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-change-plan)<a href="https://agentmods.dev/skills/appsvortex/arness/arn-infra-change-plan"><img src="https://agentmods.dev/badge/skills/appsvortex/arness/arn-infra-change-plan/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-change-plan"><img src="https://agentmods.dev/badge/skills/appsvortex/arness/arn-infra-change-plan.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 | $0.00105 | $0.02435 |
| Opus 5.5 | $0.00042 | $0.00974 |
| Sonnet 5.5 | $0.00021 | $0.00487 |
| Haiku 4.5 | $0.00011 | $0.00244 |
Grade B, and why
arn-infra-change-plan scanned grade B with 1 finding 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.
Asks the agent to reveal its instructionsmediumSystem prompt leakage
Directions to print, repeat or translate the system prompt extract configuration the operator did not intend to expose.
--- OUTPUT INSTRUCTIONS --- How it starts
The opening of the file, as written. The whole thing — 211 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Arness Infra Change Plan
Generate a phased implementation plan from an infrastructure change specification by invoking the arn-infra-change-planner agent. The plan is written to disk as a PLAN_PREVIEW file, presented to the user for review, and iteratively refined based on feedback until approved. The approved plan then feeds into /arn-infra-save-plan for structuring into phases, tasks, and reports.
This skill plans in infrastructure terms -- phases are ordered by provisioning dependency, blast radius classification, rollback checkpoint placement, and environment promotion gates -- not by application development concepts.
Pipeline position: arn-infra-init -> arn-infra-change-spec -> [arn-infra-change-plan] -> arn-infra-save-plan -> arn-infra-execute-change -> arn-infra-review-change -> arn-infra-document-change
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. Change planning is not available until infrastructure is fully configured. Run /arn-infra-assess to un-defer." Stop.
Extract:
- Infra specs directory -- path where INFRA_CHANGE_*.md specs are stored (default:
.arness/infra-specs) - Infra plans directory -- path where plans are stored (default:
.arness/infra-plans) - 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 -- which cloud providers are configured
- Environments -- which environments exist and their promotion order
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 · 211 lines · 105 tokens per session scan B b92e1fddb5e5
arn-infra-change-plan is a skill published in the GitHub repository AppsVortex/arness (33 stars, last pushed yesterday), licensed MIT. It adds 105 tokens to every session and 2,435 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it B with 1 finding (asks the agent to reveal its instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-10-25.
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