CodeRabbit CI Integration

Overview

Integrate CodeRabbit into your CI/CD pipeline as a merge gate. CodeRabbit posts a GitHub Check on each PR, and you can require this check to pass before merging. This skill covers branch protection rules, GitHub Actions workflows that react to CodeRabbit reviews, and strategies for enforcing review quality in CI.

Prerequisites

• CodeRabbit GitHub App installed on your repository
• GitHub repository with branch protection enabled
• .coderabbit.yaml committed to repository root
• GitHub Actions enabled on the repository

Instructions

Step 1: Enable CodeRabbit as a Required Status Check

1. Go to GitHub repo > Settings > Branches > Branch protection rules
2. Click "Add rule" (or edit existing rule for `main`)
3. Enable "Require status checks to pass before merging"
4. Search for "coderabbitai" in the status checks list
5. Select it as a required check
6. Save changes

Result: PRs cannot be merged until CodeRabbit completes its review.

Step 2: Configure Review Approval Behavior

# .coderabbit.yaml - Control when CodeRabbit blocks merge
reviews:
  request_changes_workflow: true   # CodeRabbit marks review as "Changes Requested" for issues
  # When true: PRs with issues show as "Changes Requested" (blocks merge if reviews required)
  # When false: CodeRabbit only posts "Comment" reviews (never blocks merge)

  profile: "assertive"             # Controls comment volume
  # chill: fewer comments, only critical issues
  # assertive: balanced, blocks on significant issues
  # nitpicky: detailed comments, blocks more frequently

  auto_review:
    enabled: true
    drafts: false                  # Don't run CI-blocking reviews on drafts
    base_branches:
      - main
      - develop
      - "release/*"
    ignore_title_keywords:
      - "WIP"
      - "DO NOT MERGE"

Step 3: Create a Review Gate Workflow

# .github/workflows/coderabbit-gate.yml
name: CodeRabbit Review Gate

on:
  pull_request_review:
    types: [submitted]

jobs:
  check-review:
    # Only run when CodeRabbit submits a review
    if: github.event.review.user.login == 'coderabbitai[bot]'
    runs-on: ubuntu-latest
    steps:
      - name: Evaluate CodeRabbit review
        uses: actions/github-script@v7
        with:
          script: |
            const reviews = await github.rest.pulls.listReviews({
              owner: context.repo.owner,
              repo: context.repo.repo,
              pull_number: context.issue.number,
            });

            const crReview = reviews.data
              .filter(r => r.user.login === 'coderabbitai[bot]')
              .pop();

            if (!crReview) {
              core.info('No CodeRabbit review found yet.');
              return;
            }

            core.info(`CodeRabbit review state: ${crReview.state}`);

            if (crReview.state === 'CHANGES_REQUESTED') {
              core.setFailed('CodeRabbit requested changes. Address review feedback before merging.');
            }

Step 4: Add PR Size Check with CodeRabbit

# .github/workflows/pr-size-check.yml
name: PR Size Check

on:
  pull_request:
    types: [opened, synchronize]

jobs:
  check-size:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Check PR size
        run: |
          CHANGES=$(git diff --stat origin/${{ github.base_ref }}...HEAD | tail -1)
          LINES=$(echo "$CHANGES" | grep -oP '\d+ insertion' | grep -oP '\d+' || echo 0)
          DELETIONS=$(echo "$CHANGES" | grep -oP '\d+ deletion' | grep -oP '\d+' || echo 0)
          TOTAL=$((LINES + DELETIONS))

          echo "Total lines changed: $TOTAL"

          if [ "$TOTAL" -gt 1000 ]; then
            echo "::warning::PR has $TOTAL lines changed. CodeRabbit works best with PRs under 500 lines."
            echo "Consider splitting into smaller PRs for better review quality."
          fi

Step 5: Notify on CodeRabbit Findings

# .github/workflows/coderabbit-notify.yml
name: CodeRabbit Notification

on:
  pull_request_review:
    types: [submitted]

jobs:
  notify:
    if: >
      github.event.review.user.login == 'coderabbitai[bot]' &&
      github.event.review.state == 'changes_requested'
    runs-on: ubuntu-latest
    steps:
      - name: Post Slack notification
        uses: slackapi/slack-github-action@v1.27.1
        with:
          payload: |
            {
              "text": "CodeRabbit found issues in PR #${{ github.event.pull_request.number }}: ${{ github.event.pull_request.title }}",
              "blocks": [
                {
                  "type": "section",
                  "text": {
                    "type": "mrkdwn",
                    "text": "*CodeRabbit Review*: Changes requested on <${{ github.event.pull_request.html_url }}|PR #${{ github.event.pull_request.number }}>"
                  }
                }
              ]
            }
        env:
          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}

Step 6: Enforce CodeRabbit via Branch Protection API

set -euo pipefail
# Programmatically set CodeRabbit as a required check
OWNER="your-org"
REPO="your-repo"
BRANCH="main"

gh api "repos/$OWNER/$REPO/branches/$BRANCH/protection" \
  --method PUT \
  --field 'required_status_checks={"strict":true,"contexts":["coderabbitai"]}' \
  --field 'required_pull_request_reviews={"required_approving_review_count":1}' \
  --field 'enforce_admins=true' \
  --field 'restrictions=null'

echo "Branch protection updated: CodeRabbit review required for merge"

Output

• CodeRabbit configured as a required status check on protected branches
• GitHub Actions workflow that gates merges on CodeRabbit approval
• PR size warnings to improve review quality
• Slack notifications for CodeRabbit findings
• Branch protection enforced via API

Error Handling

Issue	Cause	Solution
"coderabbitai" not in status checks list	App not installed or no PRs reviewed yet	Install App, create a test PR, then configure
Review blocks all PRs	request_changes_workflow: true with aggressive profile	Switch to chill or set to false
CI times out waiting for review	Large PR or CodeRabbit backlog	Reviews take 2-15 min depending on PR size
Draft PRs blocked	drafts: true in config	Set drafts: false to skip draft PR reviews
Status check stays pending	CodeRabbit outage	Check status.coderabbit.ai; admin merge if needed

Resources

• CodeRabbit Configuration Reference
• GitHub Branch Protection
• GitHub Actions: Pull Request Events

Next Steps

For deployment and multi-repo rollout, see coderabbit-deploy-integration.