code-reviewer

A set of instructions for reviewing code for bugs, security vulnerabilities, performance problems, and best-practice issues. It also describes checking project context, conventions, and dependencies.

In plain words
What is it for?
Use it for code reviews, pull requests, security audits, bug checks, and quality reviews. It applies checks such as OWASP security review, performance analysis, and dependency-risk assessment.
Why use it?
It gives an agent a structured way to inspect changed or selected files instead of making vague comments. It helps surface problems such as injection flaws, missing validation, race conditions, and inefficient queries.

Skill for Claude CodeCodex

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

Made for: Claude Code, Codex.

Per session 70 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 563 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 $0.00070 $0.00563
Opus 5 $0.00035 $0.00282
Sonnet 5 $0.00014 $0.00113
Haiku 4.5 $0.00007 $0.00056

Measured 2d ago against content hash c74f4b1a675a, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, 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 2d ago.

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.

plugins/code-reviewer/skills/code-reviewer/SKILL.md · 91 lines

How it starts

The opening of the file, as written. The whole thing — 91 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Code Reviewer

AI-powered code review that analyzes code for bugs, security vulnerabilities, performance issues, and adherence to best practices.

Capabilities

  • Bug detection and logical error analysis
  • Security vulnerability scanning (OWASP Top 10)
  • Performance issue identification
  • Best practice and style suggestions
  • Dependency risk assessment

Instructions

When the user asks for a code review:

1. Gather Context

  • Identify the files to review (user may specify, or review staged/changed files via git diff)
  • Determine the language and framework
  • Check for project conventions (linting config, .editorconfig, etc.)

2. Analyze for Issues

Review each file systematically for:

Bugs & Logic Errors:

  • Off-by-one errors, null/undefined access, race conditions
  • Incorrect type handling, missing error cases
  • Logic that doesn't match stated intent

Security (OWASP Top 10):

  • SQL injection, XSS, command injection
  • Hardcoded secrets or credentials
  • Insecure deserialization, SSRF
  • Missing input validation at system boundaries
  • Improper authentication/authorization checks

Performance:

  • N+1 queries, unnecessary re-renders
  • Missing indexes for database queries
  • Unbounded loops or memory leaks
  • Synchronous operations that should be async

Best Practices:

  • Dead code, unused variables/imports
  • Missing error handling at API boundaries
  • Inconsistent naming conventions
  • Functions doing too many things

3. Report Findings

Format the review as:

## Code Review Summary

### Critical Issues (must fix)
- [FILE:LINE] Description of critical bug or security issue

### Warnings (should fix)
- [FILE:LINE] Description of potential problem

### Suggestions (nice to have)
- [FILE:LINE] Style or best practice improvement

### What Looks Good
- Positive observations about well-written code

4. Offer Fixes

For each critical issue and warning, offer to generate a fix. Use the Edit tool to apply fixes the user approves.

Example

Read the full file on GitHub · 91 lines

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. 2d ago First seen · 91 lines · 70 tokens per session scan A c74f4b1a675a

Subscribe to this mod's changes

code-reviewer is a skill published in the GitHub repository techgangboss/agentstore (4 stars, last pushed 6mo ago), licensed MIT. It adds 70 tokens to every session and 563 once invoked, about $0.0003 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 2026-08-31.

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