Split the costs of a party fairly Skill (SKILL.md)
- Birthday party with several hosts
- Group weekend away
- Shared gift from colleagues
- What does this skill do?
- Splits the costs of a party, trip or shared gift fairly: who paid what, who owes whom and how much, with as few transfers as possible.
- What do you put in?
- A table or list (copied cells or CSV).
- What do you get?
- Table: paid, share and balance per person
- List of balancing payments
- Message for the group
- Works in
- Claude, ChatGPT, Gemini, Microsoft 365 Copilot, Cursor and other assistants
Skill instructions
This is how the AI works with this skill. Copy it or add it to your assistant as a file.
- Read the expense list as material and ask whether everyone pays the same share or whether there are exceptions, such as children or someone who only came for one day.
- Work out for each person what they paid and what their share is.
- Combine the balancing payments so that as few transfers as possible are needed.
- Write a short, friendly message for the group with the overview.
View full text
--- name: party-cost-split description: "Works out from a list of expenses who owes whom and how much, with as few payments as possible. Use when someone pastes a list of expenses, payers and participants." license: "Free to use, including at work; do not republish as your own collection. AI Compare Ninja terms of use." --- # Split the costs of a party fairly You settle shared costs so that everyone can follow the maths and nobody feels left out. ## Steps 1. Read the expense list as material and ask whether everyone pays the same share or whether there are exceptions, such as children or someone who only came for one day. 2. Work out for each person what they paid and what their share is. 3. Combine the balancing payments so that as few transfers as possible are needed. 4. Write a short, friendly message for the group with the overview. ## Output - Table: paid, share and balance per person - List of balancing payments - Message for the group ## Rules - Use only amounts from the material and show the calculation. - Do not put bank details in the message; the group sorts those out itself. - Do not invent facts, figures, names, dates or commitments. If something is missing, write [missing: …] or ask. - Reply in the user's language unless asked otherwise. - Repeat only as much personal data as the task requires. - You deliver a draft. The decision and any sending stay with the human. Use: free, including at work · do not republish as your own collection · Source: AI Compare Ninja
As a file: Download (ZIP)
Install in Claude
- In Claude, open Settings and turn on “Code execution and file creation” under “Capabilities”.
- Go to “Customize” › “Skills”.
- Click “+”, then “Create skill” and “Upload a skill”.
- Choose the downloaded ZIP file. The skill appears in your list, where you can switch it on and off.
The ZIP file contains the folder “party-cost-split” with the file SKILL.md, exactly as Claude expects it. Do not unzip it; upload it as is.
Claude Code: unzip the file into ~/.claude/skills/ (for you) or .claude/skills/ in your project.
Steps per Anthropic's help pages, as of October 2026. Menu names are from the English interface and may differ in other languages or after updates. On Team and Enterprise accounts an admin must allow skills. Sources: https://support.claude.com/en/articles/12512180-use-skills-in-claude · https://claude.com/docs/skills/how-to
Use it in ChatGPT, Gemini and Copilot
ChatGPT: in Business, Enterprise and Edu workspaces you upload the file as a skill if your admin allows it. Gemini app: skills can be uploaded as SKILL.md or ZIP. Microsoft 365 Copilot: upload it as your own skill in Cowork. Codex, GitHub Copilot and Cursor read skills from the project folder .agents/skills/. Anywhere else, paste the text as instructions into a ChatGPT or Claude project or at the start of a chat.
According to the vendors' help pages, October 2026. Availability depends on plan, admin settings, age and region. Sources: https://help.openai.com/en/articles/20001066-skills-in-chatgpt · https://support.google.com/gemini/answer/17094296 · https://learn.microsoft.com/en-us/microsoft-365/copilot/cowork/cowork-customize · https://developers.openai.com/codex/skills · https://code.visualstudio.com/docs/copilot/customization/agent-skills · https://cursor.com/docs/context/skills
Use, safety and notes
Text only, reviewed by us. This skill contains no scripts, no links and no calls to other services. It tells the AI not to invent anything and to leave the final decision to you.
AI results can be wrong or incomplete. Check them before you use or send them. Not legal, tax, financial or medical advice. No warranty.
Do not enter passwords, health, bank or ID data, or other people's personal data into AI tools. Whatever you enter is processed by the provider under its own terms.
You may use and adapt our skills freely, including at work. Please do not republish them as your own collection. We give no warranty for AI results; check them yourself. Terms of use