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I have SP-API developer credentials for my own seller account. Help me build a small read-only MCP server in TypeScript that exposes: sales by ASIN for a date range, FBA inventory, open orders, catalog item details and settlement summaries. Handle token refresh, rate limits, pagination and async report polling. Pin every dependency version, keep credentials in environment variables, and don't add any write endpoints.

Here are my Inventory Ledger, FBA Inventory and Fee Preview exports [attach].
List SKUs with units that will be 181+ days old at the next 15th snapshot, the estimated surcharge, and whether a removal order by the 14th is cheaper.
Then list SKUs whose 30- and 90-day days of supply are both under 28 (low-inventory fee risk). Show every calculation.

Help me plan an in-house inventory planning tool before we build anything.
Stock locations: [3PLs] plus Amazon FBA in [marketplaces]. Demand sources: [website, Amazon, retail].
1. List the data feeds we need from each location and how often to pull them.
2. Propose ABC grouping rules and two forecast methods I can switch per product and channel.
3. Define red/amber/green alert rules from days of cover and lead time.
4. Design the reorder suggestion: respect MOQ and pallet quantities, and suggest 3PL-to-Amazon transfers separately from supplier orders.
5. POs are drafts only, for my approval in [accounting system].
Ask me for anything you need before you start.

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.

Here's the raw JSON from the FBA /fba/inventory/v1/summaries endpoint (pasted below). Write an ingest script that upserts sellerSku, asin, and the fulfillable/inbound quantities into a fba_inventory table, paginating on nextToken, capped at 20 pages. Never overwrite the cost column on the product table — COGS is entered manually and must survive a refresh.

From the FBA Inventory Ledger (summary and detailed), FC transfers and inventory reports I attach, build one table per SKU across all my marketplaces: starting balance, receipts, customer shipments, returns, transfers in/out, lost/damaged/found adjustments, ending balance and reserved/inbound quantities.
Then flag any SKU where units marked lost or damaged exceed units later found, or where the ending balance doesn't add up from the movements. Show the rows behind each flag.