Split Expenses

An agent skill for Claude, ChatGPT & Codex

You talk.
It does the math.
Everyone’s even.

Send your assistant the receipt, or just say who paid. It keeps the group’s balances in the chat and settles up in the fewest payments.

Download the skill ZIP · 6 KB Read the source
  • No app to join
  • No account
  • No server
  • MIT

01 In conversation

Just say what happened.

No forms, and nothing for your friends to install. Drop in the receipt, say who shared what, and the table comes back updated. It always sums to zero.

A receipt photo and a sentence become a balanced ledger A photo of a receipt totalling 124 euro is attached and read, next to a plain-language message — Brand paid for dinner, the wine was just two of them, split the food with Cooper. It becomes two line items: wine at 32 euro shared by Brand and You, and food at 92 euro shared by all three. The balances that follow are You at minus 46.67, Brand at plus 77.33, and Cooper at minus 30.66, drawn as bars either side of a zero axis whose two halves are equal, and summing to zero. PARIS · EUR 3 PEOPLE RECEIPT PHOTO €124.00 Brand paid for dinner. The wine was just us two — split the food with Cooper. LINE ITEMS TOTAL 124.00 Wine brand · you 32.00 Food brand · you · cooper 92.00 BALANCES owes owed SUM 0.00 You −46.67 Brand +77.33 Cooper −30.66 ALWAYS SUMS TO ZERO NO APP TO JOIN
Fig. 1 — Receipt photo in, balances out

02 At the end

Say “settle up.” It’s done.

You get the shortest list of payments that makes everyone even — the exact minimum, not a guess. It’s just a list: no money moves through the skill. Pay each other however you already do.

Four balances settled in three payments Four people hold balances: You at plus 268.33, Brand at minus 241.67, Cooper at minus 215.66, and Doyle at plus 189.00. Six pairs among them could exchange money, shown as faint lines. Three of those lines are drawn solid: Brand pays You 241.67, Cooper pays You 26.66, and Cooper pays Doyle 189.00 — after which every balance is zero. SETTLEMENT 4 PEOPLE You +268.33 Y Brand −241.67 B C Cooper −215.66 D Doyle +189.00 SIX POSSIBLE PAIRS THREE PAYMENTS PAYMENTS 3 TOTAL Brand You 241.67 Cooper You 26.66 Cooper Doyle 189.00 EVERY BALANCE AT 0.00
Fig. 2 — Four balances, three payments

03 Install

One file, two ways in.

Download one zip. Unzip it for a coding agent, or upload it to the Claude or ChatGPT apps.

  1. A — A coding agent

    Unzip it into the skills folder your agent already reads.

    unzip split-expenses.zip \
  -d ~/.claude/skills/

  2. B — The Claude or ChatGPT app

    Upload the zip under Settings → Skills, on a plan with code execution. If Safari unzipped it for you, the zip itself is still in Downloads.

    Download the skill ZIP · 6 KB

Python 3.9 or newer. Nothing else to install or configure. Then just start talking.