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-codeWrote 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-code-batch-simplify)<a href="https://agentmods.dev/skills/appsvortex/arness/arn-code-batch-simplify"><img src="https://agentmods.dev/badge/skills/appsvortex/arness/arn-code-batch-simplify/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-code-batch-simplify"><img src="https://agentmods.dev/badge/skills/appsvortex/arness/arn-code-batch-simplify.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 | $0.00151 | $0.04581 |
| Opus 5.5 | $0.00060 | $0.01832 |
| Sonnet 5.5 | $0.00030 | $0.00916 |
| Haiku 4.5 | $0.00015 | $0.00458 |
Grade A, and why
arn-code-batch-simplify 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 1mo ago.
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 — 380 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Arness Batch Simplify
Post-merge cross-feature quality pass that finds duplication and consolidation opportunities across independently implemented features. Uses the same 3-reviewer pattern as regular simplify but with cross-feature context so reviewers can identify duplicated utilities, inconsistent patterns, and shared logic that emerged from parallel development.
This is an execution skill. It runs in normal conversation (NOT plan mode).
Pipeline position:
arn-code-batch-merge -> **arn-code-batch-simplify** -> (optional: review-implementation -> document-project -> ship)
Prerequisites
If no ## Arness section exists in the project's CLAUDE.md, inform the user: "Arness is not configured for this project yet. Run /arn-implementing to get started — it will set everything up automatically." Do not proceed without it.
Workflow
Step 0: Ensure Configuration
Read ${CLAUDE_PLUGIN_ROOT}/skills/arn-code-ensure-config/references/step-0-fast-path.md and follow its instructions. Extract from ## Arness:
- Plans directory (default:
.arness/plans) - Code patterns path (default:
.arness) - Template path (default:
.arness/templates)
Hold these values for the remainder of the workflow.
Step 1: Load Pattern Documentation
Load pattern documentation from the code patterns directory:
code-patterns.md(required)testing-patterns.md(required)architecture.md(required)ui-patterns.md(if it exists)security-patterns.md(if it exists)
If any required pattern doc is missing, invoke the arn-code-codebase-analyzer agent to generate fresh analysis. If the analyzer is unavailable, suggest running /arn-implementing to get started.
Hold all loaded pattern documentation for use throughout the workflow.
Step 2: Collect Batch Scope
Scan the plans directory for CHANGE_RECORD.json files across all feature subdirectories:
- For each
CHANGE_RECORD.jsonfound, check:commitHashis populated (feature was committed)- The feature has been merged — check
gh pr viewifnextStepscontains a PR URL, or verify the feature branch was merged into main viagit branch --merged main
What ships with it
1 file 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.
- 1mo ago First seen · 380 lines · 151 tokens per session scan A 075be8dfdf2d
arn-code-batch-simplify is a skill published in the GitHub repository AppsVortex/arness (33 stars, last pushed 2mo ago), licensed MIT. It adds 151 tokens to every session and 4,581 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 2026-08-30.
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