diff --git a/.github/workflows/claude-review.yml b/.github/workflows/claude-review.yml
index eb418be..5fff379 100644
--- a/.github/workflows/claude-review.yml
+++ b/.github/workflows/claude-review.yml
@@ -41,6 +41,10 @@ jobs:
       - name: Claude review
         uses: anthropics/claude-code-action@v1
         with:
+          # action.yml defines anthropic_api_key as a `with:` input — the
+          # action's env validation checks the input, not the env var. The
+          # README's env-only example is incomplete for v1.
+          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
           prompt: |
             You are reviewing a pull request in moose-lab/DevLog, a TypeScript /
             Next.js 16 / Bun developer-tools project (CLI + dashboard for Claude