Review is where coding agents either become trustworthy or become expensive noise. Claude Code’s review features are useful precisely because they are designed to slot into an existing workflow instead of pretending to replace it.
Anthropic’s docs make that clear: Code Review finds issues, tags severity, and keeps existing review workflows intact. That is the right mindset for a real team.
AI Search Snapshot
Use Claude Code review in two layers: local /code-review for fast diff checks while you are still working, and PR review with @claude review or @claude review once when you want broader multi-agent analysis. In both cases, a human review step still decides what ships.
Direct Answer
The best Claude Code review workflow is staged. First, run local review while you are still shaping the patch. Then use PR review when the change is ready for outside eyes. Anthropic’s docs say Code Review is neutral by default and does not block merges, which is a feature: it supports human reviewers rather than replacing them.
Claude should edit when the change is small, well-understood, and easy to verify. Claude should stop and hand off to human judgment when the issue is architectural, policy-sensitive, or too ambiguous to trust through automation alone.
Review Workflow Table
| Focus | What it means | Best fit | Review gate |
|---|---|---|---|
| Local review | /code-review in a session | Best for quick correctness checks before you push. | A human review step still decides whether findings matter. |
| PR review | @claude review or @claude review once | Best for multi-agent analysis on a real pull request. | Human reviewers decide what to fix and what to merge. |
| Instruction files | CLAUDE.md and REVIEW.md | Best for teaching Claude your repo’s standards and review priorities. | A human review step should confirm the rules still match the repo. |
| Merge behavior | Neutral check run by default | Claude surfaces issues but does not block the PR automatically. | Your human review and CI policy remain the real gate. |
Evaluation Criteria
- Use local review before PR review whenever possible.
- Teach the reviewer what matters with CLAUDE.md and REVIEW.md.
- Let Claude flag issues; let humans decide merge outcomes.
- Prefer stop-and-review over auto-fix when ambiguity or risk rises.
What Claude Code Review Actually Does
Anthropic’s Code Review docs describe a multi-agent analysis flow that looks for logic errors, security vulnerabilities, broken edge cases, and regressions. Findings are tagged by severity and posted inline, but the check run completes with a neutral conclusion so existing review workflows stay intact. That is an important design choice. Claude is there to widen coverage, not to silently become the merge authority.
When to Let It Review Locally
The local /code-review command is the lighter option. Anthropic says it reviews a diff in your terminal and can even apply findings with --fix. This is useful when you want a quick second look before the PR exists. It is the right place for cleanup, obvious correctness checks, and diff sanity, especially while you are still in the repo.
When to Use PR Review
PR review is better when you want more context and a more formal feedback trail. Anthropic documents both @claude review and @claude review once. The first subscribes the PR to future push-triggered reviews, while the second is the lighter one-shot path. That distinction matters for spend and noise, not just convenience.
How to Teach It What Matters
Anthropic’s docs explain the difference between CLAUDE.md and REVIEW.md. CLAUDE.md gives shared project context for all Claude Code tasks. REVIEW.md is the review-only instruction layer that can redefine what counts as Important, cap nit volume, skip generated files, or require stronger verification for certain claims. Good review behavior comes from these repo rules, not from generic prompting alone.
When Claude Should Stop
Claude should stop and hand back to human review when the issue becomes architectural, policy-sensitive, or not directly verifiable from the diff. Anthropic’s docs talk a lot about verification and severity, but the bigger rule is operational: a human review step should own anything where the business consequence is bigger than the convenience gain.
Review Checklist
- Run local /code-review before opening or updating a PR when possible.
- Use @claude review once for one-off feedback without subscribing every future push.
- Define repo-specific review rules in REVIEW.md.
- Keep Claude findings advisory unless your own CI intentionally parses them.
- Use a human review step before merge.
Bottom Line
Claude Code review works best as a force multiplier for an existing human review process.
Let it widen the search for bugs, but keep the final call in human hands.
FAQ
Does Claude Code Review block merging by default?
No. Anthropic’s docs say the check run completes with a neutral conclusion, so it does not block merges by default.
What is the difference between @claude review and @claude review once?
Anthropic says @claude review subscribes the PR to push-triggered reviews, while @claude review once triggers only a single review.
Should I use REVIEW.md or CLAUDE.md?
Use CLAUDE.md for shared project instructions and REVIEW.md for review-only behavior that should override the default review guidance.
When should Claude stop instead of editing more?
Claude should stop when the issue is ambiguous, architectural, or too risky to resolve without a clear human review step.
Verified External Sources
- Claude Code Docs: Code Review
- Claude Code Docs: Configure permissions
- Claude Code Docs: Choose a permission mode
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