diff --git a/.github/workflows/preview-deploy.yml b/.github/workflows/preview-deploy.yml
index 2c0f555153..a1bc528896 100644
--- a/.github/workflows/preview-deploy.yml
+++ b/.github/workflows/preview-deploy.yml
@@ -167,6 +167,8 @@ jobs:
         uses: anthropics/claude-code-action@c0949c50a78c1ec8ce2647db36629b870e715d0c # v1
         with:
           claude_code_oauth_token: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}
+          # Currents trial: print the agent's messages so a failed run shows why.
+          show_full_output: true
           github_token: ${{ github.token }}
           # Fork authors lack write access; the agent has only browser tools and a read-only token.
           allowed_non_write_users: "*"