SP-API MCP Server Built with Claude Code

Help me build a small local web app with Claude Code that shows, for today and the last 30 days: units and ordered sales per ASIN, Amazon fees, ad spend, and profit before and after cost of goods. Read data from my own SP-API and Amazon Ads API credentials (read-only), take COGS from a CSV I keep, and mark any number that is still an estimate. Don't add any feature that changes anything in Amazon.

Act as my Amazon store operator. Each week:
1. Audit: pull sales, sessions, conversion and ad data per ASIN for the last 7 days vs the 4 weeks before. List the 5 biggest problems with numbers.
2. Fix: for each problem, propose one specific change (listing text, bid, budget, negative keyword). Record today's baseline for the metric it should move.
3. Measure: check last week's changes against their baselines and say which helped, which didn't, and what to roll back.
Wait for my approval before making any change.

For brand [X]: starting cash $[ ] plus Amazon's pending balance $[ ].
Using my projected monthly unit sales and reorder dates [paste], unit cost, freight per unit and payment terms ([30]% deposit at order, rest on completion), estimate monthly cash in (after referral, fulfillment, storage and returns) and cash out for the next 12 months.
Tell me the most I can distribute today while keeping cash above $[buffer] every month. Show the table and your fee assumptions.

Every morning at 8am, for each of my brands' Seller Central accounts, check: Account Health rating and any new policy warnings; any new sellers on my brand's ASINs (possible hijackers); stranded inventory; suppressed or inactive listings. Post one Slack message per brand with only what changed since yesterday, marked [urgent] or [FYI], and a link to the Seller Central page for each item.

SOP: Open my Buy Sheet (Google Sheet). For each row added since [date] with status "Purchased", go to InventoryLab → Inventory → Replenish, search the ASIN, and create a replen line with quantity = Qty column and buy cost = Unit Cost column. Mark the row "Entered in IL" in the sheet. If an ASIN isn't found, skip it and add it to a list. Don't submit any shipment. Report every line you created.

I'm an Amazon FBA seller doing retail arbitrage. The folder [folder] has photos of one receipt batch.
1. Read every receipt. For each item give store, date, item title, quantity and unit cost (include tax if it's on the receipt). Mark any line you can't read clearly instead of guessing.
2. Match each item to an ASIN and show me the match before listing anything.
3. After I approve, create the listings, then reconcile my quantity on hand against the receipt totals and flag any mismatch.
4. Add one row per item to my Google Sheet: date, item title, COGS, quantity, ASIN.
5. Draft the FBA shipping plan for the items I mark as prepped and packed. Don't submit it until I say so.