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 jordanhubbard/agentos --skill sel4-platformgit clone --depth 1 https://github.com/jordanhubbard/agentosWrote 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/jordanhubbard/agentos/sel4-platform)<a href="https://agentmods.dev/skills/jordanhubbard/agentos/sel4-platform"><img src="https://agentmods.dev/badge/skills/jordanhubbard/agentos/sel4-platform/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/jordanhubbard/agentos/sel4-platform"><img src="https://agentmods.dev/badge/skills/jordanhubbard/agentos/sel4-platform.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 | $0.00000 | $0.00182 |
| Opus 5 | $0.00000 | $0.00091 |
| Sonnet 5 | $0.00000 | $0.00036 |
| Haiku 4.5 | $0.00000 | $0.00018 |
Grade A, and why
sel4-platform 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 today.
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
seL4 platform
You are composing agentOS on-target topology, not a Linux distro.
Invariants
- seL4 is the only kernel-mode code.
- Root task distributes caps, then idles. No policy there.
- PDs in
docs/TCB.mdmay own devices. Museum PDs must not be extended. - QEMU is hardware. Do not passthrough QEMU virtio-mmio into guests.
Forbidden
- Adding
oom_killer, POSIX spawn/vfs, or vibe-swap-as-NIC. - Documenting "rings 1–5".
- Python or another forbidden implementation language anywhere in the repository.
Helper
Run make gate to validate the generated topology and boot it on both
supported QEMU architectures. The topology authority remains generated C and
the documented TCB, with no rendered UI artifact.
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.
- today Changed · -2 lines d8f90d703428
- 6d ago First seen · 25 lines · 0 tokens per session scan A 4cf5c8afc3ed
sel4-platform is a skill published in the GitHub repository jordanhubbard/agentos (30 stars, last pushed today), licensed BSD-2-Clause. It costs nothing until one of its globs matches a file; then it loads 182 tokens. 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 2026-09-04.
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