Does this skill require external tools?

Yes, it requires the codex CLI to be installed and configured as it invokes the 'codex exec' command to process the review.

What format does the review feedback come in?

Feedback is structured into four specific sections: Blocking Issues, Non-blocking Issues, Outstanding Questions, and Further Ideas.

What is the codex-review skill for Claude Code?

It is a specialized capability that allows Claude to send technical artifacts to OpenAI's Codex for an independent, high-reasoning review to ensure design quality.

Does codex-review handle sensitive information?

The skill is designed to strip sensitive data like API keys, tokens, and credentials from the content before it is sent to the external Codex model.

When is the best time to invoke a Codex review?

It is most effective during early phases like brainstorming, requirement gathering, and design documentation when architectural issues are cheapest to fix.

Codex External Review

Name: Codex External Review
Author: williballenthin

bywilliballenthin

•

Security & Testing

Requests a second perspective from OpenAI's Codex models to identify gaps, risks, and architectural flaws in technical designs and implementations.

The codex-review skill bridges Claude with OpenAI's Codex ecosystem to provide an independent 'second pair of eyes' on technical work. By invoking high-reasoning models via the codex CLI, it specializes in scrutinizing brainstorming sessions, requirement documents, and system architectures to catch critical logic errors and design flaws before implementation begins. It provides a structured feedback loop categorized by severity—Blocking, Non-blocking, Questions, and Ideas—helping developers refine their reasoning and ensure robust software design through multi-model validation.

Key Features

01Structured feedback reporting categorized by severity and impact

02Pre-submission data scrubbing to protect sensitive credentials

031 GitHub stars

04Automated external technical reviews via high-reasoning OpenAI models

05Early-stage validation for architecture, designs, and requirements

06Seamless integration with VCS for reviewing code diffs and implementations

Use Cases

01Validating complex architectural designs and technical proposals for hidden risks

02Identifying gaps or contradictions in system requirements during the planning phase

03Getting an objective second opinion on critical code diffs or refactoring plans

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add williballenthin/aiwilli codex-review

For use in Claude.ai and ChatGPT

Download Skill