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-monitor)<a href="https://agentmods.dev/skills/appsvortex/arness/arn-infra-monitor"><img src="https://agentmods.dev/badge/skills/appsvortex/arness/arn-infra-monitor/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-monitor"><img src="https://agentmods.dev/badge/skills/appsvortex/arness/arn-infra-monitor.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 | $0.00145 | $0.02992 |
| Opus 5.5 | $0.00058 | $0.01197 |
| Sonnet 5.5 | $0.00029 | $0.00598 |
| Haiku 4.5 | $0.00015 | $0.00299 |
Grade A, and why
arn-infra-monitor 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 — 310 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Arness Infra Monitor
Set up observability for deployed infrastructure: structured logging, metrics collection, and alerting. This skill recommends an observability stack based on the configured cloud provider, generates IaC for monitoring resources, and configures basic health-check-based alerts.
This skill focuses on initial monitoring setup and critical alerts. It does NOT create full monitoring dashboards (out of scope per spec). For ongoing monitoring and alerting customization, refer users to their provider's monitoring console.
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. Monitoring setup 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 -- for generating monitoring IaC
- Environments -- environment list for per-environment monitoring config
- Environments config -- path to
environments.md - Tooling manifest -- path to
tooling-manifest.json - Resource manifest -- path to
active-resources.jsonfor checking deployed resource state (if available from prior deployments) - Cost threshold -- for monitoring cost considerations
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 · 310 lines · 145 tokens per session scan A fe9cb18818be
arn-infra-monitor is a skill published in the GitHub repository AppsVortex/arness (33 stars, last pushed yesterday), licensed MIT. It adds 145 tokens to every session and 2,992 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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