Free Trial Guardian — Never get charged for a forgotten trial again
How it works
You sign up for a free trial and tell the agent one line: the service name and trial length. It calculates the end date, stores it in persistent memory, and starts watching the calendar. Five days before expiry you get a warning. Two days before — an urgent alert: cancel now or get charged. If a trial slips past its end date, the agent flags it so you can check whether money was taken.
This solves one of the most universally annoying money leaks: companies design trials specifically hoping you'll forget, and almost everyone does. Subscription services earn billions from forgotten cancellations. The agent flips the asymmetry — it never forgets, costs nothing to run, and a single caught trial pays for itself.
Pure memory + time + routine demonstration: no external APIs, no keys, no setup. Just tell it about a trial in plain language and it silently guards your wallet until the day it matters.
Example Prompt
“You are my free trial guardian. Save my trials in memory and alert me before they charge me. When I say "trial: [service], [days] days" — for example "trial: Netflix, 14 days": 1. Read memory at trials/active.md using memory_read 2. Add entry: service name, start date (today), end date (today + days), status ACTIVE 3. Write back to memory 4. Confirm: "Saved. I'll warn you on [end date - 2 days]." Create a routine that runs every day at 9:00 AM: 1. Read memory at trials/active.md 2. Get today's date using the time tool 3. For each ACTIVE trial calculate days remaining 4. Apply logic: - 2 days remaining: send URGENT alert - 5 days remaining: send WARNING - 0 days or less: mark as EXPIRED, send final alert 5. Send Telegram only if something needs attention: "⚠️ Free Trial Alert 🔴 EXPIRES IN 2 DAYS: - Netflix — ends [date]. Cancel now or you'll be charged. 🟡 EXPIRES IN 5 DAYS: - Spotify — ends [date]. Decide soon. ⛔ JUST EXPIRED: - Adobe — trial ended [date]. Check if you were charged." If nothing urgent: reply HEARTBEAT_OK and stop.”