Cross-model validation using Codex CLI's MCP tools. Claude writes code, Codex reviews it — different architecture, different training distribution, no self-approval bias.
Core insight: Single-model self-review is systematically biased. Cross-model review catches different bug classes because the reviewer has fundamentally different blind spots than the author.
The Codex CLI MCP server exposes two tools relevant for reviews:
Use this skill for cross-model code reviews using OpenAI Codex CLI via MCP. Activates on mentions of codex review, cross-model review, code review with codex, peer review, review my code, review this PR, review changes, codex check, second opinion, or gpt review. Source: hyperb1iss/hyperskills.