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World desk7 min

How to Put Claude in Front of Human Pull Request Review

Claude can review GitHub PRs before human review through Anthropic’s managed service or a custom GitHub Action. Here’s how triggers, setup, cost, and CI security differ.
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Claude can review GitHub pull requests before a human reviewer looks at them, but the documented options are different: Anthropic’s managed Claude Code Review GitHub App, or a GitHub Actions workflow that your team configures. The managed service can run when a PR opens or becomes ready, on every push, or on request. It posts findings but does not approve or block the PR; human review remains part of the workflow.

That makes “before humans see it” a queueing choice, not a claim that AI review replaces people. Public documentation describes how to set up these workflows, but does not establish that a particular publisher or engineering team uses them internally.

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Which Claude pull request review option fits your team?

Choose between a managed service that Anthropic configures through a GitHub App and a custom workflow that your team builds around the Claude Code Action. They are separate routes: the available documentation does not establish that the Action behaves or bills identically to managed Code Review.

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Consideration Managed Claude Code Review Custom GitHub Actions workflow
Who operates it Anthropic-managed feature, enabled by an organization owner or primary owner through the GitHub App setup flow. Your team configures and maintains the workflow, Action inputs, and CI environment.
Triggers Review when a PR opens or is marked ready, after every push, or by a manual comment beginning “@claude review.” The Action supports configurable inputs such as a trigger phrase; the precise trigger behavior depends on your workflow.
Repository guidance Supports CLAUDE.md files at different directory levels and a root REVIEW.md file. The Action is configurable, including with a prompt; the documented inputs do not make its behavior identical to managed Code Review.
Permissions and security The GitHub App requests read and write access to repository contents, issues, and pull requests. Your team owns workflow permissions, checkout choices, handling of secrets, and output validation.
Billing and review volume Anthropic reports an average per-review cost; every-push reviews run most often and cost the most overall. Usage is billed separately from plan-included usage. Billing depends on the workflow and authentication or hosting arrangement; the cited Action documentation does not establish that managed-service pricing applies.
Operational ownership Anthropic operates the managed review service; your organization still selects repositories, triggers, guidance, and spend controls. Your engineering team retains more responsibility for implementation, security configuration, and ongoing maintenance.

Use the managed route if you want the documented organization-level setup and trigger choices. Use a custom Action when your team needs to own the workflow configuration; treat its security and billing as separate design questions rather than assuming the managed product’s terms apply.

How to set up managed Claude Code Review for GitHub

  1. Confirm eligibility and access. As described in Anthropic’s setup guide dated September 2, 2026, the feature is in research preview for Team and Enterprise plans. An owner or primary owner needs permission to install GitHub Apps in the GitHub organization. Organizations with zero data retention enabled cannot use the feature.
  2. Install and select repositories. Follow the organization setup flow to install the Claude GitHub App and choose which repositories to include. The app requests read and write permissions for repository contents, issues, and pull requests.
  3. Choose a trigger for each repository. Select review on PR opening or when a draft is marked ready, review after every push, or manual review. The cost implications are explained below.
  4. Check that the integration runs. For an automatic trigger, Anthropic says a “Claude Code Review” check run should appear within a few minutes. In manual mode, add a top-level PR comment beginning “@claude review.”

When should Claude review each pull request?

The trigger determines how early and how often the review runs. The managed service offers three choices:

Trigger When it runs Practical trade-off
PR opened or marked ready Once when the PR is opened or moved from draft to ready. Provides an initial pass without running on every subsequent update.
Every push After each push to the PR branch. Keeps feedback current as the diff changes, but produces the most reviews and costs the most overall.
Manual request When an authorized commenter adds a top-level “@claude review” comment to an open, non-draft PR. Lets a reviewer request a pass when useful. A manual request also opts that PR into reviews on subsequent pushes.

For a manual request, the commenter must have owner, member, or collaborator access. The PR must be open and not a draft. A team can use the one-time PR trigger when it wants an initial automated pass, every-push review when continuous feedback justifies the extra runs, or manual review when it wants to control which PRs receive it.

How Claude Code Review reports findings

Anthropic describes managed review as multiple specialized agents examining a PR’s changes alongside the surrounding codebase. They look for different issue classes in parallel; a verification step checks findings against code behavior to filter false positives. Findings are then deduplicated, ranked by severity, and posted as inline comments on relevant lines. If no issue is found, the service posts a short confirmation.

