Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/appsvortex/arness/arn-code-standardnpx skills add AppsVortex/arness --skill arn-code-standardgit clone --depth 1 https://github.com/AppsVortex/arnessWhat 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 | $0.00115 | $0.07277 |
| Opus 5 | $0.00057 | $0.03639 |
| Sonnet 5 | $0.00023 | $0.01455 |
| Haiku 4.5 | $0.00012 | $0.00728 |
Grade A, and why
arn-code-standard 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 — 552 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Arness Standard
Implement medium-complexity features and enhancements through a mid-ceremony, pattern-aware workflow: spec-lite generation, structured plan, task-tracked execution, verification, review-lite, and unified change record -- all in a single session. Every standard implementation produces three artifacts in <plans-dir>/STANDARD_<name>/: a plan (STANDARD_<name>.md), a report (STANDARD_REPORT.json), and a change record (CHANGE_RECORD.json), giving robust auditability with less overhead than the full thorough pipeline.
This skill follows the same execution model as arn-code-swift's moderate path but adds a Spec-Lite front-end (lightweight architectural specification) and a unified CHANGE_RECORD.json envelope for downstream consumption.
This is an execution skill. It runs in normal conversation (NOT plan mode).
Step 0: Ensure Configuration
Read ${CLAUDE_PLUGIN_ROOT}/skills/arn-code-ensure-config/references/step-0-fast-path.md and follow its instructions. This guarantees a user profile exists and ## Arness is configured with Arness Code fields before proceeding.
Pipeline Position
arn-code-standard (this skill)
============================
For medium-complexity changes
routed here by the scope router
Entry: arn-planning (scope router) --> standard tier
|
v
arn-implementing --> arn-code-standard
|
v
Spec-Lite --> Plan --> Execute --> Report --> Review-Lite --> Change Record --> Ship
|
v
<plans-dir>/STANDARD_<name>/
+-- STANDARD_<name>.md (plan with spec-lite)
+-- STANDARD_REPORT.json (execution report)
+-- CHANGE_RECORD.json (unified envelope)
Workflow
Step 1: Capture and Load Context
- Accept the user's description. This can be anything from a sentence ("add rate limiting to /api/users") to detailed requirements. If the user already provided the description in their trigger message, use that directly without asking again.
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 · 552 lines · 115 tokens per session scan A cd53cb26030a
arn-code-standard is a skill published in the GitHub repository AppsVortex/arness (33 stars, last pushed 1mo ago), licensed MIT. It adds 115 tokens to every session and 7,277 once invoked, about $0.0006 per session on Opus 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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