Agent skill

Code Review

Review code for quality, security, performance, and maintainability.

MITAuto-check passedDevelopment

Install Code Review

skills CLI

$ npx skills add espennilsen/pi --skill code-review -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI

$ gh skill install espennilsen/pi code-review --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy

$ git clone --depth 1 https://github.com/espennilsen/pi.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/code-review .claude/skills/code-review && rm -rf skills-src

Use ~/.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/

Paste into Claude Code

Install the "code-review" agent skill from https://github.com/espennilsen/pi/tree/main/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

$skill-installer install https://github.com/espennilsen/pi/tree/main/skills/code-review

Type 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.

skills CLI

$ npx skills add espennilsen/pi --skill code-review -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install espennilsen/pi code-review --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/espennilsen/pi.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/code-review .agents/skills/code-review && rm -rf skills-src

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "code-review" agent skill from https://github.com/espennilsen/pi/tree/main/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.

skills CLI

$ npx skills add espennilsen/pi --skill code-review -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install espennilsen/pi code-review --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/espennilsen/pi.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/code-review .cursor/skills/code-review && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "code-review" agent skill from https://github.com/espennilsen/pi/tree/main/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

$ gemini skills install https://github.com/espennilsen/pi.git --path 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.

skills CLI

$ npx skills add espennilsen/pi --skill code-review -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install espennilsen/pi code-review --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/espennilsen/pi.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/code-review .gemini/skills/code-review && rm -rf skills-src

Use ~/.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/

Paste into Gemini CLI

Install the "code-review" agent skill from https://github.com/espennilsen/pi/tree/main/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.

GitHub CLI

$ gh skill install espennilsen/pi code-review

Installs 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).

skills CLI

$ npx skills add espennilsen/pi --skill code-review -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

$ git clone --depth 1 https://github.com/espennilsen/pi.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/code-review .github/skills/code-review && rm -rf skills-src

Use ~/.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/

Paste into GitHub Copilot

Install the "code-review" agent skill from https://github.com/espennilsen/pi/tree/main/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.

skills CLI

$ npx skills add espennilsen/pi --skill code-review -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install espennilsen/pi code-review --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/espennilsen/pi.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/code-review .opencode/skills/code-review && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "code-review" agent skill from https://github.com/espennilsen/pi/tree/main/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: 122
Token cost: ~771 tokens
SKILL.md length: 279 words
Files: 1
Skills in repo: 36
Repo updated: Sep 21, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Review code for quality, security, performance, and maintainability.

Works in 4 steps: Understand scope — Read the changed… → Read the code — Use the read tool on… → Analyze against checklist — Score each… → …
Auditing a codebase
SKILL.md covers Process, Review Checklist, Output Format and Common Patterns in Espen's Stack
Calls git

What it does

Code Review is an agent skill from espennilsen/pi. Review code for quality, security, performance, and maintainability. Use when reviewing PRs, auditing a codebase, or refactoring. Covers TypeScript, Node.js, infrastructure-as-code, and full-stack web apps.

Its SKILL.md is about 770 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, Infrastructure as code and Refactoring. It works with TypeScript and Node.js. The licence is MIT.

When your agent uses it

Auditing a codebase
Tasks that involve Code review
Tasks that involve Infrastructure as code

Example prompts

“/code-review”

Requirements

Node.js
Docker

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

Understand scope — Read the changed files or the area under review
Read the code — Use the read tool on each file. Don't guess.
Analyze against checklist — Score each category.
Report — Use the output format below.

What it can do on your machine

Read from SKILL.md and the folder at commit 79d019b. 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 771 tokens when it runs. Until then it costs about 55 tokens; SKILL.md has 279 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~55
When it runs · the whole SKILL.md, loaded when a task matches: ~771

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 espennilsen/pi at commit 79d019b, republished under its MIT licence (© espennilsen). 279 words, ~771 tokens.

Download SKILL.mdSave it as .claude/skills/code-review/SKILL.md (or your agent's skills folder).

name: code-review
description: Review code for quality, security, performance, and maintainability. Use when reviewing PRs, auditing a codebase, or refactoring. Covers TypeScript, Node.js, infrastructure-as-code, and full-stack web apps.

Code Review

Systematic code review for Espen's TypeScript/Node.js projects.

Process

Understand scope — Read the changed files or the area under review:

bash

# For git changes
git diff --name-only HEAD~1
git diff HEAD~1

# For a specific area
find src/ -name "*.ts" -newer <reference-file>

Read the code — Use the read tool on each file. Don't guess.
Analyze against checklist — Score each category.
Report — Use the output format below.

