You are helping me build the following AI agent workflow.

## Goal
Screen And Schedule Recruitment Interviews On WhatsApp: Receives candidate applications via WhatsApp, screens them with AI against job criteria, and books interviews directly into Google Calendar.

## Specification
- What it does: You receive candidate applications directly on WhatsApp, where an AI screens them against your job criteria to filter out unqualified applicants instantly. Qualified candidates get immediate interview offers with slots automatically booked into your Google Calendar, while every interaction is logged in Google Sheets for easy tracking.
- Trigger: Triggered by an event (Event · on new WhatsApp message)
- Autonomy: Fully hands-off
- Expected setup effort: about an afternoon
- Tools/services involved:
  - Twilio WhatsApp Business API: WhatsApp messaging channel
  - OpenAI Chat Model: Candidate screening and logic processing
  - Google Calendar API: Checking availability and booking slots
  - Google Sheets: Logging interactions and tracking status

## Known pitfalls, handle each one explicitly in your implementation
1. Timezone mismatches between user input and server time cause scheduling errors so always normalize timestamps to UTC before calendar creation.
2. Google Calendar API conflicts may arise if slots are double-booked so verify slot availability before committing the event.

## Reference implementation
https://n8n.io/workflows/15620 (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/screen-and-schedule-recruitment-interviews-on-whatsapp/ via usecasesforagents.com