codex

Review code diffs against the base branch using the Codex CLI.

Updated Mar 29, 2026

Search Tags:#cli #codex #diff #code-review #adversarial #second-opinion

Ready to run

npx skills add https://github.com/zzxtbeta/design-handbook --skill codex-zzxtbeta

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: codex
Source: https://github.com/zzxtbeta/design-handbook/tree/main/.agents/skills/gstack/codex
Command: npx skills add https://github.com/zzxtbeta/design-handbook --skill codex-zzxtbeta

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Independent, brutally honest second opinions on code changes against the base branch, surfacing issues that might be missed.

Core Features & Use Cases

Three modes: review for a structured pass/fail gate on diffs, challenge for adversarial testing to break assumptions, and consult for on-demand prompts with session continuity.
Provides actionable critique and concrete suggestions that align with real-world coding workflows.

Quick Start

Ask Codex for a second opinion on your code changes by running the codex CLI in review mode.

Frequently Asked Questions about codex

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

FAQPage Schema

How do I get a second opinion on code changes against a base branch?▼

To get a second opinion on code changes, you can use the Codex CLI in review mode to receive a structured pass/fail gate verdict on your diff. It operates as an adversarial code review to surface issues missed in the base branch comparison.

What is adversarial code review and how does it test assumptions?▼

Adversarial code review is a technique that actively challenges assumptions in your code changes. The challenge mode uses the Codex CLI to adversarially test your diff, attempting to break underlying logic and surface hidden issues in your implementation.

Can I maintain session continuity for on-demand code review prompts?▼

Yes, you can maintain session continuity for on-demand code review prompts by using consult mode. This mode allows you to prompt the Codex CLI with specific questions while preserving the context of your ongoing review session.

Does Codex CLI return consistent gate verdicts for code diffs?▼

Yes, Codex CLI consistently returns structured gate verdicts for code diffs when operating in review mode. It preserves repository boundary instructions and logs results to the telemetry system when available to ensure reliable pass/fail outcomes.

When do I need an independent code review tool instead of a standard linter?▼

You need an independent code review tool when you require a brutally honest critique of logic and assumptions, whereas standard linters only check syntax. The challenge mode provides concrete suggestions by adversarially testing your changes against the base branch.