Review Checklist

Correctness

Logic handles edge cases (null, empty, boundary values)
Error handling is explicit (no swallowed errors, no bare catch {})
Async code handles rejection/cancellation properly
Types are accurate (no unnecessary any, proper narrowing)

Security

No secrets or credentials in code
User input is validated/sanitized before use
SQL queries use parameterized statements (no string interpolation)
File paths are resolved safely (no path traversal)
Auth checks are present where needed

Performance

No N+1 queries or unbounded loops over large datasets
Heavy operations are async or streamed (not blocking)
Database queries use appropriate indexes
Large responses are paginated or truncated

Maintainability

Functions do one thing with clear names
No magic numbers or hardcoded values that should be config
Types and interfaces are defined (not inline object shapes)
Dead code and unused imports are removed
Comments explain why, not what

Project Conventions

Follows existing patterns in the codebase
File naming and directory structure is consistent
Error messages are helpful for debugging
Logging is appropriate (not too noisy, not silent on errors)

Output Format

markdown

## Code Review: [scope]

### Summary
One paragraph: what the code does, overall quality assessment.

### Issues

#### 🔴 Critical
- [file:line] Description and fix

#### 🟡 Important
- [file:line] Description and suggestion

#### 🔵 Minor
- [file:line] Nit or style suggestion

### What's Good
- Call out well-written code, good patterns, clever solutions

### Recommendations
- Prioritized list of changes, starting with most impactful

Common Patterns in Espen's Stack

Project Type	Key Things to Check
Pi extensions	Tool parameter schemas, error returns, signal/abort handling
Eleventy sites	Template data flow, permalink structure, Tailwind purge config
TanStack apps	Router setup, query keys, optimistic updates, Clerk auth guards
Infrastructure	Terraform state safety, Docker layer caching, env var handling
SQLite	Migration ordering, prepared statements, WAL mode, index coverage

Files

Just SKILL.md in skills/code-review of espennilsen/pi.

Open the folder on GitHubat commit 79d019b

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.

Code Review compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Code Review this skillespennilsen/pi	122	—	~771	Automated safety check: Pass	MIT	16 days ago
ast-grep Codemod Referencewarp-drive-data/warp-drive	3.2k	—	~2.6k	Automated safety check: Pass	MIT	yesterday
Coding Agentmastra-ai/mastra	29k	—	~2.3k	Automated safety check: Pass	Custom licence	today
Typescript React ReviewerSuFxGIT/scoutarr	114	—	~1.7k	Automated safety check: Pass	None	6 mo ago
Swpm Code Reviewdeinsoftware/swpm	125	—	~1.1k	Automated safety check: Pass	MIT	4 mo ago
Chat Gun Bff ContractHsienW/chat-gun	143	—	~2.6k	Automated safety check: Pass	Custom licence	3 days ago

Similar skills

ast-grep Codemod Reference
warp-drive-data/warp-drive
Reference for writing and debugging TypeScript and JavaScript codemods with @ast-grep/napi: parsing, node queries, meta-variables, rule objects and editing.
3.2k GitHub stars~2.6k tokensUpdated yesterday
DevelopmentAuto-check passed
Coding Agent
mastra-ai/mastra
Authoring playbook for building agents that write, edit, review, or refactor code.
29k GitHub stars~2.3k tokensUpdated today
DevelopmentAuto-check passed
Typescript React Reviewer
SuFxGIT/scoutarr
Expert code reviewer for TypeScript + React 19 applications.
114 GitHub stars~1.7k tokensUpdated 6 mo ago
DevelopmentAuto-check passed
Swpm Code Review
deinsoftware/swpm
Automated code review bash script for SWPM. An agent skill from deinsoftware/swpm.
125 GitHub stars~1.1k tokensUpdated 4 mo ago
DevelopmentAuto-check passed
Chat Gun Bff Contract
HsienW/chat-gun
Apply when creating, modifying, refactoring, debugging, testing, or reviewing TypeScript and Node.js code under bff/ in chat-gun.
143 GitHub stars~2.6k tokensUpdated 3 days ago
DevelopmentAuto-check passed
Code Reviewer
LeoYeAI/openclaw-master-skills
Code review automation for TypeScript, JavaScript, Python, Go, Swift, Kotlin.
2.2k GitHub starsUsed in 1 repo~1.2k tokens
DevelopmentAuto-check passed

Questions about Code Review

What does Code Review do?

Review code for quality, security, performance, and maintainability. Code Review is an agent skill from espennilsen/pi. Review code for quality, security, performance, and maintainability.

When should I use Code Review?

Code Review fits situations like: auditing a codebase; tasks that involve Code review; tasks that involve Infrastructure as code.

How do I install Code Review in Claude Code?

Run `npx skills add espennilsen/pi --skill code-review -a claude-code`. Or copy the skill folder (skills/code-review in espennilsen/pi) 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 espennilsen/pi --skill code-review -a codex`. Or copy the skill folder (skills/code-review in espennilsen/pi) 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 espennilsen/pi --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). Our summary lists: Node.js; Docker.

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 771 tokens (SKILL.md is roughly 3.1k 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: ast-grep Codemod Reference (warp-drive-data/warp-drive, 3.2k stars), Coding Agent (mastra-ai/mastra, 29k stars), Typescript React Reviewer (SuFxGIT/scoutarr, 114 stars) and Swpm Code Review (deinsoftware/swpm, 125 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Code Review?

espennilsen (a GitHub user) maintains it in espennilsen/pi, which has 122 GitHub stars. The repository holds 36 skills in this directory. The repository was last updated on September 21, 2026.

Source: espennilsen/pi on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Install Code Review

Facts

At a glance

What it does

When your agent uses it

Example prompts

Requirements

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Code Review

Process

Review Checklist

Correctness

Security

Performance

Maintainability

Project Conventions

Output Format

Common Patterns in Espen's Stack

Files

Compare with similar skills

Similar skills

More from espennilsen/pi

Related

Questions about Code Review