codex

Runs OpenAI Codex CLI for independent code review, adversarial challenge, and consult sessions.

Updated Jun 22, 2026
One-click install
npx skills add https://github.com/aicodepro/ai-agent-nexi --skill codex-aicodepro
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: codex
Source: https://github.com/aicodepro/ai-agent-nexi/tree/main/agent/skills/gstack/codex
Command: npx skills add https://github.com/aicodepro/ai-agent-nexi --skill codex-aicodepro

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve? Getting a trustworthy second opinion on code changes is hard: self-review misses blind spots, and switching tools breaks flow. This Skill wraps the OpenAI Codex CLI so you can request an independent diff review, an adversarial challenge of your implementation, or a free-form consultation without leaving your current session. ## Core Features & Use Cases - Independent Code Review: Runs codex review as a pass/fail gate on your diff, catching issues your own review missed. - Adversarial Challenge Mode: Tries to break your code by attacking assumptions, edge cases, and failure paths. - Consult with Session Continuity: Ask Codex anything and keep follow-up questions in the same session context. - Use Case: Before merging a risky refactor, invoke the review mode to get a pass/fail verdict, then run challenge mode to probe the weakest part of the change. ## Quick Start Ask the assistant to run a codex review of the current diff and report whether it passes or fails.

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 a code diff before merging?

Invoke the codex review mode, which runs the OpenAI Codex CLI against your current diff and returns a pass/fail verdict. It acts as an independent reviewer so issues your own review missed are surfaced before merge.

What is adversarial code challenge mode?

Challenge mode instructs Codex to actively try to break your code by attacking assumptions, edge cases, and failure paths. It is useful after a review passes, to probe the weakest parts of an implementation.

Can I ask follow-up questions in a codex consult session?

Yes, consult mode keeps session continuity so follow-up questions retain prior context. You can ask Codex anything and refine the discussion across multiple turns without restating the problem.

Does the codex skill work in headless or spawned sessions?

Yes, the preamble detects session kind (interactive, headless, or spawned) and adapts. In spawned sessions it auto-chooses recommended options and skips interactive prompts; in headless mode it blocks when a question cannot be answered.

What are the limitations of CLI-based code review?

CLI-based review depends on the underlying model's context window and the quality of the diff provided. Very large changes may need to be split, and the pass/fail gate should complement rather than replace human review for critical code.