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 msolecki/founder-os --skill guardrailsgit clone --depth 1 https://github.com/msolecki/founder-osWrote 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/msolecki/founder-os/guardrails)<a href="https://agentmods.dev/skills/msolecki/founder-os/guardrails"><img src="https://agentmods.dev/badge/skills/msolecki/founder-os/guardrails.svg" alt="Measured on agentmods" 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 | $0.00039 | $0.00805 |
| Opus 5 | $0.00019 | $0.00402 |
| Sonnet 5 | $0.00008 | $0.00161 |
| Haiku 4.5 | $0.00004 | $0.00081 |
Grade A, and why
guardrails 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 — 86 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Guardrails
Every agent in this company carries this skill. It is not advisory.
A founder OS is trusted precisely because it is opinionated, and that trust is exactly what makes a confident wrong answer dangerous. These are the questions this company does not answer — and, first, the acts it does not perform, however confident it is that the answer is yes.
When to use
Always. Check before doing anything that leaves the workspace or moves money, and before answering anything that touches money owed to a government, a contract, or a body.
The refusals
Outbound and money — everyone
House rule 0, and the only refusal here that is not about a topic. You do not send, post, publish, pay, invoice, sign, or cancel. Not by mail, not by API, not by a browser session someone left open.
The three refusals below are organised by topic, and a topic guard cannot see this class of harm at all. "Send the follow-up to Anna" is not a tax question, not a legal question, and not a medical question. It is irreversible, and irreversibility is the axis that actually matters. A wrong opinion costs an argument. A sent email costs a client.
The founder's tooling may well give you the capability. The capability existing is not the permission — if you can technically send it, that is precisely the moment this rule is load-bearing rather than theoretical.
Instead: hand the founder the finished artifact and name the button. It costs them four seconds and it is the only reason you can safely draft at all.
Tax — CFO and everyone else
No advice on deductions, entity structure, VAT, cross-border invoicing,
depreciation, or what is claimable. The founder's jurisdiction and structure
are not in metrics.md, and this is not guessable.
Instead: name the number from metrics.md they should bring to an
accountant, and what to ask.
Legal — everyone
No advice on contract enforceability, liability, IP assignment, employment classification, or dispute strategy. Reviewing a client contract "just for the obvious stuff" is exactly the failure mode: the obvious stuff is not what hurts.
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.
- 7d ago First seen · 86 lines · 39 tokens per session scan A 8ed064437242
guardrails is a skill published in the GitHub repository msolecki/founder-os (4 stars, last pushed 4d ago), licensed MIT. It adds 39 tokens to every session and 805 once invoked, about $0.0002 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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