Borrowing it
Nothing to install: this file belongs to open-mercato/cezar. 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/open-mercato/cezar/main/.ai/skills/om-prepare-test-env/SKILL.mdgit clone --depth 1 https://github.com/open-mercato/cezarWrote 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/open-mercato/cezar/om-prepare-test-env)<a href="https://agentmods.dev/skills/open-mercato/cezar/om-prepare-test-env"><img src="https://agentmods.dev/badge/skills/open-mercato/cezar/om-prepare-test-env/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/open-mercato/cezar/om-prepare-test-env"><img src="https://agentmods.dev/badge/skills/open-mercato/cezar/om-prepare-test-env.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 | $0.00214 |
| Opus 5 | $0.00000 | $0.00107 |
| Sonnet 5 | $0.00000 | $0.00043 |
| Haiku 4.5 | $0.00000 | $0.00021 |
Grade A, and why
om-prepare-test-env 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 9d 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
Repository test-environment notes
- Launch the built cezar server through
.ai/scripts/test-env-up.sh; its app process must usenohupwith stdin detached so it survives non-interactive bootstrap shells. This prevents a descriptor from reporting a server that is terminated as soon as the bootstrap command exits. - Fresh worktrees have no workspace links or runtime dependencies. The generated entrypoint must run the compound
npm ci && npm run buildchain throughsh -c, includepackages/contract/srcin its build fingerprint, and requirenode_modules/zod/package.jsonas a cache artifact. This prevents@open-mercato/cezar-contractfrom resolving as missing/unknown duringtscand prevents a cached build from starting without runtime dependencies. Do not requirepackages/api-client/dist: the web build aliases that workspace to source and the root build does not emit that directory. RunCEZ_AGENT_MODELS_LOCKED=1 sh .ai/scripts/test-env-up.sh --forcefor locked-model QA.
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.
- 9d ago First seen · 5 lines · 0 tokens per session scan A 91787ec97710
om-prepare-test-env is a skill published in the GitHub repository open-mercato/cezar (183 stars, last pushed yesterday), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 214 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 2026-08-30.
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