| name | compute_group_price |
| description | Sum group entry prices deterministically from tickets + per-ticket headcounts. |
| when_to_use | After the user asked for a group total ("was kostet das für 2
Erwachsene + 2 Kinder?") and you've identified the right prices
(either from web_extract or the user typed them). DON'T do the
arithmetic in your head — call this skill. It also emits a nice
receipt-style card in the chat (price_summary ui_action).
Workflow:
1. From web_extract, identify the relevant tickets.
2. Ideally use the CLARIFY-BEFORE-CALCULATING rule first if the
price structure is ambiguous (state interpretation + ask).
3. Call compute_group_price with the matched items.
4. Reply with the total + offer a follow-up (e.g. "soll ich euren
Besuch eintragen?").
Example call:
compute_group_price(
items=[
{"label": "Erwachsene (Begleitperson)", "unit_eur": 5.90, "count": 2},
{"label": "Kind 7 Jahre", "unit_eur": 11.90, "count": 1},
{"label": "Kleinkind 0 Jahre", "unit_eur": 7.00, "count": 1}
],
title="Monkeytown Braunschweig",
source_url="https://monkeytown.eu/de/braunschweig/preise"
)
→ returns total=30.70, breakdown rendered as a receipt card.
Use this for ANY group-cost calculation — restaurants, museums,
sports clubs, transport tickets, anything. Not just admission.
|
| inputs | {"items":{"type":"array","required":true,"description":"List of {label, unit_eur, count} dicts — one per ticket category\nthe user actually needs. `unit_eur` is the per-person price\n(decimal number; \"5,90\" → 5.90). `count` is how many.\n"},"title":{"type":"string","required":false,"description":"Header shown on the price-summary card. Usually the venue or event name."},"source_url":{"type":"string","required":false,"description":"URL the prices were extracted from. Shown as the source on the card so the user can verify."},"currency":{"type":"string","required":false,"default":"EUR","description":"ISO 4217 (default EUR). Used for display only; math is always plain decimals."}} |
| outputs | {"total_eur":{"type":"number","description":"Sum of unit_eur × count across items, rounded to 2 decimals."},"line_items":{"type":"array","description":"Each input item augmented with subtotal_eur. Same order as input for the receipt."},"total_count":{"type":"integer","description":"Sum of `count` values across all items — the total head count."}} |
| permissions | ["admin","member","restricted"] |
| side_effects | Emits a `price_summary` ui_action that renders as an inline receipt-
style card in chat (line items + total). No DB writes.
|
| tags | ["math","prices","web"] |
compute_group_price
Tiny deterministic arithmetic helper. Two reasons it exists despite
being "just multiplication":
- LLM math is unreliable for anything past 3 line items. Especially
with comma-vs-dot decimals (German "5,90 €" vs English "5.90"). One
missed conversion and the total is off by 90 €.
- Receipt-style display in the chat is much friendlier than the
LLM listing them in prose. The price_summary card shows line items
- total + source URL + a "Save these prices to " button (so
the next time the user asks, it's instant).
