GitNexus/.github/workflows/claude-code-review.yml

name: Claude Code Review

# Uses pull_request_target so the workflow runs as defined on the default branch,
# which allows access to secrets for posting review comments on fork PRs.
# SECURITY: The checkout below uses the PR head SHA to review the correct code.
# The claude-code-action sandboxes execution — it does NOT run arbitrary code
# from the checked-out source.

on:
  # Trigger only when explicitly requested:
  #   - Add the "claude-review" label to a PR, OR
  #   - Comment "@claude" or "/review" on a PR
  pull_request_target:
    types: [labeled]
  issue_comment:
    types: [created]

# Serialize per-PR so concurrent @claude comments don't race on the
# temporary fork branch push/delete.
concurrency:
  group: claude-review-${{ github.event.issue.number || github.event.pull_request.number }}
  cancel-in-progress: false

jobs:
  claude-review:
    # Run only when:
    #   1. The "claude-review" label is added to a non-draft PR by a trusted contributor, OR
    #   2. A trusted contributor comments "@claude" or "/review" on a PR
    if: |
      (
        github.event_name == 'pull_request_target' &&
        github.event.label.name == 'claude-review' &&
        github.event.pull_request.draft == false &&
        (github.event.pull_request.author_association == 'OWNER' ||
         github.event.pull_request.author_association == 'MEMBER' ||
         github.event.pull_request.author_association == 'COLLABORATOR')
      ) ||
      (
        github.event_name == 'issue_comment' &&
        github.event.issue.pull_request &&
        (contains(github.event.comment.body, '@claude') ||
         contains(github.event.comment.body, '/review')) &&
        (github.event.comment.author_association == 'OWNER' ||
         github.event.comment.author_association == 'MEMBER' ||
         github.event.comment.author_association == 'COLLABORATOR')
      )
    runs-on: ubuntu-latest
    timeout-minutes: 30
    permissions:
      contents: write       # needed to create fork branch ref via API
      pull-requests: write
      issues: read
      id-token: write

    steps:
      # For issue_comment triggers, resolve the PR number, head SHA, and branch name
      - name: Resolve PR context
        id: pr
        uses: actions/github-script@60a0d83039c74a4aee543508d2ffcb1c3799cdea # v7
        with:
          script: |
            let pr;
            if (context.eventName === 'issue_comment') {
              const resp = await github.rest.pulls.get({
                owner: context.repo.owner,
                repo: context.repo.repo,
                pull_number: context.payload.issue.number,
              });
              pr = resp.data;
            } else {
              pr = context.payload.pull_request;
            }
            core.setOutput('number', pr.number);
            core.setOutput('sha', pr.head.sha);
            core.setOutput('branch', pr.head.ref);
            core.setOutput('is_fork', String(pr.head.repo.full_name !== pr.base.repo.full_name));

      - name: Checkout PR head
        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
        with:
          ref: ${{ steps.pr.outputs.sha }}
          fetch-depth: 1

      # claude-code-action fetches branches by name from origin, which fails
      # for fork PRs. Create a temporary branch ref via the API so the action
      # can find it. Using the API (not git push) avoids the GITHUB_TOKEN
      # restriction that blocks pushing commits containing workflow file changes.
      # Use a prefixed temporary branch name to avoid overwriting real branches
      # (e.g. a fork branch named "main" would overwrite origin/main).
      - name: Create fork branch ref on origin
        id: push-fork
        if: steps.pr.outputs.is_fork == 'true'
        env:
          FORK_BRANCH: claude-tmp/fork-pr-${{ steps.pr.outputs.number }}
          FORK_SHA: ${{ steps.pr.outputs.sha }}
          GH_TOKEN: ${{ github.token }}
        run: |
          echo "FORK_BRANCH=$FORK_BRANCH" >> "$GITHUB_ENV"
          gh api "repos/${{ github.repository }}/git/refs" \
            --method POST \
            -f ref="refs/heads/$FORK_BRANCH" \
            -f sha="$FORK_SHA" \
          || gh api "repos/${{ github.repository }}/git/refs/heads/$FORK_BRANCH" \
            --method PATCH \
            -f sha="$FORK_SHA" \
            -F force=true

      - name: Run Claude Code Review
        id: claude-review
        uses: anthropics/claude-code-action@9469d113c6afd29550c402740f22d1a97dd1209b # v1
        with:
          claude_code_oauth_token: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}
          plugin_marketplaces: 'https://github.com/anthropics/claude-code.git'
          plugins: 'code-review@claude-code-plugins'
          prompt: '/code-review:code-review ${{ github.repository }}/pull/${{ steps.pr.outputs.number }}'

      # Clean up the temporary branch ref we created for fork PRs.
      # Only delete if the create step actually succeeded.
      - name: Delete fork branch ref from origin
        if: always() && steps.push-fork.outcome == 'success'
        env:
          GH_TOKEN: ${{ github.token }}
        run: gh api "repos/${{ github.repository }}/git/refs/heads/$FORK_BRANCH" --method DELETE || true