You are helping me build the following AI agent workflow.

## Goal
Service Package Recommendations: Routes leads by budget to the right service package, sends a formatted proposal email, logs data to your sheet.

## Specification
- What it does: You get leads automatically matched to the right service package based on their budget, receive a ready-to-send proposal email with case studies, and have all inquiry details logged in your tracking sheet without manual entry.
- Trigger: Triggered by an event (Event · on form submission)
- Autonomy: Fully hands-off
- Expected setup effort: about an afternoon
- Tools/services involved:
  - Google Sheets: Sales pipeline tracking and data logging
  - Gmail: Sending personalized proposal emails
  - Google Calendar: Scheduling follow-up reminders

## Known pitfalls, handle each one explicitly in your implementation
1. LLM outputs can vary in length so add a character limit check to ensure emails fit within Gmail's display preferences.
2. Budget parsing may fail if users enter currency symbols or text so sanitize inputs by stripping non-numeric characters before comparison.
3. Gmail API quotas are strict per user so implement a queue system to prevent hitting daily sending limits during high volume.
4. Calendar events might double-book if the lead already has a meeting at that time so add a conflict check before creating the reminder.

## Reference implementation
https://n8n.io/workflows/10699 (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-service-package-recommendations/ via usecasesforagents.com