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To have Claude review GitHub pull requests before a person reviews them, choose either Anthropic’s managed Claude Code Review or a team-configured Claude Code GitHub Action. The managed service can review a pull request when it opens or becomes ready, after each push, or when someone requests a review. It adds findings to the pull request but does not approve or block it, so keep human review and your existing merge controls in place. The public documentation describes these workflows, not this site’s internal process.
What happens when Claude reviews a pull request?
Anthropic’s managed Claude Code Review examines a change in the context of the repository, rather than treating the diff as the whole story. Its documented process uses multiple specialized agents to inspect changes and surrounding code in parallel, followed by verification intended to check findings against actual code behavior. Findings are deduplicated, ranked by severity, and posted as inline comments. If it finds no issue, it posts a brief confirmation. Anthropic says the feature does not approve or block pull requests; human review and repository merge rules remain separate. Anthropic’s setup guide describes the managed product.
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That distinction matters: a review comment is input for a reviewer, not a pass/fail security guarantee. Anthropic’s security-review guidance says automated reviews should complement existing security practices and manual review. Read its security-review guidance.
Should you use managed Code Review or a GitHub Action?
These are different ways to put Claude into a pull request workflow. Managed Code Review is set up through Anthropic’s organization and GitHub App flow. The Claude Code GitHub Action is a configurable workflow that your team installs and maintains. The Action documentation does not establish that it behaves or is billed identically to managed Code Review.
| Consideration | Managed Claude Code Review | Custom Claude Code GitHub Action |
|---|---|---|
| Management | Anthropic-managed feature configured for an organization through a GitHub App. See the setup guide. | Your team configures the GitHub workflow and Action inputs. See the usage documentation. |
| Triggers | Run on pull request opening or when marked ready, after every push, or on a manual request. A manual request also opts that pull request into reviews after later pushes. | The Action supports configurable triggers, including a trigger phrase; the exact behavior depends on the workflow your team writes. |
| Repository-specific guidance | Can use CLAUDE.md files and a root REVIEW.md to guide review behavior. | The Action accepts a prompt and Claude CLI arguments; your workflow determines how repository guidance is supplied. |
| Permissions and secrets | The GitHub App requests read and write access to repository contents, issues, and pull requests. | Your workflow defines permissions and handles credentials. Anthropic warns that certain event patterns and unsafe checkout choices can expose secrets or untrusted content; follow the Action security guidance. |
| Billing | As described by Anthropic on September 2, 2026, usage is billed separately through usage credits, outside plan-included usage. Anthropic reports an average of $15–25 per review; this is a vendor-reported average, not a guaranteed price. | Not stated in the cited Action usage documentation; check the billing terms for the authentication and service configuration you use. |
| Operational ownership | Anthropic operates the managed review service; your organization selects repositories, triggers, and guidance. | Your team owns the workflow configuration, permissions, prompts, and its maintenance. |
When the managed option fits
Use managed Code Review when you want the organization-level GitHub App setup and its built-in review behavior, rather than implementing a review workflow yourself. It is the more directly documented route if the goal is to enable reviews across selected repositories with a choice of standard triggers.
When a custom Action fits
Use a custom Action when your team needs to control the workflow, prompt, trigger phrase, or Claude CLI arguments. The Action documentation also describes authentication through Amazon Bedrock or Google Vertex AI using OIDC. Treat the workflow as your own CI integration: its behavior, permissions, and billing depend on your configuration, not automatically on the managed product’s terms.
How do you enable managed Claude Code Review?
Anthropic’s setup guide, dated September 2, 2026, says an owner or primary owner on a Claude Team or Enterprise plan needs permission to install GitHub Apps in the GitHub organization. In the setup flow, install the Claude GitHub App, select repositories, and choose a trigger for each.
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- Confirm eligibility and access. Check that the organization is on a Team or Enterprise plan and that the setup owner can install GitHub Apps.
- Install and scope the app. Install the Claude GitHub App in the GitHub organization and select the repositories it should access. The app requests read and write permissions for repository contents, issues, and pull requests.
- Choose a trigger for each repository. Select a review on pull request opening or when it is marked ready, a review after every push, or manual review. Every-push reviews run most often and cost the most.
