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-init)<a href="https://agentmods.dev/skills/appsvortex/arness/arn-infra-init"><img src="https://agentmods.dev/badge/skills/appsvortex/arness/arn-infra-init/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-init"><img src="https://agentmods.dev/badge/skills/appsvortex/arness/arn-infra-init.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 | $0.00147 | $0.05877 |
| Opus 5.5 | $0.00059 | $0.02351 |
| Sonnet 5.5 | $0.00029 | $0.01175 |
| Haiku 4.5 | $0.00015 | $0.00588 |
Grade A, and why
arn-infra-init 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 — 450 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Arness Infra Init
Configure the Arness Infra plugin for a project by selecting cloud providers and IaC tools, establishing environment strategy, and persisting configuration to CLAUDE.md. This is optional — Arness Infra auto-configures with sensible defaults on first skill invocation. Use this to configure providers, environments, IaC tools, CI/CD platform, or review your current settings.
This skill does NOT require Arness Core. It writes infra configuration fields into the shared ## Arness section in CLAUDE.md, preserving any existing fields from arn-code or arn-spark. If no ## Arness section exists, it creates one.
The infra configuration written by this skill contains up to 25 fields that govern the behavior of all downstream infrastructure skills and agents. The configuration is expertise-adaptive: experience level is derived from your user profile (set during first Arness skill invocation) and governs conversational tone and recommendations. Beginner users get opinionated PaaS recommendations, while expert users have full control over provider and IaC tool selection.
Note: Experience level is now derived from your user profile and is no longer stored in
## Arnessconfig. The derivation mapping is at${CLAUDE_PLUGIN_ROOT}/skills/arn-infra-ensure-config/references/experience-derivation.md. If no profile exists when init runs, the welcome flow in ensure-config runs first to create one.
Workflow
Step 0: Existing Infrastructure Detection
Before any user interaction, scan the project for existing infrastructure artifacts.
Read the local override or plugin default for
existing-infra-detection.md.
Scan for:
- IaC files:
*.tf,*.hcl,Pulumi.*,cdk.json,*.bicep - Container configs:
Dockerfile,docker-compose.*,.dockerignore - CI/CD pipelines:
.github/workflows/,.gitlab-ci.yml,bitbucket-pipelines.yml - Platform configs:
fly.toml,railway.json,vercel.json,render.yaml,netlify.toml - Kubernetes:
kubernetes/,k8s/,helm/,Chart.yaml - Cloud-specific:
.aws/,gcloud/,azure/
What ships with it
9 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.
- references/agent-models-presets/all-opus.md 341 B
- references/agent-models-presets/balanced.md 349 B
- references/config-schema.md 17 KB
- references/existing-infra-detection.md 6.1 KB
- references/iac-tool-guide.md 7.4 KB
- references/infra-labels.md 6.0 KB
- references/provider-overview.md 6.0 KB
- references/recommendation-matrix.md 5.6 KB
- references/reference-override-protocol.md 6.4 KB
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 · 450 lines · 147 tokens per session scan A 2f75c291e468
arn-infra-init is a skill published in the GitHub repository AppsVortex/arness (33 stars, last pushed yesterday), licensed MIT. It adds 147 tokens to every session and 5,877 once invoked, about $0.0006 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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