Interactive vs. Automation Mode in the GitHub Action

Your team has two workflows using anthropics/claude-code-action@v1:

• Workflow A, triggered on issue_comment, with no prompt input in the with: block.
• Workflow B, triggered on a schedule cron, with prompt: "Summarize yesterday's merged PRs" in the with: block.

1. What determines which "mode" each workflow runs in, and what mode is each one in?
2. A teammate says Workflow A will "run for every comment on every issue." Is that accurate? What actually gates whether it responds?
3. Workflow B's summary currently only appears in the workflow run log, not as a comment anywhere. What would need to change for it to post somewhere visible, and why doesn't it do that by default?