Promotion Engine

Retail promotion calculator and discount lookup for digital employees. Computes final prices after applying discounts, bundles, thresholds, and membership tiers. Answers questions about current promotions and calculates how much a customer saves. Use when someone asks about: 优惠, 活动, 折扣, 满减, 打折, 赠品, 积分抵扣, 会员价, 怎么算, 最便宜怎么买, current promotions, any discounts, how much off, coupon, promo code, bundle deal, buy one get one.

Overview

This skill looks up active promotions and calculates final prices. It always shows its work (calculation steps) so customers trust the answer.

Depends on: promotions[] in knowledge base + membership{} config.

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Query Types

Query	Example	Action
"What promotions are active?"	"现在有什么活动？"	List all active promos
"How much will I pay?"	"买两件怎么算？"	Calculate total
"Is this on sale?"	"这款打折吗？"	Check promo applicability
"How do I get the best deal?"	"怎么买最划算？"	Optimize purchase strategy
"Can I stack promos?"	"会员折扣和满减可以一起用吗？"	Check stackability

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Calculation Steps

Always show calculation steps. Customers distrust "magic numbers."

Step 1: Identify applicable promotions

For each item in the cart/query:

1. Check promotions[] for active promos (not expired)
2. Filter by applicable_to scope (does this product qualify?)
3. Check excluded list (is this product excluded?)
4. Check membership tier for additional discounts

Step 2: Apply promotion rules

Use scripts/calculate_promotion.py for accurate computation.

Promotion types:

Type	Rule format	Example
threshold	满X减Y	满300减50
discount	X折 or X% off	8折, 20% off
bundle	买X件享Y价	买2件第2件半价
gift	满X赠品	满200赠小样
member_price	会员专属价	VIP价¥199

Step 3: Handle stacking

Check stackable field on each promotion.

• stackable: true → can combine with others
• stackable: false → use highest-value single promo
• When in doubt: use the rule that benefits the customer more

Step 4: Present result

Show original price → applicable promos → final price → total savings.

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Answer Format

Single item query

这款连衣裙 原价：¥399
✨ 夏日大促：满300减50
会员折扣：9折（VIP专享）

最终价格：¥309（节省¥90）

Cart calculation

您的购物清单：
  白色连衣裙 ×1   ¥399
  条纹衬衫   ×1   ¥259
  小计：¥658

✨ 满300减50 → -¥50
✨ 满600再减80 → -¥80（两件合计超过600！）

最终合计：¥528（节省¥130 🎉）

No active promotions

目前[产品/全场]暂无特别优惠活动。
当前售价：¥[price]

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Edge Cases

Conflicting promos: Always apply the rule that benefits the customer most. State which was applied.

Expired promo mentioned by customer: "这个活动已于[date]结束了，目前[有/没有]新的优惠。"

Promo not in KB but customer claims it exists: "我目前没有查到这个活动的信息，建议向店员确认一下，以免信息有误。"

Membership tier unknown: "您的会员等级我暂时查不到，建议核实后，会员专属折扣会自动应用。"

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Script

Use scripts/calculate_promotion.py for accurate numeric calculation. Reference: promo-rules-guide.md — detailed rule parsing.