oh-my-codex: Skill for Codex

.codex/skills/code-review/SKILL.md

code-review is a skill for Codex from junghwaYang/oh-my-codex. It costs 0 tokens per session (566 once invoked), scanned A, original, MIT.

A structured review of code for security risks, speed, correctness, and ease of maintenance before or after changes are made.

In plain words
What is it for?
Use it before merging changes, after building features, during security checks, or when improving performance and code quality.
Why use it?
It helps find vulnerabilities, bugs, slow operations, and hard-to-maintain code before they cause problems.

Skill for Codex

Written for Codex: installed under .codex/.

This is junghwaYang/oh-my-codex's own configuration. It tells Codex how to work on oh-my-codex itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything oh-my-codex configures →

Reuse

Borrowing it

Nothing to install: this file belongs to junghwaYang/oh-my-codex. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/junghwaYang/oh-my-codex/main/.codex/skills/code-review/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/junghwaYang/oh-my-codex

Made for: Codex.

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-review

README.md
[![agentmods](https://agentmods.dev/badge/skills/junghwayang/oh-my-codex/code-review/github.svg)](https://agentmods.dev/skills/junghwayang/oh-my-codex/code-review)
Your own site
<a href="https://agentmods.dev/skills/junghwayang/oh-my-codex/code-review"><img src="https://agentmods.dev/badge/skills/junghwayang/oh-my-codex/code-review/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for code-review

Your own site · 80×15
<a href="https://agentmods.dev/skills/junghwayang/oh-my-codex/code-review"><img src="https://agentmods.dev/badge/skills/junghwayang/oh-my-codex/code-review.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 0 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 566 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 $0.00000 $0.00566
Opus 5.5 $0.00000 $0.00226
Sonnet 5.5 $0.00000 $0.00113
Haiku 4.5 $0.00000 $0.00057

Measured 2mo ago against content hash dc5104c90040, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

code-review 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 2mo 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.

.codex/skills/code-review/SKILL.md · 120 lines

How it starts

The opening of the file, as written. The whole thing — 120 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Code Review Skill

Comprehensive code review with security, performance, and quality checks.

When to Use

  • Before merging PRs
  • After completing features
  • Security audits
  • Performance optimization
  • Code quality improvement

Review Categories

Category Prefix Priority Focus
Security SEC- CRITICAL Vulnerabilities, auth, data exposure
Performance PERF- HIGH Speed, memory, scalability
Correctness BUG- HIGH Logic errors, edge cases
Maintainability MAINT- MEDIUM Readability, complexity
Style STYLE- LOW Formatting, naming

Review Process

1. Security Review (SEC-)

□ No hardcoded secrets
□ Input validation present
□ SQL injection prevention
□ XSS protection
□ CSRF protection
□ Authentication checks
□ Authorization checks
□ Sensitive data handling
□ Secure dependencies

2. Performance Review (PERF-)

□ No N+1 queries
□ Proper indexing
□ Efficient algorithms (O notation)
□ Memory management
□ Caching strategy
□ Bundle size (frontend)
□ Lazy loading
□ Database query optimization

3. Correctness Review (BUG-)

□ Logic is sound
□ Edge cases handled
□ Null/undefined checks
□ Error handling
□ Race conditions
□ State management
□ Type safety

4. Maintainability Review (MAINT-)

□ Single responsibility
□ DRY principle
□ Clear naming
□ Appropriate comments
□ Reasonable complexity
□ Test coverage
□ Documentation

Output Format

## Code Review: {scope}

### Summary
{1-2 sentence assessment}

### Critical Issues
- **SEC-001**: {issue}
  - File: {path}:{line}
  - Risk: {description}
  - Fix: {suggestion}

### High Priority
- **PERF-001**: {issue}
  - File: {path}:{line}
  - Impact: {description}
  - Fix: {suggestion}

### Medium Priority
- **MAINT-001**: {issue}
  - Suggestion: {improvement}

### Low Priority
- **STYLE-001**: {issue}

### Positive Notes
- {good practice observed}

### Verdict
[ ] ✅ Approve
[ ] ⚠️ Approve with comments
[ ] ❌ Request changes

Read the full file on GitHub · 120 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. 2mo ago First seen · 120 lines · 0 tokens per session scan A dc5104c90040

Subscribe to this mod's changes

code-review is a skill published in the GitHub repository junghwaYang/oh-my-codex (5 stars, last pushed 8mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 566 tokens. 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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