When should I use 'xhigh' reasoning effort?

Use 'xhigh' for critical systems and exhaustive analysis where depth is more important than speed, as these tasks can take up to 10 minutes to complete.

Is it safe to let Codex CLI modify my files?

The skill defaults to 'read-only' mode for safety. You must explicitly set it to 'workspace-write' if you want it to apply changes to your code.

What is the primary use for the Codex CLI skill?

It is designed for advanced code analysis, validation, and security reviews using specialized Codex models that offer higher reasoning capabilities than standard models.

Does this work outside of Git repositories?

Yes, but it requires the --skip-git-repo-check flag and user acknowledgement, as the tool usually uses Git to define trusted workspace boundaries.

Can I use Codex CLI in automated scripts?

Yes, by using the 'codex exec' command, the skill functions in non-interactive environments like CI/CD pipelines and shell scripts.

Codex CLI

Name: Codex CLI
Author: creator-hian

bycreator-hian

•

Security & Testing

Analyzes, reviews, and validates codebases using advanced OpenAI Codex models with configurable reasoning levels.

About

Codex CLI is a specialized tool for Claude Code that integrates OpenAI's powerful Codex models into your development environment for deep code analysis and validation. It allows developers to perform structured code reviews, security audits, and complex debugging tasks with granular control over reasoning effort and sandbox security. By supporting session persistence and non-interactive execution, this skill is ideal for both interactive development and automated CI/CD workflows where high-fidelity code understanding is required.

Key Features

Multi-directory support for analyzing cross-project dependencies and APIs
Optimized for CI/CD pipelines and non-TTY environments using exec mode
High-reasoning code analysis with GPT-5.2-codex and specialized models
Configurable sandbox modes including read-only and workspace-write for safety
2 GitHub stars
Session resume functionality to maintain context across multiple analysis steps

Use Cases

Analyzing architectural patterns across frontend and backend directories simultaneously
Automating code review feedback within CI/CD pipelines to catch bugs early
Performing deep security audits on critical logic using xhigh reasoning levels

About

Key Features

Multi-directory support for analyzing cross-project dependencies and APIs
Optimized for CI/CD pipelines and non-TTY environments using exec mode
High-reasoning code analysis with GPT-5.2-codex and specialized models
Configurable sandbox modes including read-only and workspace-write for safety
2 GitHub stars
Session resume functionality to maintain context across multiple analysis steps

Use Cases

Analyzing architectural patterns across frontend and backend directories simultaneously
Automating code review feedback within CI/CD pipelines to catch bugs early
Performing deep security audits on critical logic using xhigh reasoning levels