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Codex Integration for Claude Code

Purpose

Enable Claude Code to invoke the Codex CLI (codex exec and session resumes) for automated code analysis, refactoring, and editing workflows.

Prerequisites

• codex CLI installed and available on PATH.
• Codex configured with valid credentials and settings.
• Confirm the installation by running codex --version; resolve any errors before using the skill.

Installation

Download this repo and store the skill in ~/.claude/skills/codex

git clone --depth 1 [email protected]:skills-directory/skill-codex.git /tmp/skills-temp && \
mkdir -p ~/.claude/skills && \
cp -r /tmp/skills-temp/ ~/.claude/skills/codex && \
rm -rf /tmp/skills-temp

Usage

Example Workflow

User prompt:

Use codex to analyze this repository and suggest improvements for my claude code skill.

Claude Code response: Claude will activate the Codex skill and:

1. Ask which model to use (gpt-5 or gpt-5-codex)
2. Ask which reasoning effort level (low, medium, or high)
3. Select appropriate sandbox mode (defaults to read-only for analysis)
4. Run a command like:

codex exec -m gpt-5-codex \
  --config model_reasoning_effort="high" \
  --sandbox read-only \
  --full-auto \
  --skip-git-repo-check \
  "Analyze this Claude Code skill repository comprehensively..."

Result: Claude will summarize the Codex analysis output, highlighting key suggestions and asking if you'd like to continue with follow-up actions.

Detailed Instructions

See SKILL.md for complete operational instructions, CLI options, and workflow guidance.