code-reviewer

code-reviewer is a skill for Claude Code from zhaono1/agent-playbook. It costs 35 tokens per session (1,446 once invoked), scanned A, original, MIT.

A review guide for checking pull requests and code changes. A pull request is a proposed change that someone wants to add to a shared codebase.

In plain words
What is it for?
Use it to review diffs, check project conventions, and examine correctness, security, performance, and error handling.
Why use it?
It helps find bugs, security problems, maintenance issues, and inefficient code before changes are accepted.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add skills/zhaono1/agent-playbook/code-reviewer
Any agent
npx skills add zhaono1/agent-playbook --skill code-reviewer
Clone the repo
git clone --depth 1 https://github.com/zhaono1/agent-playbook

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for code-reviewer

README.md
[![agentmods](https://agentmods.dev/badge/skills/zhaono1/agent-playbook/code-reviewer.svg)](https://agentmods.dev/skills/zhaono1/agent-playbook/code-reviewer)
Your own site
<a href="https://agentmods.dev/skills/zhaono1/agent-playbook/code-reviewer"><img src="https://agentmods.dev/badge/skills/zhaono1/agent-playbook/code-reviewer.svg" alt="Measured on agentmods" height="20"></a>
Per session 35 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,446 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00035 $0.01446
Opus 5 $0.00017 $0.00723
Sonnet 5 $0.00007 $0.00289
Haiku 4.5 $0.00003 $0.00145

Measured 6d ago against content hash 9fd3bcca5a37, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

code-reviewer scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 6d ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/review_checklist.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

skills/code-reviewer/SKILL.md · 230 lines

How it starts

The opening of the file, as written. The whole thing — 230 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Code Reviewer

A comprehensive code review skill that analyzes pull requests and code changes for quality, security, maintainability, and best practices.

When This Skill Activates

This skill activates when you:

  • Ask for a code review
  • Request a PR review
  • Mention reviewing changes
  • Say "review this" or "check this code"

Review Process

Phase 1: Context Gathering

  1. Get changed files

    git diff main...HEAD --name-only
    git log main...HEAD --oneline
    
  2. Get the diff

    git diff main...HEAD
    
  3. Understand project context

    • Read relevant documentation
    • Check existing patterns in similar files
    • Identify project-specific conventions

Phase 2: Analysis Categories

1. Correctness
  • Logic is sound and matches requirements
  • Edge cases are handled
  • Error handling is appropriate
  • No obvious bugs or typos
2. Security
  • No hardcoded secrets or credentials
  • Input validation and sanitization
  • SQL injection prevention
  • XSS prevention (for frontend)
  • Authentication/authorization checks
  • Safe handling of user data
3. Performance
  • No N+1 queries
  • Appropriate caching
  • Efficient algorithms
  • No unnecessary computations
  • Memory efficiency
4. Code Quality
  • Follows DRY principle
  • Follows KISS principle
  • Appropriate abstractions
  • Clear naming conventions
  • Proper typing (if TypeScript)
  • No commented-out code
5. Testing
  • Tests cover new functionality
  • Tests cover edge cases
  • Test assertions are meaningful
  • No brittle tests
6. Documentation
  • Complex logic is explained
  • Public APIs have documentation
  • JSDoc/TSDoc for functions
  • README updated if needed
7. Maintainability
  • Code is readable
  • Consistent style
  • Modular design
  • Separation of concerns

Phase 3: Output Format

Use this structured format for review feedback:

Read the full file on GitHub · 230 lines

Files

What ships with it

5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 6d ago First seen · 230 lines · 35 tokens per session scan A 9fd3bcca5a37

Subscribe to this mod's changes

code-reviewer is a skill published in the GitHub repository zhaono1/agent-playbook (77 stars, last pushed 11d ago), licensed MIT. It adds 35 tokens to every session and 1,446 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.