You are helping me build the following AI agent workflow.

## Goal
Webinar Onboarding and Verification: Validates new webinar signups in real time, generates a personalized PDF welcome kit with AI.

## Specification
- What it does: You instantly validate new webinar signups to filter out fake registrations while generating a personalized PDF welcome kit for each attendee. This process automatically stores verified data in your spreadsheet and sends the customized materials via email, ensuring high-quality first impressions without manual work.
- Trigger: Triggered by an event (Event · on new webinar signup)
- Autonomy: Fully hands-off
- Expected setup effort: about an afternoon
- Tools/services involved:
  - Gmail: Sending personalized welcome emails and kits
  - Google Sheets: Storing verified attendee data
  - OpenAI: Generating personalized welcome messages and content
  - Google Drive: Creating PDF welcome kits from HTML templates

## Known pitfalls, handle each one explicitly in your implementation
1. LLM outputs can vary in length which may break fixed-width PDF layouts so add a character limit filter before generation.
2. Gmail API quotas reset daily so batch send emails during off-peak hours to prevent hitting the 500-email daily cap.
3. Personalization tokens might fail if user data is missing so add a fallback message for incomplete profiles.

## Reference implementation
https://n8n.io/workflows/11730 (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-webinar-onboarding-and-verification/ via usecasesforagents.com