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Agent skill

Code Reviewer

by vigolium in vigolium/piolium

A skill your agent uses to review code. An agent skill from vigolium/piolium.

MITAuto-check passedDevelopment

Install Code Reviewer

skills CLI
$ npx skills add vigolium/piolium --skill code-reviewer -a claude-code

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

GitHub CLI
$ gh skill install vigolium/piolium code-reviewer --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/vigolium/piolium.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/code-reviewer .claude/skills/code-reviewer && 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/

Facts

Skill name
code-reviewer
GitHub stars
140
Used in
1 other repo
Token cost
~796 tokens
SKILL.md length
390 words
Files
1
Skills in repo
4
Repo updated
First seen
Licence
MIT

At a glance

A skill your agent uses to review code. An agent skill from vigolium/piolium.

  • Works in 5 steps: Determine Review Target → Preparation → In-Depth Analysis → …
  • Tasks that involve Code review
  • Calls git and npm
  • Tasks that involve Pull requests

What it does

Code Reviewer is an agent skill from vigolium/piolium. Use this skill to review code. It supports both local changes (staged or working tree) and remote Pull Requests (by ID or URL). It focuses on correctness, maintainability, and adherence to project standards.

Its SKILL.md is about 800 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 and Pull requests. It works with Git. The repository describes itself as: A Pi-native extension for thorough, agentic security audits. The licence is MIT.

When your agent uses it

  • Tasks that involve Code review
  • Tasks that involve Pull requests

Example prompts

  • “/code-reviewer”

Workflow steps

5 steps, taken from the step headings in SKILL.md.

  1. Determine Review Target
  2. Preparation
  3. In-Depth Analysis
  4. Provide Feedback
  5. Cleanup (Remote PRs only)

What it can do on your machine

Read from SKILL.md and the folder at commit 9ffdcac. 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
    • npm

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md. Its commands use git and npm, 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 Reviewer loads about 796 tokens when it runs. Until then it costs about 55 tokens; SKILL.md has 390 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
~796

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 vigolium/piolium at commit 9ffdcac, republished under its MIT licence (© vigolium). 390 words, ~796 tokens.

Download SKILL.mdSave it as .claude/skills/code-reviewer/SKILL.md (or your agent's skills folder).
name
code-reviewer
description
Use this skill to review code. It supports both local changes (staged or working tree) and remote Pull Requests (by ID or URL). It focuses on correctness, maintainability, and adherence to project standards.

Code Reviewer

This skill guides the agent in conducting professional and thorough code reviews for both local development and remote Pull Requests.

Workflow

1. Determine Review Target
  • Remote PR: If the user provides a PR number or URL (e.g., "Review PR #123"), target that remote PR.
  • Local Changes: If no specific PR is mentioned, or if the user asks to "review my changes", target the current local file system states (staged and unstaged changes).
2. Preparation
For Remote PRs:
  1. Checkout: Use the GitHub CLI to checkout the PR.
    bash
    gh pr checkout <PR_NUMBER>
  2. Preflight: Execute the project's standard verification suite to catch automated failures early.
    bash
    npm run preflight
  3. Context: Read the PR description and any existing comments to understand the goal and history.
For Local Changes:
  1. Identify Changes:
    • Check status: git status
    • Read diffs: git diff (working tree) and/or git diff --staged (staged).
  2. Preflight (Optional): If the changes are substantial, ask the user if they want to run npm run preflight before reviewing.
3. In-Depth Analysis

Analyze the code changes based on the following pillars:

