Run an independent code review using the OpenAI Codex CLI in headless mode. Gets a second opinion from a different model family (the current Codex models) on recent changes, a PR, a commit, or the whole app — covering bugs, regressions, security, data consistency, UX/state bugs, performance risks, and testing gaps. Saves a severity-prioritised report to .jez/reviews/. Triggers: 'codex review', 'review with codex', 'independent code review', 'what does codex think', 'get codex to review'.
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Use codex-review to perform an independent advisory review of [codebase and scope] and save a severity-prioritized report; do not apply any findings without my approval.
Required inputs
[codebase and scope]
User-approved starter prompt based on a pinned source version; check current skill requirements before running. Task evidence ↗
SKILL.md
name: codex-reviewdescription: "Run an independent code review using the OpenAI Codex CLI in headless mode. Gets a second opinion from a different model family (the current Codex models) on recent changes, a PR, a commit, or the whole app — covering bugs, regressions, security, data consistency, UX/state bugs, performance risks, and testing gaps. Saves a severity-prioritised report to .jez/reviews/. Triggers: 'codex review', 'review with codex', 'independent code review', 'what does codex think', 'get codex to review'."compatibility: Designed for Claude Code (or similar products)
Codex Review
Run an independent code review via the OpenAI Codex CLI (codex review). The value is a second opinion from a different model family than the one that wrote the code — Codex catches things Claude misses due to author bias.
Complements brains-trust (generic multi-model opinions). This skill is specialised: git-aware, uses a tuned review prompt, saves structured output.
When to Use
After a meaningful change, before committing or shipping
Before opening a PR, to self-review with an independent reviewer
When something feels off but you can't articulate what
Periodic whole-app reviews for projects in active development
When the user explicitly asks for an "independent" or "second opinion" review
Do NOT use for:
Trivial changes (typos, one-line fixes)
Research questions or architecture discussions — use brains-trust instead
Auto-fixing issues — this is advisory only
Preflight
Confirm Codex CLI is installed:
which codex
If missing: tell the user to install it (brew install codex on macOS, or see https://github.com/openai/codex) and stop. Do not continue.
Confirm auth: the first codex review call will fail clearly if not logged in. If that happens, instruct the user to run codex login and stop.
Determine scope
Pick the scope flag based on what the user asked for:
"review my changes" / "review what I just did" / "review uncommitted"
--uncommitted
"review this branch vs main" / "review the PR"
--base main (or the branch they name)
"review commit abc123"
--commit abc123
Default is whole-app review. A bare "codex review" with no qualifier means review the entire codebase at HEAD — not just uncommitted changes. Only use --uncommitted if the user specifically refers to their recent/uncommitted work.
If ambiguous, ask once. Don't guess on commits or branches.
Run the review
The canonical review prompt lives in prompt.md next to this skill. Pipe it via stdin to avoid shell escaping:
mkdir -p .jez/reviews
TS=$(date +%Y-%m-%d-%H%M)
OUT=".jez/reviews/codex-${TS}.md"
SKILL_DIR="$(dirname "$0")" # or use the skill's absolute path
# Example: uncommitted changes
cat "${SKILL_DIR}/prompt.md" | codex review --uncommitted - 2>&1 | tee "$OUT"
Other scopes:
# Vs base branch
cat prompt.md | codex review --base main - 2>&1 | tee "$OUT"
# Specific commit
cat prompt.md | codex review --commit abc123 - 2>&1 | tee "$OUT"
# Current HEAD (no scope flag)
cat prompt.md | codex review - 2>&1 | tee "$OUT"
codex review can take several minutes on a large diff. Let it run.
Summarise for the user
After Codex finishes:
Print the output path: Report saved to .jez/reviews/codex-<timestamp>.md
Read the saved report and extract the top findings (anything under Critical and High)
Show them inline in the chat, with file:line references intact
Offer to action specific findings: "Want me to fix the SQL injection in auth.ts:42?"
Rules
Advisory only. Never auto-apply Codex's suggestions. Read the findings, discuss with the user, fix with their approval.
Don't leak Claude's reasoning into the prompt. The prompt.md file is deliberately neutral — Codex reviews the code, not Claude's narrative about the code. Independence is the whole point.
Save to .jez/reviews/, never .claude/ (protected directory).
One report per run. Don't overwrite — the timestamp makes each run unique so the user can compare.
Report what Codex actually found. Don't soften, editorialise, or skip findings you disagree with. If you think Codex is wrong about something, say so as your own opinion after showing what Codex said.
Verification
The skill is working if:
Preflight correctly detects a missing codex binary
The right scope flag is chosen based on user intent
The report file appears in .jez/reviews/ with a sensible timestamp
The file contains severity-prioritised findings with file:line refs
Claude surfaces the top findings without auto-fixing them