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The review is informational: Anthropic says it does not approve or block PRs, leaving the existing review workflow intact. Treat the comments as input for the human review, not as a merge decision or evidence that a change is defect-free.

How to tailor reviews to repository conventions

For managed Code Review, Anthropic documents two ways to give the review repository-specific context:

  • CLAUDE.md: Instructions can live at different directory levels. Anthropic says newly introduced violations are treated as nit-level findings, and the tool may flag documentation that has become outdated.
  • Root REVIEW.md: Use this file for team style and language conventions, requirements to flag, and categories to skip. These instructions are additive to the default correctness checks.

Keep guidance specific enough to be useful: state what the team considers a violation and which categories should be ignored, rather than relying on broad preferences. These files guide the managed review; they should not be assumed to configure a separately built GitHub Actions workflow in the same way.

How much does managed Claude Code Review cost?

Anthropic’s September 2, 2026 setup article reports an average cost of $15–25 per review. That is the vendor’s average, not a guaranteed price for every PR: the article says actual cost varies with PR size, codebase complexity, and the number of issues requiring verification. Usage is billed separately through usage credits and does not count against plan-included usage.

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Anthropic says the organization can set a monthly spend cap and view usage analytics. Costs appear on the Anthropic bill even if the organization uses Bedrock or Vertex for other Claude Code features. Check the current setup and billing terms before enabling the feature, since preview availability and vendor pricing can change. The trigger affects total spend: every-push review generates the most runs, and a manual request also enables review on later pushes for that PR.

What to secure in a custom GitHub Actions workflow

A custom Action gives the engineering team control over workflow design, which also means the team must address the security implications of running automation around untrusted PR content. Anthropic’s Action security guidance specifically warns about workflows such as pull_request_target and workflow_run, which may run with base-repository secrets. Checking out untrusted PR content into the workspace root before running the Action can create risk.

  • Use the safer checkout patterns described in the Action’s security documentation; do not casually place untrusted PR files in a workspace that can access secrets.
  • Grant the workflow only the permissions it needs.
  • Validate Action output before using it in later workflow steps.
  • Account for prompt injection from untrusted content in the PR or repository.

These are configuration risks to handle, not proof that every Action workflow is unsafe. The Action usage documentation describes inputs including a prompt, trigger phrase, Claude CLI arguments, and authentication through Amazon Bedrock or Google Vertex AI using OIDC. Confirm the exact workflow and Action version you plan to use; do not infer managed Code Review behavior or billing from the general-purpose Action.

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When to add a security-focused review

Anthropic documents both an on-demand /security-review command in Claude Code and a GitHub Actions route that reviews new PRs for security vulnerabilities. The documented categories include SQL injection, cross-site scripting, authentication and authorization flaws, insecure data handling, and dependency vulnerabilities. The Action route can use filtering rules tailored to team security policies and post inline comments with concerns and suggested fixes.

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Anthropic’s guidance explicitly says automated security reviews should complement, not replace, existing security practices and manual code review. Its August 6, 2025 product announcement describes two issues its own workflow caught before merge: a DNS-rebinding-exploitable remote code execution issue in an internal tool and an SSRF issue in a credential proxy. Those are vendor-reported examples, not an independent benchmark or a measure of recall, precision, or general performance.

What the available evidence does—and does not—show

Anthropic’s public product documentation explains the managed feature’s workflow and setup, but does not provide an independent measure of review accuracy, defect recall, false-negative rate, or performance across repositories. The Code Review plugin listing describes five reviewer perspectives—CLAUDE.md compliance, bug detection, git history, prior PR comments, and code-comment verification—and a default confidence threshold of 80 on a 0-to-100 scale. Those details describe the plugin listing; they do not establish that managed Code Review uses the same architecture or that the threshold guarantees accuracy.

For an engineering team, a useful rollout is to keep existing human approval requirements, start with a trigger and spend cap the team can sustain, and inspect whether comments are actionable in its own repositories. The public documentation does not establish a general savings figure or a reliable rate of defects caught, so do not treat vendor examples or plugin confidence scores as proof of expected results.

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