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 magnus919/agent-skills --skill yc-default-alive-calculatorgit clone --depth 1 https://github.com/magnus919/agent-skillsWrote 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/magnus919/agent-skills/yc-default-alive-calculator)<a href="https://agentmods.dev/skills/magnus919/agent-skills/yc-default-alive-calculator"><img src="https://agentmods.dev/badge/skills/magnus919/agent-skills/yc-default-alive-calculator/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/magnus919/agent-skills/yc-default-alive-calculator"><img src="https://agentmods.dev/badge/skills/magnus919/agent-skills/yc-default-alive-calculator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00054 | $0.02018 |
| Opus 5 | $0.00027 | $0.01009 |
| Sonnet 5 | $0.00011 | $0.00404 |
| Haiku 4.5 | $0.00005 | $0.00202 |
Grade A, and why
yc-default-alive-calculator 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 7d 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 — 207 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Default Alive / Default Dead Calculator
A startup is "default alive" if its current revenue trajectory will reach profitability before it runs out of cash — without additional funding. It is "default dead" if it will run out of money first. This is the single most important financial diagnostic Paul Graham developed at Y Combinator.
This is not a fundraising model. It's a reality check. The answer determines whether fundraising is optional or existential.
When to Load
| Trigger | Example |
|---|---|
| "Am I default alive?" | Founder asking about runway |
| "How much runway do I have?" | Financial planning |
| "Should I raise money?" | Strategic decision |
| "What's my burn multiple?" | Investor-ready metrics |
| "How long until we break even?" | Trajectory check |
| "Default alive/dead analysis" | Explicit framework request |
When Not to Use
- Detailed financial planning. This is a diagnostic, not a budget. It projects one growth curve with fixed assumptions; it does not model hiring plans, contract timing, seasonality, or capital expenditures. Use a proper financial model for those.
- Fundraising valuation. The verdict tells you whether raising money is existential; it does not compute a valuation, cap table, or round size.
- Cost structures the default assumptions don't describe. The model splits burn into fixed and variable components (default 70/30). Hardware, R&D, or manufacturing companies with very different cost structures will get a misleading projection.
- Unknown or unstable growth. The model assumes a steady monthly growth rate with a small decay. A company in launch mode or product-market-fit search does not produce a meaningful projection.
- As the only input to a board decision. Treat the verdict as a conversation starter with your CFO or accountant, not as financial advice.
How to Use
Quick Answer (No Script)
For a quick check without running the calculator, use the simplified heuristic:
Burn Multiple = Net Burn / Net New ARR
What ships with it
5 files 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.
- 7d ago First seen · 207 lines · 54 tokens per session scan A 71f0e2ea5f07
yc-default-alive-calculator is a skill published in the GitHub repository magnus919/agent-skills (76 stars, last pushed yesterday), licensed MIT. It adds 54 tokens to every session and 2,018 once invoked, about $0.0003 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 2026-09-05.
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