Running Claude in CI: A GitHub Actions + Claude Code SDK Auto-PR-Reviewer That Costs $0.03 per Review (opens in new tab)

⚠️ この記事はアフィリエイト広告（プロモーション）を含みます。リンク先で発生した収益の一部が運営者に支払われますが、読者の購入価格には一切影響ありません。 By the end of this article you will have a GitHub Actions workflow that, on every pull_request, runs the Claude Code SDK headlessly, reads only the diff, and posts inline review comments via the GitHub API. I'll show the exact YAML and Python that run in my own repos, the token math that keeps each review at roughly $0.03, and the three failures that cost me a weekend before it worked. Why I stopped piping the full...