Buy It Cheaper

Supermarket Offer Watcher

Overview

Use this skill to maintain a local product watchlist and run recurring nearby-offer checks across supermarket chains.

Configurable after installation:

• Home location (text)
• Radius (km)
• Product list
• Check frequency (daily or weekly)
• Check time and timezone

Default data file:

• /data/workspace/data/supermarkt-watchlist.json

Quick setup

Run from the skill folder.

1. Initialize config:

python3 scripts/watchlist.py init --location "<ZIP CITY>" --radius-km 15 --mode daily --time 07:00 --tz Europe/Berlin

2. Add products:

python3 scripts/watchlist.py add "Senseo Coffee Pads" --aliases "Senseo Pads" --stores "REWE,EDEKA,Lidl,Aldi,Kaufland,Netto,Penny"

3. Inspect config:

python3 scripts/watchlist.py list

Manage configuration later

Update location/radius:

python3 scripts/watchlist.py set-home --location "00001 Berlin" --radius-km 20

Update schedule:

# daily at 07:00
python3 scripts/watchlist.py set-schedule --mode daily --time 07:00 --tz Europe/Berlin

# weekly on monday at 07:00
python3 scripts/watchlist.py set-schedule --mode weekly --weekday monday --time 07:00 --tz Europe/Berlin

Remove product:

python3 scripts/watchlist.py remove "Senseo Coffee Pads"

Offer-check workflow

1. Load watchlist config from /data/workspace/data/supermarkt-watchlist.json.
2. For each product, run 2–4 web_search queries (product + "offer/deal" + location + optional chain).
3. Open promising result pages using web_fetch.
4. Validate each hit before reporting:
   • Product (or alias) is explicit
   • Store/chain is clear
   • Date window is currently valid (today/in current week)
   • Price or discount is visible
5. Deduplicate same product/store/date combinations.
6. Send compact alert summary.

Alert format

Use this line format per valid deal:

✅ <Product> — <Store> — <Price/Discount> — valid until <Date> — <URL>

If no safe deals are found, send:

No reliable nearby offers found today.

Cron setup guidelines

Use cron.add with sessionTarget: "isolated" and payload.kind: "agentTurn".

• Daily cron expression: 0 7 * * *
• Weekly cron expression example (Monday): 0 7 * * 1
• Always set timezone from config (e.g., Europe/Berlin).

In the cron prompt, instruct the agent to:

• read watchlist config,
• run offer checks,
• report only validated deals.