You are helping me build the following AI agent workflow.

## Goal
SEO Guest Post Generator: Pulls pending guest post topics from a sheet, merges them with brand guidelines.

## Specification
- What it does: You get SEO-optimized guest post articles automatically written by an AI using your brand guidelines and topics from Google Sheets. The system saves each new draft to a separate sheet and updates the original row so you never generate duplicates twice.
- Trigger: Run manually (Manual · on demand)
- Autonomy: Fully hands-off
- Expected setup effort: about an afternoon
- Tools/services involved:
  - Google Sheets: Storing planning data and results
  - OpenAI Chat Model: Generating guest post content
  - Gmail: Sending notifications

## Known pitfalls, handle each one explicitly in your implementation
1. SEO keywords might be stuffed unnaturally so add a constraint in the prompt to prioritize readability over keyword repetition.

## Reference implementation
https://n8n.io/workflows/7666 (workflow template)
Fetch and inspect this before building. If it matches my stack, adapt it;
if not, rebuild the pattern with my tools.

## Process requirements
1. Before building: ask me which of the listed tools I actually use and
   what my platform is (n8n / Make / code / other). Do not assume.
2. Adapt the pattern to my answers; do not force the reference stack.
3. Address every pitfall above; tell me how you handled each.
4. Provide a test plan I can run before letting this touch real data.
5. Ask before any step that sends messages, modifies data, or spends money.

Source: https://usecasesforagents.com/use-case/automated-seo-guest-post-generator/ via usecasesforagents.com