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Reconstruct the change
Read the request, diff, surrounding code, call sites, types, tests, configuration, and history needed to understand intended behavior.
Risk-focused review workflow
CategoryTesting & Security
Codex Skills for Code Review
Codex Skills for Code Review give Codex a systematic way to understand a change, trace affected behavior, find concrete defects, evaluate tests and security, and write useful review comments. Download the skills for pull requests, patches, refactors, migrations, and pre-merge checks.
Diff analysisBug findingSecurity checksReview comments
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task: review payment retry change
inspect:
- change intent
- call sites
- test coverage
verify: findings ranked by impactReview the behavior, not just the syntax
A clean diff can still break callers, weaken authorization, corrupt data, or fail only under an uncommon state.
Useful code review starts by understanding what the change intends to do and which assumptions surround it. The reviewer then follows data, control flow, interfaces, dependencies, and tests beyond the lines shown in the patch.
These skills help Codex prioritize actionable defects over style noise, attach findings to specific evidence, explain impact, and avoid claiming problems that the code does not support.
What the downloadable skills can do
What Codex Skills for Code Review examine
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Find correctness risks
Check boundary cases, state transitions, concurrency, data loss, error handling, compatibility, migrations, resource cleanup, and unintended side effects.
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Assess security and resilience
Review trust boundaries, authorization, validation, secrets, logging, dependency changes, injection paths, denial cases, timeouts, and retries.
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Write decision-ready findings
Rank issues by impact, cite the exact location, describe a realistic failure, separate blockers from suggestions, and note validation gaps.
A review with traceable evidence
Move from intent to affected behavior before judging individual lines
The process narrows attention toward risks introduced by the change and keeps comments specific enough for the author to act on.
workflow.statusREADY
Context → Plan → Work → Verify
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Establish purpose and scope
Read the issue and pull request description, identify expected behavior, locate sensitive areas, and note what the change claims not to affect.
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Trace each changed path
Follow callers, data structures, persistence, permissions, error paths, integrations, configuration, and platform-specific behavior.
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Challenge assumptions
Test boundaries, malformed input, repeated operations, partial failure, concurrency, null states, migration order, and backward compatibility.
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Deliver a concise review
List concrete findings first with severity and evidence, then unanswered questions, test gaps, and a short overall assessment.
Reviews for different change types
Adjust the checklist to the risk carried by the diff
A dependency update, schema migration, UI change, and authentication patch require different lines of inquiry.
Pull requests
Review a branch against its base, understand the stated goal, inspect checks, and produce focused inline or summary feedback.
Security-sensitive changes
Examine authentication, authorization, trust boundaries, data exposure, validation, dependencies, secrets, and audit events.
Migrations and refactors
Check data compatibility, rollout order, rollback behavior, old callers, invariant preservation, and regression coverage.
Release reviews
Inspect a collected change set for integration risks, configuration gaps, missing tests, deployment concerns, and release blockers.
Common review requests
Use the skills when a change needs more than a quick glance
The review can target one commit, a full branch, a pull request diff, or selected high-risk files.
01Review a pull request before merge
02Find bugs in a patch
03Check authorization and data exposure
04Evaluate test quality and missing cases
05Review a database migration
06Inspect dependency changes
07Assess a large refactor
08Write actionable review comments
People responsible for merge quality
Who Is This For?
These skills support reviewers who want clear findings and authors who want a strong self-review before asking teammates.
Software reviewers
Trace behavior beyond the diff and focus comments on defects, regressions, security, and maintainability risks.
Pull request authors
Run a structured self-review, remove accidental changes, strengthen tests, and provide better context before requesting review.
Engineering leads
Apply consistent severity, evidence, security, and quality expectations across repositories and reviewers.
Security teams
Add code-aware checks around access control, input boundaries, sensitive data, dependencies, logging, and abuse cases.
Good to know:
The skills provide a second set of eyes, not an approval guarantee. They may miss defects and should not replace responsible human review, automated checks, security testing, or specialist assessment.
Set the review standard
Installation Guide
Install the skills with the repository so Codex can use its architecture, contribution rules, tests, and severity definitions.
Download and extract the code review skills
Keep SKILL.md with its review stages, risk checklists, severity guidance, and supporting references.
Choose project or personal scope
Use project scope for repository-specific rules, or personal scope for a consistent review method across projects.
Document review priorities
Record critical domains, trust boundaries, compatibility promises, performance limits, code owners, severity definitions, and ignored generated files.
Provide comparison and test commands
Specify the base branch or commit plus approved build, test, analysis, dependency, and security checks.
Include the change intent
Supply the issue, acceptance criteria, pull request description, rollout plan, and any areas where the author wants deeper review.
Before requesting a review
Frequently Asked Questions
Answers about pull requests, false positives, security, large diffs, and suggested fixes.
Can the skills review a Git diff?+
Yes. They work best with the diff, the intended behavior, and access to surrounding code and tests.
Will every comment be a real bug?+
No review tool is perfect. The workflow requires evidence and realistic impact, but the author or reviewer should confirm each finding before acting.
Do they review code style?+
Only when style affects correctness, clarity, consistency, or stated repository rules. Concrete defects and meaningful risks take priority over preferences.
Can they perform a security review?+
They can inspect many code-level security risks, but they do not replace threat modeling, penetration testing, dependency scanning, or specialist security assessment.
What if the pull request is very large?+
The workflow maps the change first, identifies high-risk paths, reviews file groups in a sensible order, and states any areas that could not be checked deeply.
Find what matters before merge
Give Codex a review process that follows behavior, ranks real risk, and leaves authors with useful next steps.
Understand intent. Trace impact. Support every finding. Keep noise out of the review.