Price History Checker

What it does

Verdict: WAIT: hits $149 every Black Friday.

Price history:
- Current: $199 | 90-day average: $219
- Historical low: $149 (Nov 2025)
- Pattern: drops to $149–159 each November

Caveat: none, 18 months of history.

What this one touches

Reads public product and price-history pages only. Writes the verdict to you and nothing else. Never buys anything or signs you up for trackers.

Install

Copy this block and paste it into your Muse chat. Muse does the install and confirms when it's done.

Full source

This is the exact text Muse installs. Read it. That's the whole trust model.

---
name: price-history-checker
description: Answer "is this a good price?" from price history, not the strikethrough, historical low, average, and whether to buy now or wait. Trigger phrases: "is this a good price", "should I buy this now", "check the price history".
---
# Purpose

Strikethrough prices lie. This skill checks what an item has
actually sold for over time and gives a buy-now-or-wait
verdict grounded in that history.

# Workflow

1. Ask the user for the product link or exact model name.
2. Find price history: camelcamelcamel-style trackers for
   Amazon items, manufacturer price pages, and recent sold
   listings for marketplace items.
3. Record: current price, 90-day average, historical low and
   when it hit it, and any predictable sale pattern (Prime
   Day, Black Friday, model refresh).
4. Verdict rules:
   - At or near historical low: "buy"
   - Within 10% of average with no pattern: "fair: buy if
     you need it now"
   - Above average with a known sale window within 60 days:
     "wait"
5. Report in the Output Contract shape.

# Output Contract

- Verdict: buy, fair, or wait, one word, then one line why
- Price history: current, 90-day average, historical low
  (with date), sale pattern if any
- Caveats: thin history, refurbished vs. new mismatch, or
  regional pricing differences

# Operating Rules

- History comes from trackers and sold listings, not from
  the merchant's "was" price. Say the source.
- "Wait" needs a reason: a dated sale window or a pattern,
  not vibes.
- Thin history gets a caveat, not a confident verdict.
- Read only. Never buy, never sign up for price trackers.

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• Return Window Tracker

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  Tested in Museskillinstructionsworkflowreturn-ledger

  by Muse Skills editors · Written for this directory

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• Out-the-Door Cost Comparator

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  by Muse Skills editors · Written for this directory

  ViewCopy install promptInstall the "Out-the-Door Cost Comparator" skill. Its full source is below. Create it at ~/workspace/skills/out-the-door-cost-comparator/SKILL.md following skill-creator conventions (name and description frontmatter; Purpose, Workflow, Output Contract, Operating Rules sections). Then confirm it is installed and tell me the trigger phrases. --- SOURCE --- --- name: out-the-door-cost-comparator description: Compare the true out-the-door cost of the same item across stores, adding tax, shipping, and fees to each price before ranking. Trigger phrases: "compare out the door price", "which store is cheapest all in", "total cost comparison". --- # Purpose Compare the true out-the-door cost of the same product across stores, adding sales tax, shipping, handling fees, and discounts to each price before ranking. A lower sticker price can lose once delivery and tax are included, so this skill recomputes each offer as a single total using the same shipping destination and delivery speed, then ranks stores by that total. # Workflow 1. Get the product description or link, the stores to compare, and the shipping ZIP code. 2. For each store, capture: item price, any discount or coupon applied, shipping cost, handling or service fees, estimated sales tax, and the delivery window. 3. Normalize to one delivery speed. If one store ships slow for free and another charges for fast, compare the speed the user picks, not mismatched speeds. 4. Compute the total per store: price minus discounts, plus shipping, plus fees, plus tax. 5. Rank stores by total cost, cheapest first, and show the dollar gap to the next cheapest option. 6. Flag caveats that change the effective deal: final-sale items, restocking fees, return shipping charges, or store credit quirks. # Output Contract A short table, one row per store, with these columns: Store, Item price, Shipping, Tax, Total, Delivery window. Below the table, one line naming the cheapest total and the savings versus the most expensive option. Keep it to the table plus the one-liner; no essay. # Operating Rules - Never assume tax or shipping. Look it up for the user's ZIP at checkout when possible, or state the assumption plainly. - Never compare mismatched delivery speeds. Normalize first. - Never invent a coupon. Only apply codes the user provides or that appear on the store's own page. - Never buy anything. This is a comparison job only. - If a store's final fees appear only at checkout, say so and label the total as estimated.