Cheap#

Find the cheapest meaningful visible price for a product across major Chinese shopping platforms. Use when the user provides a product name and wants the lowest current visible price, the cheapest platform, or a quick cross-platform price comparison. Ask questions like "哪个最便宜", "哪里买最便宜", "帮我比价", "全网找最低价", "哪个平台便宜", "哪里下单最划算", or "帮我找最低价".

Usage Scenarios#

Scenario 1: Cross-Platform Price Comparison#

User input: "帮我比价小米手环 8 Pro，哪个平台最便宜？" Expected output: The skill searches across Taobao, Tmall, JD.com, Pinduoduo, and other relevant platforms. Compares like-for-like listings (same model, specs, bundle). Returns: Cheapest Found (platform and price), Comparable Options with prices on other platforms, Match Confidence (whether listings look like the same product), Caveats (variant match, coupon pricing, shipping), and Final Advice.

Scenario 2: Ambiguous Product Name#

User input: "哪里买 iPhone 最便宜？" Expected output: The skill identifies the product as too broad (iPhones have many models), asks one short clarifying question: "您具体想看哪个型号？比如 iPhone 15 Pro, iPhone 15, 还是 iPhone 14？不同型号价格差异很大。" Then proceeds with the comparison once clarified.

Scenario 3: Price-Limited Mode (Weak Results)#

User input: "帮我找这款小众耳机的全网最低价，只有一个淘宝店在卖" Expected output: The skill attempts cross-platform search. If only one platform has this product (Price-limited mode), switches to Mode 2. Outputs: Current Best Signal (the single available price), Why No Strong Cheapest Claim (product too niche for cross-platform comparison), What Remains Unverified (whether other platforms may have it at different prices), and Final Advice with cautious conclusion.

Scenario 4: 想买便宜机票#

User input: "想去成都玩几天，从深圳出发，怎么买机票最便宜？什么时候买最划算？" Expected output: 推荐比价策略：同时查去哪儿、携程、飞猪、航司官网（如南航、深航）的价格，注意含税总价。建议提前3-4周购票，选中周三/周四出发。使用各平台的'低价日历'和'预约提醒'功能。给出深圳到成都的近期待票价区间参考，并建议关注航司会员日（如南航每月28号）。

Workflow#

1. Identify the product.
   • Accept a product name.
   • If the product is too broad or ambiguous, ask one short clarifying question for the most decision-relevant detail, such as brand, model, size, or key variant.
2. Check price accessibility.
   • Search across relevant Chinese platforms.
   • Decide which mode applies:
     • Mode 1 if enough visible price evidence is accessible and comparable.
     • Mode 2 if platform access, listing clarity, or price conditions are too weak for a strong cheapest-price claim.
3. If Mode 1, compare meaningful prices.
   • Prefer Taobao, Tmall, JD.com, Pinduoduo, and other clearly relevant platforms.
   • Use only currently visible price evidence.
   • Match comparable listings by brand, model, specs, quantity, version, and bundle contents.
   • Distinguish straightforward visible price from coupon-only, member-only, deposit/pre-sale, bundle-distorted, or variant-mismatched prices.
4. If Mode 2, do not fake precision.
   • State that the currently accessible evidence is too weak for a strong cheapest-price claim.
   • Explain whether the issue is platform access, weak product matching, or distorted price conditions.
   • Give only a limited conclusion when still useful.
5. Give the result. Cover:
   • cheapest platform or listing found when supportable
   • visible price evidence actually available
   • comparable alternatives when supportable
   • matching confidence
   • any caveats about variants, bundles, coupons, seller trust, or access limits

Output#

Use this structure unless the user asks for something else.

Mode 1 output#

Use when enough price evidence is accessible.

Cheapest Found

State the lowest meaningful visible price found and on which platform.

Comparable Options

List the main comparable prices found on other platforms.

Match Confidence

State whether the compared listings look like the same product:

• High
• Medium
• Low

Caveats

State any important risks, such as:

• unclear variant match
• bundle differences
• coupon or membership pricing
• deposit or pre-sale pricing
• seller quality concerns
• incomplete platform access

Final Advice

Give a direct buying suggestion in plain language.

Mode 2 output#

Use when accessible evidence is too weak for a strong lowest-price claim.

Current Best Signal

State the weakest still-usable price clue, if any.

Why No Strong Cheapest Claim

Explain whether the issue is:

• platform access limits
• weak listing comparability
• unclear price conditions
• incomplete platform coverage

What Remains Unverified

State what cannot yet be confirmed.

Final Advice

Give a cautious conclusion without pretending a definitive lowest price was found.

Quality bar#

Do:

• compare like-for-like listings
• say when the cheapest visible option may not be the best option
• distinguish real low price from misleading low price
• be explicit when matching confidence is weak

Do not:

• compare different variants as if they were the same item
• treat coupon-only or pre-sale prices as normal prices without warning
• claim full-market coverage when platform access is incomplete
• invent prices or listing details

Limitation handling#

If the product is too ambiguous:

• ask one short clarifying question

If platform access is incomplete:

• switch to Mode 2 unless a narrower Mode 1 comparison is still supportable
• say which platforms were actually checked
• avoid claiming a definitive all-platform lowest price
• do not present a partial platform scan as a full-market cheapest-price result

If listing comparability is weak:

• lower confidence
• explain what may not match cleanly

If the visible lowest number depends on unclear conditions:

• do not present it as the straightforward cheapest option without warning