You are helping me build the following AI agent workflow.

## Goal
Supplier Quote Requests and Follow-ups: Automates supplier quote requests, extracts pricing from attachments via AI.

## Specification
- What it does: Eliminate manual data entry in procurement by automating the entire supplier quote lifecycle. The system sends personalized email requests, monitors for replies, uses AI to extract pricing and product details from attachments, and automatically follows up with non-responsive suppliers via WhatsApp or email. This reduces a 5-hour process to a 10-minute review task while improving response rates.
- Trigger: On a schedule (Manual · on demand; Scheduled · hourly and daily)
- Autonomy: Fully hands-off
- Expected setup effort: about an afternoon
- Tools/services involved:
  - Gmail: Sending quote requests and monitoring replies
  - Google Sheets: Tracking supplier data and storing extracted prices
  - OpenAI Chat Model: Extracting product details from PDF attachments
  - Twilio: Sending WhatsApp follow-up reminders

## Known pitfalls, handle each one explicitly in your implementation
1. Supplier PDFs often have inconsistent layouts so add robust error handling and human review steps for ambiguous extractions.
2. Twilio WhatsApp messages require pre-approved templates in some regions, so verify compliance requirements before launching the campaign.
3. Personalization tokens might fail if supplier data is missing in Sheets, add validation checks to skip incomplete records.

## Reference implementation
https://n8n.io/workflows/12638 (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/automate-supplier-quote-requests-and-follow-ups/ via usecasesforagents.com