You are helping me build the following AI agent workflow.

## Goal
Uptime Monitoring With Scheduled Triggers: Every 5 minutes, checks a list of URLs in Google Sheets for uptime and alerts via Slack and email if any site goes down.

## Specification
- What it does: You get instant alerts on your Slack channel or email whenever a website listed in Google Sheets goes down. Every five minutes, the tool automatically checks your sites, logs their status back to the sheet, and notifies you immediately if any go offline so you can act fast.
- Trigger: On a schedule (Scheduled · every 5 minutes)
- Autonomy: Fully hands-off
- Expected setup effort: under an hour
- Tools/services involved:
  - Google Sheets: Storing website URLs and state logs
  - HTTP Request: Checking website availability status
  - Slack: Sending alerts for down websites
  - Gmail: Sending email alerts for down websites

## Known pitfalls, handle each one explicitly in your implementation
1. Slack API tokens can expire or lose permissions so verify webhook URLs and scopes regularly.
2. Google Sheets API quotas are strict so batch writes where possible to avoid hitting daily limits.

## Reference implementation
https://n8n.io/workflows/2327 (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/uptime-monitoring-with-scheduled-triggers/ via usecasesforagents.com