One-click install
npx skills add https://github.com/dayoumin/Skills --skill codex-dayoumin
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: codex
Source: https://github.com/dayoumin/Skills/tree/main/skills/codex
Command: npx skills add https://github.com/dayoumin/Skills --skill codex-dayoumin

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill provides direct access to OpenAI's Codex CLI, enabling advanced code analysis, refactoring, and automated editing. It streamlines complex coding tasks by leveraging a powerful AI model, reducing manual effort and potential errors.

Core Features & Use Cases

  • Code Analysis & Review: Perform read-only analysis to identify bugs, performance issues, or suggest best practices.
  • Automated Code Editing: Apply local edits, refactor code, or implement new features directly within the workspace.
  • Flexible Sandbox Modes: Choose from read-only, workspace-write, or danger-full-access to control AI permissions.
  • Use Case: Ask Codex to "Review this Python script for potential bugs and suggest performance optimizations" using read-only mode, then, if approved, "Apply the suggested fixes" using workspace-write mode.

Quick Start

Ask Claude to "Run Codex to analyze the 'main.py' file for security vulnerabilities using gpt-5-codex and high reasoning effort."

Frequently Asked Questions about codex

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

FAQPage Schema
How do I use Codex CLI to analyze code for bugs and security issues?▼

Code analysis with Codex CLI involves running `codex exec` with your file and specifying `read-only` mode to prevent unwanted changes. You select the model (e.g., `gpt-5-codex`), set reasoning effort (`high` for thorough review), and Codex scans for bugs, performance problems, or security vulnerabilities without modifying your code.

Can I apply code refactoring automatically across my project files?▼

Yes. After analyzing code in read-only mode, use `codex exec` with `workspace-write` mode to apply refactoring suggestions directly. Codex implements the changes locally while preserving your project structure, making it practical for large-scale refactoring without manual editing.

What's the difference between read-only, workspace-write, and danger-full-access sandbox modes?▼

Sandbox modes control Codex permissions: `read-only` prevents any modifications and is safe for analysis; `workspace-write` allows edits to your files and is suitable for refactoring; `danger-full-access` grants unrestricted permissions for complex automated tasks but requires careful oversight.

How do I resume an interrupted Codex session?▼

Use the `codex resume` command to continue from where a previous `codex exec` session stopped. This preserves context and reasoning from the interrupted task, avoiding redundant analysis and reducing compute overhead.

What models and reasoning levels does Codex support?▼

Codex supports multiple models including `gpt-5-codex` and reasoning effort levels like `high` for intensive analysis. The metadata specifies model selection and reasoning effort as functional requirements you configure per task to balance thoroughness and execution time.

Do I need local project setup before running Codex analysis?▼

Yes. Codex operates on local projects, so you need your code files accessible in your workspace. The Skill applies read-only or write-enabled sandbox modes based on your chosen permissions, but the project structure and files must already be present.