeScript, JavaScript, Python, Swift, Kotlin, Go.
More from owainlewis/youtube-tutorials
Related
Works with
Categories
Questions about Code Review
What does Code Review do?
Review code changes for bugs, security issues, performance problems, and style violations. Code Review is an agent skill from owainlewis/youtube-tutorials. Review code changes for bugs, security issues, performance problems, and style violations.
When should I use Code Review?
Code Review fits situations like: asked to review code; tasks that involve Code review.
How do I install Code Review in Claude Code?
Run `npx skills add owainlewis/youtube-tutorials --skill code-review -a claude-code`. Or copy the skill folder (tutorials/pi-coding-agent-guide/resources/04-skills/code-review in owainlewis/youtube-tutorials) into .claude/skills/code-review in your project. Claude Code loads it when a task matches its description.
How do I install Code Review in Codex?
Run `npx skills add owainlewis/youtube-tutorials --skill code-review -a codex`. Or copy the skill folder (tutorials/pi-coding-agent-guide/resources/04-skills/code-review in owainlewis/youtube-tutorials) into .agents/skills/code-review in your project. Codex loads it when a task matches its description.
Can I use Code Review in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add owainlewis/youtube-tutorials --skill code-review -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/code-review, .gemini/skills/code-review, .github/skills/code-review and .opencode/skills/code-review in your project.
What does Code Review need to run?
Going by SKILL.md and its folder, Code Review needs the command-line tools its instructions call (git).
Does Code Review access the network?
SKILL.md contains no URLs. Its commands use git, which can reach the network depending on how they are called. This is read from the text; nothing was executed.
Is Code Review safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Code Review use?
Code Review is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Code Review use?
About 343 tokens (SKILL.md is roughly 1.4k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Code Review?
Skills that share tags, products or a category with Code Review: Code Review Checklist (shareAI-lab/learn-claude-code, 78k stars), Dignified Python Standards (docling-project/docling, 69k stars), Code Review Skill (awesome-skills/code-review-skill, 2.1k stars) and Docling Pull Request Review (docling-project/docling, 69k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Code Review?
owainlewis (a GitHub user) maintains it in owainlewis/youtube-tutorials, which has 402 GitHub stars. The repository holds 3 skills in this directory. The repository was last updated on September 27, 2026.
Source: owainlewis/youtube-tutorials on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.