founder-cfo Checked
Installation
Copy the prompt below and send it to your AI assistant (e.g. Claude Code) — it will follow the instructions and install automatically.
Install the "founder-cfo" skill by following the instructions at https://skill123.me/install/founder-cfo.
Run in your terminal — downloads and installs to ~/.claude/skills/.
curl -fsSL https://skill123.me/install/founder-cfo.sh | bash
Download the zip and extract it into your skills directory (e.g. ~/.claude/skills/), then restart your session.
⬇ Download v1.0.0 · 7 KBNot live-tested yet — this skill is rated on static analysis only.
About this skill
Your CFO. Builds the unit economics of a business before money is spent: what one unit earns after its direct costs, the real profit margin at the planned volume, the break-even point in units a day, year 1 month by month, the cash needed before it pays for itself, how long the startup spend takes to earn back, and what happens if the price drops, sales come in low or costs rise. Every number traces to an input the user can check. Use when the user says "find the profit margins", "do the numbers", "is this profitable", "break-even", "unit economics", "how much do I need to start", or "run the CFO".
founder-cfo
The person who asks "and what does that cost?" Margins decide whether a good idea
is a business. This skill finds them, with every number traceable to an input.
Tool in this folder:
python3 "${CLAUDE_SKILL_DIR}/unit_economics.py" founder/numbers.json --out founder/cfo.md
Documentation
Your CFO. Builds the unit economics of a business before money is spent: what one unit earns after its direct costs, the real profit margin at the planned volume, the break-even point in units a day, year 1 month by month, the cash needed before it pays for itself, how long the startup spend takes to earn back, and what happens if the price drops, sales come in low or costs rise. Every number traces to an input the user can check. Use when the user says "find the profit margins", "do the numbers", "is this profitable", "break-even", "unit economics", "how much do I need to start", or "run the CFO".
founder-cfo
The person who asks "and what does that cost?" Margins decide whether a good idea
is a business. This skill finds them, with every number traceable to an input.
Tool in this folder:
python3 "${CLAUDE_SKILL_DIR}/unit_economics.py" founder/numbers.json --out founder/cfo.md
Step 1: gather the inputs
Write founder/numbers.json (shape: example.json in this folder, a walk-in
matcha café). It needs:
| field | what goes in it |
| --- | --- |
| unit | what one sale is: a cup, an order, a client-month, a seat |
| price | price per unit before tax |
| variable | the cost of ONE unit: ingredients, packaging, shipping, card fees, per-sale commissions |
| fixed_monthly | what you pay every month regardless: rent, salaries, software, insurance |
| startup | one-off spend before opening: deposits, build-out, equipment, first inventory, launch ads |
| plan_per_day | the volume once it is up and running |
| ramp_per_day | 12 numbers: realistic volume in each month of year 1 |
| capacity_per_day | the most you can physically sell in a day, if there is a limit |
Where the numbers come from, in this order:
1. The user's own quotes, invoices, leases and supplier price lists.
2. Public prices the user can check (a supplier's price list, a landlord's listing,
a payment processor's published fees). Write the source next to the number in
founder/cfo-sources.md.
3. Your estimate, clearly marked as an estimate, with the reasoning. Never present
an estimate as a fact.
Ask the user for anything only they know (rent quoted, wages they will pay). Use the
price from founder/pricing.md or founder/pitch.md if those exist.
**The ramp is where plans lie.** Month 1 is almost never the plan volume. If the
buyer panel ran, use its buy rate and first-month purchases to sanity-check the
ramp (founder/panel/results.md), and say how you did it.
Step 2: run it
python3 "${CLAUDE_SKILL_DIR}/unit_economics.py" founder/numbers.json --out founder/cfo.md
View full documentation
It writes: the per-unit table and the contribution (what each sale leaves after
its own costs), fixed costs, the break-even in units a day, the profit margin at
the plan volume, year 1 month by month, the year 1 operating profit and the result
after the startup spend, the cash needed before it pays for itself, the month the
startup money is earned back, and a what-if table (price -10%, volume -20%, unit
costs +15%). It flags a price below variable cost, a break-even above capacity, a
losing year 1 and a payback beyond 12 months.
What-ifs without editing the file:
python3 "${CLAUDE_SKILL_DIR}/unit_economics.py" founder/numbers.json --price 7.00
python3 "${CLAUDE_SKILL_DIR}/unit_economics.py" founder/numbers.json --volume 0.8
Step 3: the CFO's note
Add a short section at the top of founder/cfo.md, in plain words:
- **The margin**: the profit margin at plan, and the contribution per unit.
- **The line to watch**: the one cost or assumption that moves the result most
(usually the ramp, rent or the price), with the what-if that proves it.
- **Cash**: how much money the founder needs before it pays for itself.
- **Three ways to improve the margin**, each with the number it changes and by how
much (run the what-if, do not guess).
- Whether the board's conditions about money (
founder/board.md) are met.
Rules
- Every number in your note comes from the tool's output or an input you can name.
- Revenue is before tax; say if the user's market adds sales tax on top.
- Not financial, tax or legal advice. Say once that an accountant should check the
structure, payroll costs and tax before money moves.
Output
founder/numbers.json, founder/cfo.md, founder/cfo-sources.md. Next:
/founder-plan uses these numbers for the verdict; /founder-pricing if the
margin is thin.
Score breakdown
Assessment methodology
Version history
Imported from Jakeschincariol/founder-skill@main