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Resale sales record for the tax year

Turns a year of secondhand sales across several marketplaces into one tidy record. It splits personal clear outs from trading, totals sales, fees, postage and stock per platform, and compares the trading allowance with your real costs.

Ecommerce and resaleWorks with Custom GPTs · Claude Desktop with MCP+2Community example

What it does

  • Reads your sales exports from each marketplace
  • Splits personal clear out sales from trading
  • Totals sales, fees, postage and stock per platform for the tax year
  • Compares the trading allowance with your actual costs
  • Lists the dates that apply and what to check on the official site

Your approval boundaries

Approval required

These actions always wait for your yes:

  • Anything you file or send to the tax office
  • Any figure you rely on, check it against the platform export

You decide what happens next.

More about this workflow

This setup is for online sellers and resale shops juggling listings, orders and buyers. It takes a repeat chore off your plate and hands back something you can check quickly.

First, it reads your sales exports from each marketplace. Next, it splits personal clear out sales from trading. Then it totals sales, fees, postage and stock per platform for the tax year. After that, it compares the trading allowance with your actual costs. Finally, it lists the dates that apply and what to check on the official site. It works with your marketplace data and spreadsheets, each on its own login with limited access.

You get the prep work done and waiting for you. The agent stops and asks for your yes before anything you file or send to the tax office and any figure you rely on, check it against the platform export, and says plainly if a step cannot be undone.

“The assistant drafts and you decide”
polytheseus (run by dcs127) polytheseus on GitHub · Oct 25, 2026
Before you startMarketplace data · Spreadsheets accessScoped permissionsCustom GPTs or Claude Desktop with MCP
Explore required tools and model recommendations

Tools and access

  • eBay

    Handles the marketplace data part of this job. Grant read scopes for orders and listings.

    API required: Yes. Needs an eBay developer account and an app keyset. Seller actions use OAuth tokens with the scopes you grant.

  • Google Sheets

    Handles the spreadsheets part of this job. Grant access to the single sheet it needs.

    API required: Yes. Needs a Google Cloud OAuth app or a service account with the Sheets API turned on.

Official links only. Not sponsored, no affiliate links.

Model recommendations

Best pick

Gemini 3.8 Flash

Built for agent workflows, with a free tier to test on.

$0.75 per million input tokens and $3.75 per million output tokens through December 31, 2026. $1.50 and $7.50 from January 1, 2027.

Google docs as of October 11, 2026

Cheaper backup

Gemini 3.5 Flash-Lite

Low cost for many listings at once.

$0.30 per million input tokens, $2.50 per million output tokens.

Google docs as of October 11, 2026

Our own picks. Not sponsored, no affiliate links.

Build your prompt

Add your details, then copy the prompt into your tool.

1Your details

Fill these in and the prompt updates as you type.

one per platform

the rules are written for the UK

2Your prompt

4 of 4 still empty
Fill these in before you run it: [SALES EXPORTS: one per platform] [TAX YEAR] [WHICH ITEMS WERE PERSONAL CLEAR OUTS] [COUNTRY: the rules are written for the UK] You are the Resale sales record for the tax year agent. Turns a year of secondhand sales across several marketplaces into one tidy record. It splits personal clear outs from trading, totals sales, fees, postage and stock per platform, and compares the trading allowance with your real costs. Use only the details filled in above. If any [BRACKETED] item is still blank or unclear, stop and ask for it first. Do not guess. What you do on your own: - Reads your sales exports from each marketplace - Splits personal clear out sales from trading - Totals sales, fees, postage and stock per platform for the tax year - Compares the trading allowance with your actual costs - Lists the dates that apply and what to check on the official site What you must never do without a yes from a person: - Anything you file or send to the tax office - Any figure you rely on, check it against the platform export Rules: - Before any step on the list above, stop and ask. Say in plain words what you want to do, who it affects, and whether it can be undone. - If something cannot be undone, say so first, in one short line. - Write drafts, not final actions. A person sends, pays, posts, or deletes. - Keep a short log of every action you took and every source you read. - If you are unsure, ask instead of guessing.
View run instructionsPaste into: Custom GPTs, Claude Desktop with MCP, Claude Code, Cursor

Your answers stay in this browser only.

Run your workflow

Connect your tools with only the access this setup needs, then follow these steps.

Steps

Do these in order. Test on old data before it touches live work.

  1. 1Connect eBay with its own login, not yours. Grant read scopes for orders and listings.
  2. 2Connect Google Sheets with its own login, not yours. Grant access to the single sheet it needs.
  3. 3Paste the prompt where your harness takes instructions. See the note under the Copy button.
  4. 4Do a dry run on old or test data first. Check every draft and every stop point by hand before you let it near live work.
  5. 5Read its log after the first real run. Only widen access once a week of runs looks clean.

Safeguards and trust score

The score describes this example setup’s access, approval boundaries, ability to undo changes, and scope.

Access18 / 30

Can draft things that send or spend, so it sits close to risky actions.

Human approval30 / 30

Waits for a yes on: anything you file or send to the tax office, any figure you rely on, check it against the platform export.

Undo and logs14 / 20

Proposes changes to live records, so the setup needs a change log and a way back.

Scope18 / 20

Runs on its own login across 2 tools. Fewer connections means a smaller blast radius.

How to raise it

  • Access: Take away its ability to send, post or spend. Let it only write drafts, and have a person press send or pay from their own account +6
  • Undo and logs: Stop it from editing live records. Have it write the change as a proposal you apply, and keep a log of every change with a way to roll it back +3
  • Scope: Run it on one tool only, with its own login that can see just what this job needs +2

Do all of these to reach 91, up from 80.

Want help getting there? Get an AI Trust Audit from Pixeldesigns

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