  • Correctness: Does the code achieve its stated purpose without bugs or logical errors?
  • Maintainability: Is the code clean, well-structured, and easy to understand and modify in the future? Consider factors like code clarity, modularity, and adherence to established design patterns.
  • Readability: Is the code well-commented (where necessary) and consistently formatted according to our project's coding style guidelines?
  • Efficiency: Are there any obvious performance bottlenecks or resource inefficiencies introduced by the changes?
  • Security: Are there any potential security vulnerabilities or insecure coding practices?
  • Edge Cases and Error Handling: Does the code appropriately handle edge cases and potential errors?
  • Testability: Is the new or modified code adequately covered by tests (even if preflight checks pass)? Suggest additional test cases that would improve coverage or robustness.
Show full SKILL.md (86 more words)Show less
4. Provide Feedback
Structure
  • Summary: A high-level overview of the review.
  • Findings:
    • Critical: Bugs, security issues, or breaking changes.
    • Improvements: Suggestions for better code quality or performance.
    • Nitpicks: Formatting or minor style issues (optional).
  • Conclusion: Clear recommendation (Approved / Request Changes).
Tone
  • Be constructive, professional, and friendly.
  • Explain why a change is requested.
  • For approvals, acknowledge the specific value of the contribution.
5. Cleanup (Remote PRs only)
  • After the review, ask the user if they want to switch back to the default branch (e.g., main or master).

© vigolium, 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 skills/code-reviewer of vigolium/piolium.

Open the folder on GitHubat commit 9ffdcac

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in vigolium/piolium, which our catalogue first saw on October 7, 2026.

Compare with similar skills

Code Reviewer 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 Reviewer compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Code Reviewer this skillvigolium/piolium1401 repos~796Automated safety check: PassMIT
Understand Diff AnalysisEgonex-AI/Understand-Anything86k1 repos~1.4kAutomated safety check: PassMIT
Open Code Review CLIalibaba/open-code-review44k—~3.1kAutomated safety check: PassApache-2.0
Code Reviewflutter/flutter179k—~1.4kAutomated safety check: PassBSD-3-Clause
PR Review State Fetchprisma/orm48k—~767Automated safety check: PassApache-2.0
Knowledge Graph PR Reviewtirth8205/code-review-graph32k—~452Automated safety check: PassMIT

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Works with

Categories

Questions about Code Reviewer

What does Code Reviewer do?

A skill your agent uses to review code. An agent skill from vigolium/piolium. Code Reviewer is an agent skill from vigolium/piolium. Use this skill to review code.

When should I use Code Reviewer?

Code Reviewer fits situations like: tasks that involve Code review; tasks that involve Pull requests.

How do I install Code Reviewer in Claude Code?

Run `npx skills add vigolium/piolium --skill code-reviewer -a claude-code`. Or copy the skill folder (skills/code-reviewer in vigolium/piolium) into .claude/skills/code-reviewer in your project. Claude Code loads it when a task matches its description.

How do I install Code Reviewer in Codex?

Run `npx skills add vigolium/piolium --skill code-reviewer -a codex`. Or copy the skill folder (skills/code-reviewer in vigolium/piolium) into .agents/skills/code-reviewer in your project. Codex loads it when a task matches its description.

Can I use Code Reviewer 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 vigolium/piolium --skill code-reviewer -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-reviewer, .gemini/skills/code-reviewer, .github/skills/code-reviewer and .opencode/skills/code-reviewer in your project.

What does Code Reviewer need to run?

Going by SKILL.md and its folder, Code Reviewer needs the command-line tools its instructions call (git and npm).

Does Code Reviewer access the network?

SKILL.md contains no URLs. Its commands use git and npm, which can reach the network depending on how they are called. This is read from the text; nothing was executed.

Is Code Reviewer 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 Reviewer use?

Code Reviewer 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 Reviewer use?

About 796 tokens (SKILL.md is roughly 3.2k 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 Reviewer?

Skills that share tags, products or a category with Code Reviewer: Understand Diff Analysis (Egonex-AI/Understand-Anything, 86k stars), Open Code Review CLI (alibaba/open-code-review, 44k stars), Code Review (flutter/flutter, 179k stars) and PR Review State Fetch (prisma/orm, 48k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Code Reviewer?

vigolium (a GitHub organization) maintains it in vigolium/piolium, which has 140 GitHub stars. The repository holds 4 skills in this directory. The repository was last updated on September 20, 2026.

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