codex

Analyze code diffs and project plans for independent review.

1|3|Updated Mar 19, 2026

Search Tags:#cli #codex #developer-tools #code-review #software-engineering #adversarial #ai-tools

Ready to run

npx skills add https://github.com/ekrishgupta/gemstack --skill codex-ekrishgupta

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: codex
Source: https://github.com/ekrishgupta/gemstack/tree/main/codex
Command: npx skills add https://github.com/ekrishgupta/gemstack --skill codex-ekrishgupta

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Codex provides an independent, precise second opinion on code changes by analyzing diffs and proposed plans, helping teams spot issues before merging.

Core Features & Use Cases

Independent review: runs a second Codex analysis on diffs or plans to surface edge cases and potential weaknesses.
Adversarial challenge mode: pushes changes to find failure modes, security gaps, or logic errors.
Consult mode with session continuity: allows asking Codex questions about the project with persistent context for follow-ups.
Use cases include security reviews, code quality gates, design critique, and plan verification for complex features.

Quick Start

Ask /codex to review the current diff or project plan to receive an independent, brutally honest assessment.

Frequently Asked Questions about codex

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I get a brutally honest second opinion on my code diffs?▼

An adversarial code review tool analyzes your diffs and project plans to surface edge cases, security gaps, and logic errors. It provides a brutally honest second opinion by challenging proposed changes before merging.

What is adversarial code review and how does it find failure modes?▼

Adversarial code review actively challenges your changes to find failure modes, security gaps, or logic errors. It pushes against your diff or project plan to expose weaknesses that standard reviews might miss before merging.

Can I ask follow-up questions about my project after an initial code review?▼

Yes, you can ask follow-up questions about your project using a consult mode that supports session continuity. This maintains persistent context across multiple queries, allowing for iterative design critiques and plan verification.

Does this code review tool work for security reviews and design critiques?▼

Yes, the tool works for security reviews, code quality gates, design critiques, and plan verification. It analyzes diffs and proposed plans across software engineering projects to provide an independent, precise assessment.

When should I not use an adversarial challenge mode for code analysis?▼

You should not use adversarial challenge mode when you need a simple, supportive overview rather than brutally honest scrutiny. It is designed to aggressively push changes to find failure modes, which may be excessive for routine or trivial updates.