Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add AppsVortex/arness/plugin install arn-infraWrote 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/appsvortex/arness/arn-infra-env)<a href="https://agentmods.dev/skills/appsvortex/arness/arn-infra-env"><img src="https://agentmods.dev/badge/skills/appsvortex/arness/arn-infra-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/appsvortex/arness/arn-infra-env"><img src="https://agentmods.dev/badge/skills/appsvortex/arness/arn-infra-env.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00125 | $0.02745 |
| Opus 5.5 | $0.00050 | $0.01098 |
| Sonnet 5.5 | $0.00025 | $0.00549 |
| Haiku 4.5 | $0.00013 | $0.00275 |
Grade A, and why
arn-infra-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 yesterday.
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 — 288 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Arness Infra Env
Configure and manage infrastructure environments (dev, staging, production) with provider-specific isolation strategies, environment-specific variable overrides, resource sizing, and promotion rules. This skill generates environment-specific IaC configurations and updates the environment promotion pipeline.
This skill is expertise-adaptive: beginner users get simplified environment setups with opinionated defaults, while expert users have full control over isolation strategies and promotion configurations.
Prerequisites
Read ## Arness from the project's CLAUDE.md. If no ## Arness section exists or Arness Infra fields are missing, inform the user: "Arness Infra is not configured for this project yet. Run /arn-infra-wizard to get started — it will set everything up automatically." Do not proceed without it.
Check the Deferred field. If Deferred: yes, inform the user: "Infrastructure is in deferred mode. Environment management is not available until infrastructure is fully configured. Run /arn-infra-assess to un-defer." Stop.
Extract:
- Experience level -- derived from user profile. Read
~/.arness/user-profile.yaml(or.claude/arness-profile.local.mdif it exists — project override takes precedence). Apply the experience derivation mapping from${CLAUDE_PLUGIN_ROOT}/skills/arn-infra-ensure-config/references/experience-derivation.md. If no profile exists, check for legacyExperience levelin## Arnessas fallback. - Providers -- cloud providers in use
- Providers config -- path to
providers.mdfor per-provider details - Default IaC tool -- the default IaC tool
- Environments -- current environment list in promotion order
- Environments config -- path to
environments.md
Workflow
Step 1: Read Current Environment Configuration
Read the environment configuration:
Read <environments-config-path>
Extract the current state:
- Promotion pipeline order
- Per-environment settings (auto-deploy, approval required, last deployed, pending changes)
What ships with it
2 files 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.
- yesterday First seen · 288 lines · 125 tokens per session scan A 1485944e82b8
arn-infra-env is a skill published in the GitHub repository AppsVortex/arness (33 stars, last pushed yesterday), licensed MIT. It adds 125 tokens to every session and 2,745 once invoked, about $0.0005 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 2026-10-25.
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