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 agentmods add commands/arcassystems/founderos/os-evolvegit clone --depth 1 https://github.com/ARCASSystems/FounderOSWhat 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 | $0.00061 | $0.00311 |
| Opus 5 | $0.00030 | $0.00156 |
| Sonnet 5 | $0.00012 | $0.00062 |
| Haiku 4.5 | $0.00006 | $0.00031 |
Grade A, and why
os-evolve 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 2d 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.
What it actually says
Founder OS evolve
Run the os-evolve skill at skills/os-evolve/SKILL.md end to end.
Procedure
- Read
skills/os-evolve/SKILL.md. - Pass
$ARGUMENTSas the source file to evolve from. If empty, use the newest audit or plan inplans/. Ifplans/is empty or missing, say so and build the gap list from flags, quarantine, and the last cycle only. - Write exactly one file:
plans/os-evolve-<today>.md. Createplans/if it does not exist. - Report the path, the counts, and the one prompt to run first.
Rules
- Never execute the prompts this run just wrote. Planning and executing are separate sessions.
- Never edit
CLAUDE.md,rules/, or any User Layer file. - No gap without evidence. A hunch goes in the kill column.
- No em dashes or en dashes. No banned words.
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.
- 2d ago First seen · 24 lines · 61 tokens per session scan A 7fed379bb6dd
os-evolve is a command published in the GitHub repository ARCASSystems/FounderOS (5 stars, last pushed 18d ago), licensed MIT. It adds 61 tokens to every session and 311 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 2026-08-31.
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