- Provide repository guidance if needed. Add team instructions using CLAUDE.md files at relevant directory levels and/or a root REVIEW.md. Anthropic says these instructions supplement default correctness checks; newly introduced violations of instructions are treated as nit-level findings, and the tool may flag outdated documentation.
- Confirm the integration runs. For an automatic trigger, Anthropic says a “Claude Code Review” check run should appear within a few minutes. For manual mode, add a top-level pull request comment beginning with
@claude review.
A manual request is available to a commenter with owner, member, or collaborator access when the pull request is open and not a draft. Requesting one also opts that pull request into automatic reviews after later pushes. Details can change, so check Anthropic’s current setup instructions before enabling the feature.
How do you make a custom GitHub Action safer?
A Claude review action runs inside CI, where event choices, repository permissions, checkouts, and secrets matter. Anthropic’s security documentation specifically warns about workflows such as pull_request_target and workflow_run, which may execute with base-repository secrets. It also warns against checking out untrusted pull request content into the workspace root before running the action. These are configuration risks to address, not proof that every Action setup is unsafe.
- Use the minimum GitHub workflow permissions the job needs.
- Follow the Action’s documented checkout patterns; do not place untrusted pull request content in a privileged workspace in a way that can affect later steps.
- Keep secrets out of untrusted pull request execution paths, especially when using event types that can access base-repository secrets.
- Validate and constrain Action outputs before later workflow steps use them.
- Assume pull request content may contain prompt-injection attempts, and avoid giving the model or workflow authority that the task does not require.
For the exact supported inputs and safer workflow patterns, use the Action usage guide alongside its security documentation. The Action supports configurable prompts, trigger phrases, Claude CLI arguments, and OIDC authentication options for Amazon Bedrock or Google Vertex AI; select the instructions and credentials for the specific workflow you build.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How much does managed Claude Code Review cost?
Anthropic’s September 2, 2026 setup article reports an average of $15–25 per review. This is Anthropic’s stated average, not a fixed per-pull-request rate: the company says cost varies with pull request size, codebase complexity, and how many issues need verification. The service is in research preview for Team and Enterprise plans and, according to that article, is unavailable to organizations with zero data retention enabled.
Anthropic says review usage is billed separately through usage credits and does not count against plan-included usage. The setup article also describes a monthly spend cap and usage analytics. Trigger frequency directly affects volume: every-push mode runs more reviews and costs more than a single review on opening or a manual request. Review current terms in Anthropic’s setup article before estimating a budget, because eligibility and billing terms can change.
Best Value
Can Claude review security issues too?
Anthropic documents both an on-demand /security-review command in Claude Code and a GitHub Actions route for reviewing new pull requests for vulnerabilities. Documented issue categories include SQL injection, cross-site scripting, authentication and authorization flaws, insecure data handling, and dependency vulnerabilities. The Action can apply filtering rules tailored to team security policies and post inline comments with concerns and suggested fixes. These are security-review capabilities, not a reason to remove security controls or manual review.
In an August 6, 2025 product announcement, Anthropic said its own workflow caught a DNS-rebinding-exploitable remote code execution issue in an internal tool and an SSRF issue in a credential proxy before merge. Those are vendor-reported examples, not an independent measure of detection rates or evidence that the same results will occur in another codebase. Read Anthropic’s announcement.
What can you conclude about review quality?
The cited public documentation does not provide an independent measurement of accuracy, defect recall, false-negative rate, or performance across repositories. Anthropic’s examples show what it says its own workflow found, but do not establish how often the system catches real defects or how often findings are incorrect.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsAnthropic’s marketplace listing for a separate Code Review plugin describes five reviewer perspectives—CLAUDE.md compliance, bug detection, git history, prior pull request comments, and code-comment verification—and a default confidence threshold of 80 on a 0–100 scale. That description applies to the plugin listing; it does not establish that managed Code Review uses the same architecture or that a confidence score guarantees a correct finding. See the plugin listing.
The practical way to use Claude is as an additional reviewer whose comments humans assess. Choose the managed service for a centrally configured review feature or build a custom Action when the team needs workflow-level control, and keep permissions, cost, and human oversight explicit in either case.
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