agentOS is a library that lets software agents run inside an existing application backend, using WebAssembly and V8 isolates with controlled access to host resources. It is for developers building agent-powered backends who need embedded execution and permissions, while the catalogue entries provide skills and instructions for operating the framework.
Borrowing it
Nothing to install: this file belongs to rivet-dev/agentos. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/rivet-dev/agentos/main/.claude/skills/release-preview/SKILL.mdgit clone --depth 1 https://github.com/rivet-dev/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/rivet-dev/agentos/release-preview)<a href="https://agentmods.dev/skills/rivet-dev/agentos/release-preview"><img src="https://agentmods.dev/badge/skills/rivet-dev/agentos/release-preview/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/rivet-dev/agentos/release-preview"><img src="https://agentmods.dev/badge/skills/rivet-dev/agentos/release-preview.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 | $0.00029 | $0.00291 |
| Opus 5.5 | $0.00012 | $0.00116 |
| Sonnet 5.5 | $0.00006 | $0.00058 |
| Haiku 4.5 | $0.00003 | $0.00029 |
Grade A, and why
release-preview scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
AgentOS Release Preview
AgentOS previews are branch snapshots from this repository. The workflow builds debug artifacts and publishes npm packages under a sanitized branch dist-tag. No crates.io release, git tag, or GitHub release is created.
agentos is a generated mirror. Do not bump a agentos ref or cut a agentos preview by hand.
Procedure
- Push the AgentOS branch.
- Dispatch and watch:
just release-preview <agentos-branch>
run=$(gh run list -R rivet-dev/agentos --workflow=publish.yaml -L1 --json databaseId --jq '.[0].databaseId')
gh run watch -R rivet-dev/agentos "$run" --exit-status
- Install a preview with:
npm install @rivet-dev/agentos-core@<sanitized-branch>
Rules
- Release-preview is for previews only; releases use the
releaseskill. - All code changes belong in AgentOS. The agentos mirror is regenerated from AgentOS and follows the published AgentOS version.
- On failure:
gh run view <run> --log-failed, fix, re-dispatch, re-watch.
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.
- 2mo ago First seen · 38 lines · 29 tokens per session scan A 2f0ee562f660
release-preview is a skill published in the GitHub repository rivet-dev/agentos (4,851 stars, last pushed yesterday), licensed Apache-2.0. It adds 29 tokens to every session and 291 once invoked, about $0.0001 per session on Opus 5.5. 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 2026-08-30.
release-preview compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| release-previewrivet-dev/agentos | Skill | 4.9k | yesterday | Apache-2.0 | A | 29 | Claude Code |
| github-repo-managementmoltis-org/moltis | Skill | 2.9k | 14d ago | MIT | A | 47 | Claude Code, Codex |
| releasematrixorigin/memoria | Skill | 623 | 2d ago | Apache-2.0 | A | 27 | Claude Code, Codex |
| release-new-versionniki914/zafiro | Skill | 340 | 4d ago | MIT | A | 54 | Claude Code, Codex |
| playground-snapshot-releasemastra-ai/mastra | Skill | 29k | yesterday | none | A | 114 | Claude Code, Codex |
| pr-snapshot-releasemastra-ai/mastra | Skill | 29k | yesterday | none | A | 88 | Claude Code, Codex |
| parallel-pr-reviewsuyoumo/ClawProBench | Skill | 829 | 2mo ago | Apache-2.0 | A | 67 | Claude Code, Codex |