Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add impactbrussels/FounderOS --skill runway-and-unit-economicsgit clone --depth 1 https://github.com/impactbrussels/FounderOSWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/impactbrussels/founderos/runway-and-unit-economics)<a href="https://agentmods.dev/skills/impactbrussels/founderos/runway-and-unit-economics"><img src="https://agentmods.dev/badge/skills/impactbrussels/founderos/runway-and-unit-economics/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/impactbrussels/founderos/runway-and-unit-economics"><img src="https://agentmods.dev/badge/skills/impactbrussels/founderos/runway-and-unit-economics.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00124 | $0.01432 |
| Opus 5 | $0.00062 | $0.00716 |
| Sonnet 5 | $0.00025 | $0.00286 |
| Haiku 4.5 | $0.00012 | $0.00143 |
Grade A, and why
runway-and-unit-economics scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 96 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Runway and Unit Economics
This is finance education, not financial advice. It teaches you to build and read a simple model. It is not accounting, tax, or investment advice. Numbers below are rules-of-thumb to sanity-check your own figures - not targets, guarantees, or laws. For anything that touches taxes, statutory reporting, or fundraising terms, confirm with a qualified accountant or financial adviser in your jurisdiction.
First-time founders die two ways with money: they run out of cash sooner than they think, or they scale a business that loses money on every customer. Both are invisible until it's too late - unless you have a one-page model. This skill builds that model: how long your cash lasts (runway), how fast you burn it, and whether each customer makes or loses you money (unit economics). The goal is a number you can defend and one lever to pull.
The method
Built on the Founder OS scaffold (High tier). Full templates, formulas, and benchmarks in references/unit-economics.md.
Step 1 - List the cash, in and out (research before asserting)
Pull actuals, not hopes. From your bank and invoices, list every monthly cash in (revenue actually collected, not booked) and every cash out (salaries, contractors, tools, rent, ads, fees). Use real numbers from the last 1-3 months. If you're guessing a line, mark it as an assumption - a model built on wishes lies to you.
Step 2 - Compute burn and runway
- Net monthly burn = cash out − cash in (if negative, you're burning; if positive, default-alive).
- Runway (months) = current cash balance ÷ net monthly burn.
Write the runway number in weeks if it's under ~6 months - it focuses the mind. This is the single most important number a pre-profit founder owns. Re-check it monthly.
Step 3 - Define the unit, then compute its economics
Pick the unit that the business scales on (one customer, one subscription, one order). For that unit, compute (definitions and formulas in the reference):
- CAC - fully-loaded cost to acquire one paying customer (ad spend + sales + the time it really takes).
- Contribution margin - revenue per unit minus the variable cost to serve it.
- LTV - contribution margin × how long they stay (be conservative on lifetime).
- LTV:CAC ratio and CAC payback period (months to earn back acquisition cost).
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 11d ago First seen · 96 lines · 124 tokens per session scan A e571e012aec1
runway-and-unit-economics is a skill published in the GitHub repository impactbrussels/FounderOS (2 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 124 tokens to every session and 1,432 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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