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-save-plan)<a href="https://agentmods.dev/skills/appsvortex/arness/arn-infra-save-plan"><img src="https://agentmods.dev/badge/skills/appsvortex/arness/arn-infra-save-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-save-plan"><img src="https://agentmods.dev/badge/skills/appsvortex/arness/arn-infra-save-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 | $0.02596 |
| Opus 5.5 | $0.00042 | $0.01038 |
| Sonnet 5.5 | $0.00021 | $0.00519 |
| Haiku 4.5 | $0.00011 | $0.00260 |
Grade A, and why
arn-infra-save-plan 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 — 271 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Arness Infra Save Plan
Convert a PLAN_PREVIEW_INFRA_*.md plan preview into a structured project directory with infrastructure-specific INTRODUCTION.md, per-phase PHASE_N_PLAN.md files, TASKS.md, report templates, and a PROGRESS_TRACKER.json for execution tracking. This is the bridge between change-plan (which produces the preview) and execute-change (which consumes the structured project).
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. Plan structuring is not available until infrastructure is fully configured. Run /arn-infra-assess to un-defer." Stop.
Extract:
- Infra plans directory -- where structured plan projects live (e.g.,
.arness/infra-plans) - Infra report templates -- which report template set to use (default:
default) - Infra template path -- where to copy report templates for the project (e.g.,
.arness/infra-templates) - Infra template version -- current template version for checksum tracking
- 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.
If Infra plans directory is not configured, stop and instruct the user: "Infra plans directory is not configured. Run /arn-infra-init to set up infrastructure pipeline configuration."
What ships with it
5 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 · 271 lines · 105 tokens per session scan A e92873d13a4d
arn-infra-save-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 2,596 once invoked, about $0.0004 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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