Amazon Specialist
by
Weekly ASIN review for ecommerce teams: compute what each listing actually earns after Amazon's fees, then set scale, cut or fix.
Amazon reporting shows revenue and ad spend and leaves the rest of the cost stack somewhere else. Referral fees, fulfillment fees, storage, long-term storage, returns processing and the ad spend that only sometimes appears in the same view. An ASIN can look like a solid performer in Seller Central and be losing money once the whole stack is assembled, and the ones that do this are usually the heavy or slow-moving items where storage quietly accumulates. This skill computes what each listing actually earns after every fee and sets scale, cut or fix.
What It Does
- Assembles the full fee stack per ASIN including storage and returns processing.
- Computes contribution per unit after fees, ad spend and product cost.
- Finds the ASIN whose storage cost is eating its margin.
- Separates a listing problem from a product economics problem.
- Checks buy box share before recommending more spend.
- Sets scale, cut or fix per ASIN, with the contribution behind it.
Use Cases
- Find the ASIN losing money once storage is counted.
- Stop advertising a listing that cannot be profitable at any spend.
- Separate a fixable listing from a product that does not work here.
- See true contribution per ASIN rather than revenue.
Example Session
Which ASINs should we scale, cut or fix this week?
Your top revenue ASIN is your worst contributor. Storage is why.
- ASIN | Revenue | Fees and ads | Storage | Contribution | Action
- Jacket, navy | $41,000 | $16,400 | $4,900 | -$1,100 | Cut, too bulky
- Tee, black | $28,000 | $9,800 | $310 | $6,900 | Scale
- Cap, charcoal | $12,000 | $4,600 | $190 | $3,100 | Scale
- Hoodie, oatmeal | $19,000 | $8,100 | $2,200 | $400 | Fix listing first
The jacket sells best and loses money, because it is bulky enough that fees and storage together take more than half the revenue before product cost. That is a product economics problem rather than a listing problem, and no optimization fixes it. The hoodie is different: its contribution is thin because the listing converts badly, and a better main image and bullet set is the cheaper intervention.
Why This Beats Prompting It Yourself
Seller Central Revenue vs The Full Fee Stack: The Hidden Risk
A generic prompt reads the revenue and ad spend that Amazon puts in front of you and concludes the top seller is working. Referral, fulfillment, storage and returns processing sit in four different reports, and assembling them is the whole job. An ASIN can be negative and look like your best performer.
When You Still Need Listing Told Apart From Economics
Two ASINs with thin contribution need opposite responses. The jacket is structurally unprofitable on this channel because of its dimensions, and optimizing the listing is wasted effort. The hoodie has sound economics and a bad listing. Getting that distinction wrong costs either a month of work or a year of losses.
Known Limitations
Long-term storage fees are charged in arrears and are attributed to the period they accrued rather than the period billed, which makes recent months provisional. Fee schedules change and the skill uses the schedule you have loaded, so a rate change needs updating. It sets the per-ASIN action and does not change anything in Seller Central.
Install It
- Download the ZIP.
It is free and there is no account to create. - Unzip it into your agent's skills folder.
Claude Code reads ~/.claude/skills/, which is hidden by default: the command in the folder block opens it. Other agents scan their own directory, so drop the same folder there instead. - Ask your agent to use it.
Restart the agent if it was already running, then it picks the skill up with no config.
skills folder
Copy
~/.claude/skills/amazon-specialist/
SKILL.md
references/fee-stack.md
weekly/
# one file per week, with contribution per ASIN
# macOS: create the folder and open it in Finder
mkdir -p ~/.claude/skills && open ~/.claude/skills
# Windows: paste in the Explorer address bar
%USERPROFILE%\.claude\skills\Frequently asked questions
How is this different from Amazon's own reporting?
Amazon reports each fee category separately and none of them together with your product cost. This assembles the full stack per ASIN, subtracts your cost and ad spend, and returns contribution, which regularly reverses the ranking Seller Central shows.
Which agents does the skill run in?
Any agent that supports the open SKILL.md format: Claude Code, Cursor, Codex CLI, GitHub Copilot, Gemini CLI, Manus, Grok and others load it unmodified. The format is portable, the location is not. Each agent scans its own skills directory, so you drop the same folder into whichever one yours uses. There is no config file to edit and no API key to provision.
What does it need connected to work?
Seller Central settlement data, fee schedules, product cost, ad spend by ASIN, and storage reports. Dimensional data on products helps explain why a fulfillment fee is what it is.
Why cut a top selling ASIN?
Because volume at negative contribution makes the problem larger rather than smaller. The jacket's dimensions put it in a fulfillment tier that takes too much of the price, which is a fact about the product and this channel, not something a listing change affects.
What counts as a fixable listing?
One whose economics work and whose conversion is below comparable listings: a weak main image, thin bullets, missing attributes, or few reviews. The skill distinguishes these from products whose cost structure rules them out on this channel.
What is included with the skill?
The skill itself, the fee stack reference, the weekly action format, and the contribution model. It is free and security scanned. We re-publish the ZIP when fee schedules change, so download it again if your contributions start shifting.
Scale, cut or fix needs margin after Amazon's fees.
Polar carries fees, returns and product cost into contribution margin per ASIN, so the call you write to Notion survives the P&L.
<script type="application/ld+json">{"@context":"https://schema.org","@type":"FAQPage","mainEntity":[{"@type":"Question","name":"How is this different from Amazon's own reporting?","acceptedAnswer":{"@type":"Answer","text":"Amazon reports each fee category separately and none of them together with your product cost. This assembles the full stack per ASIN, subtracts your cost and ad spend, and returns contribution, which regularly reverses the ranking Seller Central shows."}},{"@type":"Question","name":"Which agents does the skill run in?","acceptedAnswer":{"@type":"Answer","text":"Any agent that supports the open SKILL.md format: Claude Code, Cursor, Codex CLI, GitHub Copilot, Gemini CLI, Manus, Grok and others load it unmodified. The format is portable, the location is not. Each agent scans its own skills directory, so you drop the same folder into whichever one yours uses. There is no config file to edit and no API key to provision."}},{"@type":"Question","name":"What does it need connected to work?","acceptedAnswer":{"@type":"Answer","text":"Seller Central settlement data, fee schedules, product cost, ad spend by ASIN, and storage reports. Dimensional data on products helps explain why a fulfillment fee is what it is."}},{"@type":"Question","name":"Why cut a top selling ASIN?","acceptedAnswer":{"@type":"Answer","text":"Because volume at negative contribution makes the problem larger rather than smaller. The jacket's dimensions put it in a fulfillment tier that takes too much of the price, which is a fact about the product and this channel, not something a listing change affects."}},{"@type":"Question","name":"What counts as a fixable listing?","acceptedAnswer":{"@type":"Answer","text":"One whose economics work and whose conversion is below comparable listings: a weak main image, thin bullets, missing attributes, or few reviews. The skill distinguishes these from products whose cost structure rules them out on this channel."}},{"@type":"Question","name":"What is included with the skill?","acceptedAnswer":{"@type":"Answer","text":"The skill itself, the fee stack reference, the weekly action format, and the contribution model. It is free and security scanned. We re-publish the ZIP when fee schedules change, so download it again if your contributions start shifting."}}]}</script>